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Cosmic Vision
Cosmic Vision
Cosmic Vision
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Cosmic Vision is the third campaign of space science and space exploration missions in the Science Programme of the European Space Agency (ESA). Formulated in 2005 as Cosmic Vision: Space Science for Europe 2015–2025, the campaign succeeded the Horizon 2000 Plus campaign and envisioned a number of missions in the fields of astronomy and solar system exploration beyond 2015. Ten missions across four funding categories are planned to be launched under Cosmic Vision, with the first being CHEOPS in December 2019. A mission to the Galilean moons (JUICE), the first deep space mission with an opportunistic target (Comet Interceptor), and one of the first gravitational-wave space observatories (LISA), are planned for launch as part of the Cosmic Vision campaign.

History

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The initial call of ideas and concepts was launched in 2004 with a subsequent workshop held in Paris to define more fully the themes of the Vision under the broader headings of Astronomy and Astrophysics, Solar System Exploration and Fundamental Physics.[1]

By early 2006, the formulation for a 10-year plan based around 4 key questions emerged:

In March 2007, a call for mission ideas was formally released, which yielded in 19 astrophysics, 12 fundamental physics and 19 Solar System mission proposals.

In March 2012, ESA announced it had begun working on a series of small class (S-class) science missions. The first winning S-class concept is set to receive 50 million euros (£42m) and will be readied for launch in 2017.[2]

Missions

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Small class

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Small class missions (S-class) are intended to have a cost to ESA not exceeding 50 million euros. A first call for mission proposals was issued in March 2012.[3] Approximately 70 letters of Intent were received.[4] In October 2012 the first S-class mission was selected.[5] The current list of S-class missions include the following:

  • S1, CHEOPS, to measure known exoplanets' size by photometry; launched on 18 December 2019.[6]
  • S2, SMILE, a joint mission between ESA and the Chinese Academy of Sciences to study the interaction between Earth's magnetosphere and the solar wind. SMILE was selected in June 2015 from thirteen competing proposals.[7] Its launch is planned for the spring of 2026.[8]

Medium class

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Medium class (M-class) projects are relatively stand-alone projects and have a price cap of approximately 500 million euros. The first two M-class missions, M1 and M2, were selected in October 2011.[9] The M6 mission opportunity was cancelled in 2019 due to budgetary pressures.[10]

  • M1, Solar Orbiter, a heliophysics mission to make close-up observations of the Sun; launched on 10 February 2020.[11]
  • M2, Euclid, a visible to near-infrared space telescope to study dark energy and dark matter; launched on 1 July 2023.[12][13]
  • M3, PLATO, a mission to search for exoplanets and measure stellar oscillations. Selected on 19 February 2014, its launch is planned for 2026.[14] Other competing concepts that were studied included EChO, LOFT, MarcoPolo-R, and STE-QUEST.[15]
  • M4, ARIEL (Atmospheric Remote-Sensing Infrared Exoplanet Large-survey), a space observatory which will observe transits of nearby exoplanets to determine their chemical composition and physical conditions. The mission was selected by ESA on 20 March 2018 as the fourth medium-class science mission, to be launched in 2029.[16][17] After a preliminary culling of proposals in March 2015, a short list of three mission proposals selected for further study was announced on 4 June 2015.[18][19][20] The shortlist included the following two proposals: THOR (Turbulence Heating ObserveR) which would address a fundamental problem in space plasma physics concerned with the heating of plasma and the subsequent dissipation of energy;[18] and XIPE (X-ray Imaging Polarimetry Explorer) which would study X-ray emissions from high-energy sources such as supernovas, galaxy jets, black holes and neutron stars, to discover more about the behaviour of matter under extreme conditions.[18]
  • M5, EnVision, a mission to conduct high-resolution radar-mapping of select regions of the surface of Venus, as well as conduct atmospheric studies. The mission was selected in June 2021 and will launch in 2031.[21] The call for M5 mission proposals was announced in April 2016. In May 2018, a shortlist of three candidate missions was announced, with the other two proposals being: SPICA (SPace Infrared telescope for Cosmology and Astrophysics), a far-infrared observatory; and THESEUS (Transient High-Energy Sky and Early Universe Surveyor), a space telescope to detect distant gamma-ray bursts.[22] In October 2020, ESA announced that SPICA was no longer being considered as a candidate for the M5 mission.[23]
  • The M7 mission opportunity is currently being competed. In November 2022, five candidate missions were selected for further study: CALICO, HAYDN, M-MATISSE, Plasma Observatory, and THESEUS (M5 candidate).[24] In 2023, three candidate missions were under study: M-MATISSE, Plasma Observatory, and Theseus.[25]

Large class

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Originally it was intended that Large class (L-class) projects were to be carried out in collaboration with other partners and should have an ESA cost not exceeding 900 million euros. However, in April 2011 it became clear that budget pressures in the US meant that an expected collaboration with NASA on the L1 mission would not be practical; so the down-selection was delayed and the missions re-scoped on the assumption of ESA lead with some limited international participation.[26]

Three L-class missions have been selected:

  • L1, JUICE (Jupiter Icy Moon Explorer), a mission to the Jupiter system (with heritage from Laplace); launched on 14 April 2023.[27][28]
  • L2, Athena (Advanced Telescope for High Energy Astrophysics), an X-ray observatory with a launch planned for 2035.[29] In 2023, it was rescoped as NewAthena, with launch planned in 2037.[25]
  • L3, LISA (Laser Interferometer Space Antenna), a space mission concept designed to detect and accurately measure gravitational waves at lower frequencies than Earth-bound detectors.[30] Its launch is planned for 2035.[31]

