The New York Times published a correction to their 1920 editorial that ridiculed Robert Goddard's ideas about rockets functioning in a vacuum. This correction, published the day after the launch of Apollo 11, acknowledged that rockets can function in a vacuum, thus vindicating Goddard's earlier work.

Robert Goddard launched the world's first liquid-fueled rocket in Auburn, Massachusetts. The rocket, fueled with gasoline and liquid oxygen, rose 41 feet and traveled 184 feet in 2.5 seconds. This event marked a significant milestone in the development of rocketry and space exploration, demonstrating the feasibility of liquid-fueled rockets. Crew chief Henry Sachs, Esther Goddard, and Percy Roope, assistant professor in the physics department at Clark accompanied Goddard at the launch.

Robert Goddard married Esther Christine Kisk, a secretary in Clark University's President's office. Esther became enthusiastic about rocketry and played a vital role in documenting his work, aiding in experiments, and managing paperwork.

Robert Goddard and Clarence N. Hickman successfully demonstrated a tube-fired rocket to the U.S. Army Signal Corps at Aberdeen Proving Ground, Maryland. This demonstration, using two music stands for a launch platform, impressed the Army. The launcher concept became the precursor to the bazooka.

At the age of 17, Robert Goddard had a life-changing epiphany while climbing a cherry tree. He imagined creating a device that could travel to Mars. This day became known as "Anniversary Day" to him, a private commemoration of his greatest inspiration that fueled his lifelong dedication to space flight.