NASA NTRS · 20060034269
Asteroids and Aliens
Abstract
Discussion of extraterrestrial life (ETL) and extraterrestrial intelligent life (ETI) is extraordinarily complex and mulitidisciplinary, in part because relevant questions involve both the origin/evolution of terrestrial life and the future of human civilization.
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Ostro, S.. 1999-09-01. Asteroids and Aliens. https://ntrs.nasa.gov/citations/20060034269
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