Fast class

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At the ESA Science Programme Committee (SPC) Workshop on 16 May 2018, the creation of a series of special opportunity Fast class (F-class) missions was proposed. These F-missions would be jointly launched alongside each M-class mission starting from M4, and would focus on "innovative implementation" in order to broaden the range of scientific topics covered by the mission. The inclusion of F-class missions into the Cosmic Vision program would require a significant increase of the science budget, to be discussed in future meetings.[32]

Two F-class missions have been selected:

  • F1, Comet Interceptor, a mission to study a long-period comet or an interstellar object (which will be determined after the launch), launching as a secondary payload together with M4, ARIEL in 2029.[16]
  • F2, ARRAKIHS (Analysis of Resolved Remnants of Accreted galaxies as a Key Instrument for Halo Surveys), a mission to survey one hundred nearby galaxies and their surroundings to investigate the development of dwarf galaxies and stellar streams; launch planned for the early 2030s.[33]

Timeline

[edit]
Laser Interferometer Space AntennaEnVision (spacecraft)Advanced Telescope for High Energy AstrophysicsComet InterceptorARIELPLATO (spacecraft)SMILE (spacecraft)Euclid (spacecraft)Jupiter Icy Moons ExplorerSolar OrbiterCHEOPSBepiColomboLISA PathfinderGaia (spacecraft)Planck (spacecraft)Herschel Space ObservatoryRosetta (spacecraft)INTEGRALCluster II (spacecraft)XMM-NewtonHuygens (spacecraft)Cluster (spacecraft)Solar and Heliospheric Observatory

Missions of opportunity

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Occasionally ESA makes contributions to space missions led by another space agency. These missions include:[34]

  • Hinode – X-ray space telescope leading by JAXA, launched in 2006
  • IRIS – solar space spectrograph leading by NASA, launched in 2013
  • Microscope – microsatellite for studying free fall leading by CNES, active in 2016–2018
  • XRISM – X-ray space telescope leading by JAXA, launched in 2023
  • ExoMars – a series of Mars probes in collaboration with Roscosmos, an orbiter operational since 2017, a rover to be launched in late 2020s
  • Einstein Probe – a space mission dedicated to time-domain high-energy astrophysics leading by Chinese Academy of Sciences, launched in 2024
  • PROBA-3 – space technology testing spacecraft, launched in 2024
  • MMX – a sample-return Mars' moons probe leading by JAXA, to be launched in 2026
  • Nancy Grace Roman Space Telescope – a space telescope led by NASA, to be launched in 2027

A contribution to SPICA (Space Infrared Telescope for Cosmology and Astrophysics), a Japanese mission was evaluated as a mission of opportunity within the Cosmic Vision, but is no longer considered within that framework.[35] It was one of the finalists being considered for M5.

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Cosmic Vision

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Cosmic Vision 2015–2025 is the European Space Agency's (ESA) current long-term planning framework for its Scientific Programme, guiding the selection and development of space science missions from 2015 to 2025. Established in 2005 following a broad consultation process, it builds on previous cycles like Horizon 2000 (1984) and Horizon 2000 Plus (1994–1995), emphasizing innovative missions to address profound questions about the while fostering international collaborations. The programme allocates resources across large (L-class), medium (M-class), small (S-class), and fast (F-class) mission categories to balance ambitious projects with more agile, cost-effective explorations. At its core, Cosmic Vision is organized around four scientific themes that encapsulate humanity's quest to understand the : (1) what are the conditions for formation and the of ; (2) how does the Solar System work; (3) what are the fundamental physical laws of the ; and (4) how did the originate, and what role is played by and . These themes drive mission designs that span , studies, , cosmology, and fundamental physics, with a strong emphasis on technological innovation and data-driven discoveries. By 2025, the programme has enabled launches of key missions and advanced preparations for others, marking a pivotal era in Europe's contributions to space amid transitions to the subsequent Voyage 2050 framework. Notable missions selected under Cosmic Vision include the L-class JUICE (JUpiter ICy moons Explorer), launched in 2023 to investigate Jupiter's ocean worlds Ganymede, Callisto, and Europa for habitability clues; LISA (Laser Interferometer Space Antenna), a planned 2030s gravitational wave detector in collaboration with NASA. In the M-class, Solar Orbiter (launched 2020) studies the Sun's polar regions and solar wind; Euclid (launched 2023) maps the Universe's structure to unravel dark energy; PLATO (planned for 2026) hunts for Earth-like exoplanets; Ariel (planned for 2029) analyzes exoplanet atmospheres; and EnVision (planned for 2031) explores Venus's geology and climate. The S-class features CHEOPS (launched 2019), which measures exoplanet sizes and densities, while F-class missions encompass Comet Interceptor (planned for 2029) to rendezvous with a pristine comet and SMILE (planned for 2026), a joint ESA–China effort to image Earth's magnetosphere interactions with solar wind. These missions collectively advance ESA's legacy in transformative space science, with ongoing implementations ensuring sustained impact through the programme's concluding years.

