Friendship 7

Friendship 7 carried the hopes of a nation still trailing the Soviet Union in the space race. Soviet cosmonauts Yuri Gagarin and Gherman Titov had already orbited Earth, and NASA needed an American orbital flight to prove the country could compete. On February 20, 1962, after repeated weather and technical delays that had stretched across weeks, John Glenn lifted off from Cape Canaveral aboard Mercury-Atlas 6.

Glenn's flight carried him through three orbits of Earth over nearly five hours, reaching speeds of roughly 17,500 miles per hour and altitudes exceeding 160 miles. During the first orbit, Glenn reported seeing thousands of small, glowing particles drifting past his window, which he described as looking like fireflies; engineers later determined they were ice crystals shaken loose from the spacecraft's exterior.

Partway through the flight, a warning light in Mission Control indicated that the spacecraft's landing bag, and with it the heat shield, might have come loose. If true, Friendship 7 could burn up during reentry without the shield firmly in place. Engineers on the ground decided not to jettison the retrorocket package after firing it, reasoning that its straps might help hold a loosened heat shield against the capsule during the fiery descent.

The decision worked, but it made for a harrowing reentry. As the retropack burned away in the atmosphere, Glenn watched flaming chunks of debris tumble past his window, uncertain whether he was witnessing the heat shield itself disintegrating. The shield had, in fact, never come loose; the warning had been a false sensor reading. Friendship 7 splashed down safely in the Atlantic, and Glenn returned home to a hero's welcome, including a ticker-tape parade through New York City attended by millions.

Friendship 7 closed the gap the Soviet Union had opened in the space race, proving the United States could put an astronaut into orbit and bring him home safely. The flight's success, and Glenn's calm handling of a genuinely dangerous reentry, made him one of the most celebrated Americans of the twentieth century.

The mission also exposed real gaps in spacecraft telemetry and sensor reliability that NASA worked to close in subsequent Mercury flights, reinforcing the value of conservative, safety-first decision-making even when the underlying data later proved wrong.

Glenn's flight demonstrated that orbital spaceflight, not just brief suborbital hops, was within America's reach, building crucial momentum and public support for the more ambitious Gemini and Apollo programs that followed.

Decades later, Glenn's return to space aboard Discovery in 1998 bookended an extraordinary career, connecting the earliest days of American human spaceflight directly to the Space Shuttle era and inspiring a new generation to see spaceflight as something achievable at almost any stage of life.