Soviet spacecraft Luna 6, destined for a moon landing, failed after flying right past it.
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NASA's Ingenuity helicopter became the first helicopter to fly on another planet.
NASA completed a successful mission to map the Moon's gravity field.
Three astronauts, Richard J. Hieb, Thomas D. Akers, and Pierre J. Thuot, simultaneously walked in space for the first time.
The Soviet Union's uncrewed Buran space shuttle completed its first and only space flight.
Voyager 1 passed Pioneer 10 to become the most distant human-made object in space.