Programme Overview

Scientific Themes

The Cosmic Vision programme is guided by four flexible scientific themes, which serve as the foundational rationale for selecting and developing space science missions. These themes, adopted to address key questions in cosmology, , and fundamental physics, are: (1) What are the conditions for planet formation and the emergence of ? This theme explores the processes enabling habitable environments in the Solar System and on exoplanets. (2) How does the Solar System work? It focuses on the dynamics, evolution, and interactions within our Solar System, from the Sun to its outermost reaches. (3) What are the fundamental physical laws of the ? This investigates the underlying principles governing cosmic phenomena, including , particle interactions, and high-energy processes. (4) How did the originate and what is it made of? It probes the early , cosmic composition, , , and the mechanisms driving cosmic expansion. These themes emerged from a structured consultative process initiated in 2004 to shape ESA's science programme for 2015–2025. In April 2004, ESA issued a public call for theme proposals, inviting input from the European science community, which resulted in 151 submissions analyzed by advisory bodies such as the Solar System Working Group, Astrophysics Working Group, Fundamental Physics Advisory Group, and Space Science Advisory Committee. A key workshop in in September 2004 gathered approximately 400 scientists for discussions, incorporating cross-disciplinary perspectives from earlier 2003 brainstorming sessions by expert panels. The themes were refined through a symposium in in April 2005 and endorsed by the Science Programme Committee in May 2005, marking their formal adoption in 2005–2006 as a flexible framework succeeding the Horizon 2000 and Horizon 2000 Plus plans. The design of these themes promotes interdisciplinary mission proposals that can address multiple questions simultaneously, enhancing scientific efficiency and innovation. For instance, concepts investigating might link theme 1 ( formation and ) with theme 2 (Solar System workings) by comparing extrasolar systems to our own, or connect to theme 4 through studies of cosmic chemical evolution. This overlap encourages proposals that leverage shared technologies across themes, such as advanced for both planetary atmospheres and observations. Mission classes provide the structural means to implement these themes through competitive selections.

Mission Classification

The Cosmic Vision programme structures its missions into four classes—F-class (fast), S-class (small), M-class (medium), and L-class (large)—differentiated by cost envelopes, development timelines, and complexity to optimize resource allocation and scientific output. F-class missions emphasize rapid development using mature technologies, with an ESA cost at completion capped at 175 million euros (2021 economic conditions) and a launch targeted within 5 years of selection, often as secondary payloads accompanying larger missions. S-class missions, led primarily by member states with ESA support, feature a tighter cost envelope of up to €50 million to ESA and development periods of 6-8 years post-selection, enabling focused investigations with reduced risk. M-class missions involve moderate complexity and international partnerships, with ESA costs typically ranging from €300–550 million (2021 economic conditions for upper limit) and launches 8-10 years after selection. L-class missions represent efforts with ambitious scopes, with ESA costs up to approximately €1 billion (as of 2020s economic conditions, adjusted for from initial €650 million cap in 2006 euros), development exceeding 10 years, and reliance on major international collaborations for funding and expertise. Cost envelopes have been adjusted over time for ; by 2025, actual L-class costs reached around €900 million for missions like . Programme allocation balances ambition and feasibility, envisioning one L-class mission opportunity every 7-8 years, two M-class missions per decade, and frequent calls for multiple S- and F-class missions to foster and agility within budget limits. This distribution ensures a steady pipeline of missions addressing the programme's scientific themes, from exoplanets to cosmology, while accommodating evolving priorities. Classification criteria prioritize alignment with scientific objectives, assessed through competitive open calls, alongside evaluations of technological readiness (requiring key elements at 5 or higher at proposal stage), feasibility, and adherence to cost constraints via by ESA's Solar System Working Group, Space Science Advisory Committee, and independent experts. Proposals must demonstrate clear scientific impact within the defined envelopes, with downselection based on balanced scorecards weighing innovation, risk, and programme fit. The class framework evolved from the 2005 Cosmic Vision formulation, which initially emphasized L- and M-class missions to succeed Horizon 2000, with cost envelopes set at around €650 million for L-class and €300 million (2006 euros) for M-class to ensure sustainability. Post-2010 financial reviews, prompted by budget overruns and economic pressures, introduced S-class in 2012 for cost-effective national-led efforts under €50 million and F-class around 2016 for accelerated implementations up to €175 million (2021 euros), enhancing flexibility and control over expenditures while expanding opportunities without inflating the overall programme baseline.

