1961
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Events
- Astronaut Yuri Gagarin becomes the first Human in space. He makes a single low Earth orbit before parachuting to the ground in his craft.
- Astronaut Alan Shepard is the second Human in space.
- The "Drake equation" is written by Frank Drake.
This equation is a probabilistic argument, used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way Galaxy.
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