Gliese 229B became the first brown dwarf to be seen and identified by astronomers.
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After a four-month journey, the Venera 14 spacecraft landed on Venus.
NASA revealed that water vapor was discovered in the atmosphere of an Earth-size planet, the exoplanet K2-18b.
Astronauts on Apollo 15 discovered a rock that could date back to the birth of the moon.
The USSR's Voskhod 1 spacecraft became the first spaceflight with multiple crew members.
The US spacecraft Pioneer 10 launched.