Historical Context

Preceding Programmes

The European Space Agency's (ESA) space science efforts prior to Cosmic Vision were anchored in the Horizon 2000 programme, approved in 1984 as a foundational long-term strategy spanning 1985–2000. This initiative replaced fragmented, ad-hoc mission selections with a structured framework featuring four flagship "cornerstone" missions aimed at tackling fundamental questions in astrophysics, heliophysics, and cosmology. Key examples included the Solar and Heliospheric Observatory (SOHO), a joint ESA-NASA mission probing solar phenomena; the X-ray Multi-Mirror Mission (XMM-Newton), focused on high-energy astrophysics; the Infrared Space Observatory (ISO), which surveyed the universe in infrared wavelengths; and the Far Infrared and Submillimetre Telescope (FIRST, later Herschel), targeting star formation and galaxy evolution. To enhance adaptability, Horizon 2000 incorporated "flexible" missions—such as the Cluster constellation for magnetospheric studies and the International Gamma-Ray Astrophysics Laboratory (Integral) for gamma-ray sources—allowing for opportunistic projects within available budgets. This approach established enduring 15-year planning cycles, promoting predictable funding trajectories and international collaborations that amplified Europe's scientific reach. Building on Horizon 2000's momentum, ESA formulated Horizon 2000 Plus in 1994–1995 as an extension projecting activities through 2016 and beyond. This phase reaffirmed the cornerstone model while expanding it with four new large-scale missions: the satellite for precision and mapping; the (LISA) for detection; the X-ray Evolving-Universe Spectroscopy mission (XEUS, evolving into the International X-ray Observatory concept); and ESA's contributions to the Next Generation Space Telescope (NGST, now the ). It also enabled the realization of delayed Horizon 2000 elements, including the and the Planck mission for observations, both launched in 2009. Horizon 2000 Plus introduced enhanced thematic flexibility, permitting adjustments to mission scopes based on technological maturation and interdisciplinary synergies, thus bridging , , and fundamental physics. By the early 2000s, escalating budget constraints—coupled with accelerating scientific breakthroughs in fields like exoplanets and —necessitated a pivot from Horizon 2000 Plus's predefined cornerstones to a more dynamic structure. ESA's fixed mission pipeline struggled to accommodate rapid advancements and fiscal realities, including flat science programme funding around 600–700 million euros annually, prompting a "vision"-oriented paradigm that prioritized flexible calls for ideas over locked-in selections. This evolution, driven by broad astronomical community input in 2004, fostered resilience against uncertainties while preserving core principles of excellence. These predecessor programmes indelibly shaped Cosmic Vision through the institutionalization of decadal planning horizons, robust international partnership models exemplified by NASA and JAXA collaborations, and a balanced emphasis on flagship ventures alongside adaptable elements to optimize impact under resource limits. Such foundations directly informed Cosmic Vision's 2015–2025 framework.

Formulation and Approval

The formulation of Cosmic Vision began in 2005 when the European Space Agency's (ESA) Science Programme Committee (SPC) endorsed the new long-term plan for space science missions spanning 2015–2025, succeeding the Horizon 2000 Plus framework. This initiative was presented to the scientific community through a series of consultations beginning with a major workshop in Paris in September 2004 that gathered over 400 participants, followed by further events in spring 2005. The plan emphasized addressing fundamental questions in cosmology, astrophysics, and planetary science, drawing on input from ESA's advisory structures such as the Astronomy Working Group and Solar System Working Group. Between 2006 and 2008, ESA conducted extensive public consultations to shape the program's themes and mission concepts, culminating in the release of the "Cosmic Vision: Space for 2015–2025" report (ESA BR-247), which outlined four overarching scientific themes: "What are the conditions for planet formation and the emergence of ?"; "How does the Solar System work?"; "What are the fundamental physical laws of the ?"; and "How did the originate and what role is played by and ?". A formal call for mission proposals was issued in March 2007, resulting in over 60 letters of intent and 50 full mission concepts submitted by June 2007, covering , fundamental physics, and Solar System exploration. These submissions, totaling more than 150 ideas when including preliminary themes, underwent competitive assessment studies in 2008–2009 to prioritize feasible, high-impact options. The 2008 global financial crisis posed significant challenges, prompting budget adjustments at the ESA Ministerial Council meeting in that November, where member states approved a science program level of resources (LoR) of €2.327 billion for 2009–2013, lower than initially requested and leading to delays or cancellations of some preparatory activities. This constrained environment necessitated reductions in mission class sizes and a sharper focus on proposals with broad scientific return and international collaboration potential, such as joint efforts with on concepts like the merged X-ray observatory studies. By 2011, these efforts yielded the down-selection of the first missions, including as the M1 medium-class mission and confirmation toward (JUICE) as the L1 large-class mission, marking initial implementation steps. Final approval came at the 2012 ESA Ministerial Council in , where ministers endorsed the full Cosmic Vision portfolio and established a budget envelope for the program over 2015–2025, enabling steady-state mission launches every 18 months while accommodating ongoing operations and technology development. This decision solidified the program's structure, with F-, M-, L-, and S-class missions prioritized for competitive selection, ensuring alignment with Europe's scientific ambitions amid fiscal prudence.

Mission Portfolio

F-Class Missions

The F-class missions within ESA's Cosmic Vision programme represent a category of small, rapidly developed spacecraft designed for innovative, opportunistic science with a focus on timely implementation and cost efficiency. These missions emphasize the use of proven technologies and rideshare opportunities to minimize development time, typically aiming for launch within five to seven years of selection, while maintaining a spacecraft wet mass under 1000 kg. By leveraging auxiliary payload slots on larger launches, such as those for M-class missions, F-class projects reduce costs and enable quick responses to emerging scientific needs, filling observational gaps left by more ambitious undertakings. The selection process for F-class missions features accelerated cycles to support rapid execution. For instance, the initial call for F1 proposals was issued in , with evaluation and selection occurring in , allowing for adoption and development to commence shortly thereafter. Similarly, the F2 call opened in 2021, leading to selection in November 2022 after peer-reviewed assessments of scientific merit, technical feasibility, and alignment with Cosmic Vision themes. These streamlined timelines, often involving phase 0/A studies within months, prioritize missions that can integrate mature components like standard star trackers and propulsion systems to avoid extensive qualification delays. Budgets are capped to promote efficiency, with costs to ESA typically around €150 million for the full mission, including rideshare arrangements. Key examples illustrate the F-class approach's emphasis on targeted science returns. The F1 mission, , selected in 2019, comprises a primary and two small probes to rendezvous with a pristine long-period comet or at the Sun-Earth L2 point, providing the first in-situ data on such bodies' composition and dynamics to probe early Solar System formation. This addresses theme 2 of Cosmic Vision by offering high-resolution, multi-angle observations that complement ground-based surveys and larger missions like . The F2 mission, ARRAKIHS (A Repeating survey with RAdius of 1 kpc, Imaging the Halo Structures), selected in 2022, employs a wide-field imager in visible and near-infrared bands to map ultra-low surface brightness features in nearby galaxy halos, testing models of distribution and galaxy evolution under theme 4. Its innovative detector technology enables detection of faint stellar streams at sensitivities beyond current facilities, enhancing understanding of cosmological . As of November 2025, both F-class missions remain in active development phases, with no launches yet achieved. is progressing through implementation, targeting a 2029 rideshare launch aboard an rocket alongside the M4 mission, following successful completion of its Phase B studies and instrument prototyping. ARRAKIHS has completed Phase A and is in Phase B, with mission adoption anticipated in mid-2026 and a projected launch in the early , potentially via Vega-C or a rideshare configuration to optimize costs. These efforts underscore the F-class model's role in delivering agile science, though operational data and discoveries await post-launch phases; recent passages, such as Comet 3I/ATLAS in 2025, have highlighted the mission's potential timeliness. No additional F-class calls have yielded selections by late 2025, but ongoing Voyage 2050 planning may extend the format.

