Ad astra is a Latin phrase meaning "to the stars". The phrase has origins with Virgil, who wrote in his Aeneid: "sic itur ad astra" ('thus one journeys to the stars') and "opta ardua pennis astra sequi" ('desire to pursue the high[/hard to reach] stars on wings'). Another origin is Seneca the Younger, who wrote in Hercules: "non est ad astra mollis e terris via" ('there is no easy way from the earth to the stars').

Ad is a Latin preposition expressing direction toward in space or time (e.g. ad nauseam, ad infinitum, ad hoc, ad libidem, ad valorem, ad hominem). It is also used as a prefix in Latin word formation.

Astra is the accusative plural form of the Latin word astrum 'star' (from Ancient Greek ἄστρον astron 'star', from Proto-Indo-European *h₂ster-).

Ad astra is used as, or as part of, the motto of many organizations, most prominently, military air forces. It has also been adopted as a proper name for various such things as publications, bands, video games, etc. It likewise sees general use as a popular Latin tag.

"To the stars on the wings of a pig"

"From the depths to the stars."

"Through adversity to the stars" or "Through struggle to the stars"

"Through hardships to the stars" or "To the stars through difficulties"