Asteroid 323 Brucia became the first asteroid discovered using photography.
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NASA launched its Active Magnetospheric Particle Tracer Explorers mission (AMPTE) from the Cape Canaveral launch pad.
Astronomer Edwin Hubble formally announced the existence of other galactic systems at a meeting of the American Astronomical Society.
Three Russian cosmonauts returned from space after spending a record time of 237 days in orbit.
The USSR's Voskhod 1 spacecraft became the first spaceflight with multiple crew members.
NASA's Apollo 11 orbited the moon.