S-Class Missions

The S-Class missions within the ESA Cosmic Vision programme represent small-scale endeavours, capped at approximately €50 million in ESA funding, designed to deliver targeted scientific investigations through innovative instrumentation and efficient implementation. These missions complement the broader portfolio by enabling rapid advancement in specific areas of space science, often leveraging international collaborations to enhance capabilities within constrained budgets. Unlike larger classes, S-Class projects emphasize focused objectives, typically involving a single primary instrument or suite, and serve as agile responses to emerging scientific priorities in the programme's themes. The first S-Class mission, CHEOPS (CHaracterising ExOPlanet Satellite), selected in October 2012, exemplifies this approach by providing precise photometric measurements of known exoplanet radii to refine mass-radius relationships and models of planetary interiors. Launched successfully on 18 December 2019 aboard a Soyuz rocket from Kourou, French Guiana, CHEOPS operates from a low Earth orbit and has contributed key data to exoplanet characterization, aligning with Cosmic Vision's first scientific theme on conditions for planet formation and life emergence. Its development highlighted cost-effective reuse of existing technologies, such as the satellite platform derived from earlier missions, achieving operational status within a streamlined timeline. Building on this foundation, the second S-Class mission, (Solar wind Magnetosphere Ionosphere Link Explorer), was selected in November 2015 following a competitive assessment phase and formally adopted in March 2019 as a joint endeavour with the (CAS). This partnership, equally shared between ESA and CAS, underscores the programme's emphasis on international cooperation to pool expertise and resources, with ESA leading the spacecraft platform and mission operations while CAS provides key instruments and the launch interface. addresses Cosmic Vision's second theme—"How does the Solar System work?"—by investigating the dynamic coupling between the , Earth's , and , offering unprecedented global-scale observations of plasma interactions that influence . Central to SMILE's innovation are its four instruments: the Soft X-ray Imager (SXI), developed by a UK-led , which captures wide-field images of magnetospheric plasma boundaries using soft s for the first time from ; the Ultraviolet Imager (UVI) for auroral monitoring; the Light Ion Analyser (LIA) to measure incoming properties; and a (MAG) for in-situ data. These tools enable simultaneous remote imaging and local measurements, providing unique insights into energy transfer and plasma dynamics during solar-terrestrial events, far beyond what ground-based or prior orbital observatories can achieve. The mission's , reaching 121,000 km apogee over the , optimizes visibility of polar regions for a three-year nominal lifetime. As of November 2025, has completed joint China-Europe qualification and flight acceptance reviews, advancing to final integration and environmental testing at ESA's ESTEC facility in the , including , , and trials to ensure readiness for the . The spacecraft's two main modules were integrated in early 2025, with ongoing preparations targeting a launch in via Vega-C from Europe's in . This marks the completion of the allocated S-Class slots under Cosmic Vision 2015-2025, fulfilling the programme's vision for compact, high-impact contributions that complement faster F-Class options for opportunistic science.

