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AI Summary
- Project Serpo involved 12 astronauts sent to an alien planet 40 light-years away as part of a human-alien exchange program in 1965
- The mission lasted 13 years with astronauts experiencing alien contact, advanced technology 5,000 years ahead of Earth's, and alien culture firsthand
- Upon return, all evidence of the astronauts' existence was erased and survivors forced into new identities, sworn to secrecy about the experience
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