M-Class Missions

The M-Class missions represent the core of the Cosmic Vision programme, offering medium-sized, cost-capped explorations (approximately €500 million per mission) that enable targeted scientific investigations with opportunities for broad international participation. These missions balance ambition and feasibility, typically involving orbiters or probes with advanced to address key themes such as the conditions for and formation and the Sun's influence on the . Unlike larger L-Class flagships, M-Class efforts emphasize focused objectives and collaborative development, fostering contributions from ESA member states, , , and other agencies. The selected M-Class missions form a diverse portfolio spanning heliophysics and planetary science. M1, Solar Orbiter, launched in 2020 (planned as 2017 in initial proposals), is a joint ESA-NASA mission dedicated to heliophysics under theme 2, performing close-up observations of the Sun's polar regions to study solar wind origins and magnetic activity using ten instruments, including the Polarimetric and Helioseismic Imager (PHI). M2, BepiColombo, launched in 2018, explores Mercury under theme 2 in partnership with JAXA, comprising the Mercury Planetary Orbiter (ESA) and Mio (JAXA) to investigate the planet's geology, magnetic field, and exosphere via dual spacecraft with suites like the Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS). M3, PLATO (PLAnetary Transits and Oscillations of stars), planned for launch in 2026, targets exoplanets under theme 1 with a space telescope array of 26 cameras to detect Earth-like worlds and characterize host stars through asteroseismology. M4, Ariel (Atmospheric Remote-sensing Infrared Exoplanet large-survey), scheduled for 2029, focuses on exoplanet atmospheres under theme 1, employing a 1-meter telescope and spectrometers to analyze chemical compositions in over 1,000 planetary systems. M5, EnVision, set for 2031, addresses Venus under theme 1 with an orbiter featuring a synthetic aperture radar (VenSAR) and subsurface sounding to probe geological evolution and habitability potential. Development of these missions proceeded through competitive selections to ensure scientific excellence and technical viability. For instance, M1 and were chosen in 2011 following assessments initiated in 2007, while M3 was selected in 2017 from candidates like STE-QUEST and . Partnerships enhance capabilities: provides the Solar Orbiter launch and instruments, contributes the Mio orbiter and launch for , and Ariel involves over 50 institutes across 16 countries for its off-axis telescope and IR channel (AIRS) spectrometers, which resolve molecular signatures like and . EnVision's Phase A studies concluded by 2023, incorporating contributions for the Venus Emissivity, Radio Science, and Radar (Veritas) polarimeter. These processes prioritize modular designs and heritage technologies to meet timelines within the €450-550 million cap. Scientifically, M-Class missions advance understanding of Solar System formation and exoplanetary diversity. 's data has mapped sources and coronal mass ejections, revealing dynamic polar fields. BepiColombo's instruments will elucidate Mercury's induced and volcanic history, building on findings. and enable precise exoplanet demographics and atmospheric mapping, identifying biosignatures. targets Venus's resurfacing and atmospheric dynamics to assess past habitability. Collectively, these efforts provide datasets for comparative planetology, with early results demonstrating theme 2 impacts on prediction. As of , is in its operational phase, completing multiple perihelion passes and releasing high-resolution images. remains in cruise, having conducted flybys including its fifth and sixth Mercury encounters in late and early , with orbit insertion planned for 2026. and Ariel are in the build and integration phases, with payload assembly underway. has completed Phase A, advancing to detailed design with international instrument verification.

L-Class Missions

The L-class missions within ESA's Cosmic Vision programme represent the highest investment category, with costs exceeding €800 million each, designed as transformative flagships to address major scientific questions through extensive international partnerships and cutting-edge technology. These missions emphasize large-scale surveys and in-depth explorations, involving collaborations among ESA member states, , , and other agencies, often uniting over a thousand scientists globally. As of November 2025, only the first L-class mission has launched, while the subsequent ones remain in advanced planning or development phases, with launches projected beyond the programme's 2025 horizon. The inaugural L-class mission, (), launched on 14 April 2023 aboard an rocket from , , targets the system to investigate the emergence of habitable environments, aligning with Cosmic Vision Theme 1 on conditions for life and planet formation. features 10 instruments, including NASA's spectrograph UVS and JAXA's imager Hosoda, developed through a involving over 20 European institutions, , and , with contributions from more than 1,500 scientists worldwide. Key technological advancements include radiation-hardened electronics and solar arrays optimized for the intense Jovian radiation environment, enabling a planned orbital insertion at Ganymede in December 2034 after a complex trajectory involving multiple gravity assists. The mission's primary scientific objectives involve characterizing the icy moons Ganymede, Europa, and Callisto through at least 35 close flybys, assessing subsurface oceans, surface compositions, and magnetic interactions to evaluate their potential for . By November 2025, is en route following its flyby in August 2025 and the earlier Earth-Moon flyby in August 2024, with the spacecraft conducting opportunistic during cruise, including planned observations of interstellar 3I/ATLAS in late November using its cameras and spectrometers. The second L-class mission, (Advanced Telescope for High Energy , now termed NewAthena), selected in 2014, focuses on the hot and energetic , probing Theme 4 on the origins and fate of the through observations of holes, galaxy clusters, and cosmic web structures. This mission involves a broad international team, including contributions to instrument development and over 1,000 scientists from ESA member states, with advanced features like a 12-metre mirror assembly for unprecedented (5 arcseconds) and two flagship instruments: the Wide Field Imager for surveys and the Integral Field Unit for high-resolution . aims to map the growth of supermassive holes across and trace baryonic in the intergalactic medium, providing insights into distribution and universe evolution. As of November 2025, remains in the detailed study phase following a 2022 cost review that prompted design optimizations, with ESA planning mission adoption in early 2027 and a potential launch in the early to the Sun-Earth L2 point. The third L-class mission, LISA (Laser Interferometer Space Antenna), selected in 2017 and formally adopted in January 2024, addresses Theme 3 on fundamental physical laws by detecting low-frequency , offering a new window into cosmic events like mergers and the early . LISA comprises three forming a triangular interferometer with 2.5 million km arms, involving a vast collaboration of over 1,200 scientists from the LISA Consortium across ESA, , and 20+ countries, with providing systems and detectors. Technological highlights include picometre-precision and drag-free control to isolate gravitational signals from noise. The mission will observe waves in the millihertz band, enabling and mapping the from cosmic . By November 2025, development has advanced with the industrial contract awarded to OHB System AG in June 2025 for construction, targeting a launch in the mid-2030s to a .

Implementation and Outcomes

Selection Processes

The selection processes for missions within ESA's Cosmic Vision programme (2015–2025) are structured as a multi-stage, competitive evaluation to ensure high scientific return while adhering to budgetary and technical constraints. Calls for proposals are issued for specific mission opportunities aligned with the programme's four scientific themes, typically targeting one mission class per call (e.g., M-class for medium-sized missions or S-class for small missions). Proposers submit Letters of Intent followed by full proposals, which undergo screening for completeness and relevance. Top proposals then advance to by ad-hoc expert panels convened under ESA's advisory structure, including discipline-specific Working Groups such as the Solar System Working Group (SSWG), Astrophysics Working Group (AWG), and Fundamental Physics Advisory Group (FPAG). These panels assess proposals based on criteria including scientific excellence and potential return, timeliness of the , technological maturity, and profile, opportunities for international cooperation, and public engagement potential. Following peer review, recommendations are forwarded to the Space Science Advisory Committee (SSAC), which ranks candidates and advises the Science Programme Committee (SPC) on shortlisting typically three proposals per call for Phase 0/A studies. These preliminary studies, lasting 6–12 months, refine mission concepts, payloads, and implementation plans, culminating in detailed assessment reports (Yellow Books). The SSAC then reviews these reports to recommend downselection, usually to one or two finalists for the Phase B definition phase, where full technical and cost models are developed. Final adoption requires SPC approval, with implementation subject to available funding from ESA member states. For smaller S-class and F-class (flexible) missions, the process is accelerated to emphasize rapid development and lower costs (under €50 million for ESA), often involving partnerships to share burdens. Emphasis is placed on thematic diversity to balance Solar System exploration with and cosmology missions, ensuring the portfolio addresses all Cosmic Vision themes without over-concentration in one area. Evaluation criteria prioritize scientific merit as the dominant factor, accounting for the proposal's ability to advance key questions in the Cosmic Vision themes, while feasibility and cost-risk assessments ensure practicality within ESA's annual budget of approximately €800–900 million. International collaboration is encouraged, requiring letters of commitment from partners (e.g., or CNSA) outlining contributions, which can influence scoring by reducing ESA's financial load and enhancing global impact. Peer reviewers, excluding principal investigators and close collaborators to avoid , apply standardized scoring rubrics, with transparency ensured through de-identified evaluations and conflict-of-interest protocols. For L-class missions, which exceed €1 billion in cost, the process mirrors the above but includes an additional layer of scrutiny at ESA's Ministerial meetings, where member states vote on funding based on strategic priorities and economic contributions. Illustrative examples highlight the competitiveness: the 2010 call for the M3 medium-class slot received 47 proposals, leading to the selection of four candidates (, , , and STE-QUEST) for assessment studies, with eventual downselection to one implementation. Similarly, the 2014–2015 M4 call garnered 27 proposals, shortlisting , THOR, and XIPE for Phase 0/A, demonstrating the rigorous filtering to two or fewer finalists. The joint ESA–Chinese Academy of Sciences call in 2015 for the S1 small-class opportunity attracted 13 proposals, resulting in 's selection as the sole candidate after evaluation, underscoring the role of bilateral partnerships in streamlining processes for cost-capped missions. For L-class, the 2008–2011 cycle involved ministerial review at the 2011 ESA Council, where was approved from competing concepts like LAPLACE, reflecting the need for consensus among 22 member states on high-stakes investments. Post-2015, the programme adapted to fiscal pressures from currency fluctuations and overruns in earlier missions (e.g., delays in and ), leading to refined cost caps and extended timelines for subsequent calls. This included stricter Phase A gate reviews to mitigate risks and occasional deferrals of slots, such as shifting M5 selections to accommodate budget reallocations without compromising thematic balance. These adjustments maintained the programme's cadence of roughly one launch every 18–24 months while prioritizing missions with mature technologies to avoid escalation.

Launch Timeline and Status

The Cosmic Vision programme's missions were launched progressively from 2019 to 2025, with several entering operational phases and others en route to their targets as of November 2025. The programme marked the successful deployment of four missions by mid-2023, including the first L-class mission, while two additional missions faced delays but remained on track for near-term launches. Key milestones include the initiation of science operations for early missions like and CHEOPS, and the commencement of nominal surveys for newer observatories such as .
MissionClassLaunch DateCurrent Status (November 2025)
M110 February 2020Operational; completed flyby in February 2025 and provided first clear imaging of the Sun's in March 2025, with ongoing.
CHEOPSS118 December 2019Operational at ; mission extended through 2026, with improved sky observability announced in November 2025.
M21 July 2023Operational at Sun-Earth L2; nominal survey began 14 February 2024, Quick Data Release 1 issued 19 March 2025, and new science results released in mid-November 2025.
L114 April 2023En route to ; completed Lunar-Earth flyby in August 2024, with flyby completed in August 2025 and observations of interstellar comet 3I/ATLAS conducted in November 2025; arrival at in July 2031.
S22026Pre-launch; integration tests completed, but delayed from original 2023 target due to technical and launcher issues; scheduled for Vega-C from .
M3December 2026Pre-launch; spacecraft assembly completed in October 2025 and undergoing final environmental tests; delayed from 2024 due to impacts on development.
F12029Pre-development; Phase B1 completed in 2024, with ongoing preparations for launch on a flexible timeline.
Operational missions have achieved significant milestones, such as Euclid's early release observations in May 2024 and Solar Orbiter's polar observations in early 2025, enabling initial data collection for their scientific objectives. continues its cruise phase with gravity-assist maneuvers, including its encounter in August 2025 to refine its trajectory. These updates reflect post-selection execution, where initial timelines from the were adjusted based on engineering reviews. The programme faced challenges from launch vehicle transitions and geopolitical events. The retirement of after JUICE's 2023 launch necessitated shifts, including Euclid's move from the delayed to a SpaceX in 2023 due to the suspension of Russian Soyuz launches following the 2022 Ukraine crisis, which limited European access to reliable heavy-lift options. 's own rollout included a on 5 November 2025, further complicating schedules for missions like , now assigned to in 2026. Vega-C delays also impacted SMILE's timeline. These factors extended some missions' preparations without halting the overall portfolio. As the endpoint for new mission selections under Cosmic Vision (2015-2025), the programme concluded active in 2025, with no further calls issued; however, launched missions will generate data well into the , bridging to the successor Voyage 2050 framework. Ongoing operations from the missions ensure continued scientific output beyond the programme's formal closure.

Legacy and Transition

Key Achievements

The Cosmic Vision program has delivered significant scientific breakthroughs through its missions, particularly in cosmology, exoplanet characterization, and solar system exploration. The Euclid mission, launched in 2023, released its first data in March 2025, providing early constraints on models by mapping billions of galaxies and analyzing their distribution to probe the universe's expansion history. Similarly, the CHEOPS satellite has identified rare s, including a unique six-planet system with synchronized orbits, enhancing understanding of planetary formation dynamics. For outer solar system studies, the mission's initial cruise phase, following its 2023 launch, built on precursor data from missions like Galileo to refine models of Ganymede's and subsurface ocean, during its Earth-Moon flyby in August 2024 for trajectory adjustments and instrument calibration. Preparatory efforts for , including 2025 data challenges, have advanced spectroscopy techniques, simulating atmospheric retrievals to prepare for population-level studies of hundreds of s post-2029 launch. Technological innovations under Cosmic Vision have pushed boundaries in instrument design and spacecraft engineering. BepiColombo's development of radiation-tolerant electronics, including CMOS-based detectors capable of withstanding Mercury's intense radiation environment, has set standards for future inner solar system missions, enabling reliable data collection during its 2025 arrival. Euclid's wide-field imager, featuring a 600-megapixel visible instrument with 0.54 square degrees , represents a leap in high-resolution cosmic mapping, achieving unprecedented depth for weak lensing studies. Meanwhile, CHEOPS demonstrated miniaturized payload capabilities with its 300 mm Ritchey-Chrétien telescope integrated into a compact CubeSat-like platform, optimizing photometric precision for transits within severe resource constraints. Broader impacts of Cosmic Vision extend to knowledge dissemination and international collaboration. By 2025, missions under the program have contributed to over 500 peer-reviewed publications, fostering advancements in and . The program has trained more than 1,000 early-career scientists through fellowships and working groups, enhancing Europe's expertise in space research. Collaborations have strengthened ties with and , as seen in joint contributions to and , promoting shared data analysis and technology exchange. Quantitatively, Cosmic Vision has utilized approximately €3 billion in funding through the ESA Science Programme's allocations from 2015 to 2025, supporting a portfolio of six launched missions. The program achieved a 90% success rate in meeting launch schedules and orbital insertions, with only minor delays in non-critical elements.

Post-2025 Developments

The late 2025 ESA Ministerial Council, scheduled for 26-27 November, is expected to review the agency's space science portfolio and confirm the conclusion of the Cosmic Vision 2015-2025 programme with no further calls for new missions under its framework, redirecting resources toward the emerging Voyage 2050 initiative for missions operating from 2035 onward. As of November 2025, preparations for the Ministerial Council underscore the programme's wind-down, with focus shifting to Voyage 2050 implementations. Planning for Voyage 2050, which emphasizes themes such as temperate exoplanets and , was advanced through community white papers and workshops starting in 2019, with key theme selections finalized by 2021 and ongoing refinements in 2024-2025 to integrate lessons from Cosmic Vision's executed missions. Ongoing operations from Cosmic Vision continue to provide scientific value beyond 2025, exemplified by the extension of Solar Orbiter's mission phase until at least 2030, enabling deeper heliospheric studies following its nominal operations through 2026. Data from these missions are preserved and disseminated through ESA's dedicated Science Data Centres, including the European Space Astronomy Centre (ESAC) and Planetary Science Archive (PSA), which host peer-reviewed observations and engineering datasets for public access and analysis. Guest investigator programmes, such as those for Cluster and similar missions, remain open to the scientific community, offering opportunities for proposed observations and data exploitation into the late 2020s. Key transitions include the relocation of the L3-class mission LISA to the Voyage 2050 framework, with construction commencing in June 2025 for a 2035 launch to detect in space. Cosmic Vision's exoplanet-focused efforts, including missions like Ariel and , have influenced subsequent initiatives by establishing methodologies for atmospheric characterization, which align with Voyage 2050's emphasis on habitable worlds and contribute to broader collaborations such as NASA's programme through shared expertise in . Looking ahead, the programme's legacy informs the next science cycle by prioritizing sustainability in mission design—such as reduced propellant use and recyclable components—and enhanced AI applications for , as demonstrated in ESA's ongoing integration of for analysing vast archives from missions like . These advancements ensure continuity in addressing fundamental questions about the while adapting to evolving technological and environmental priorities.

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