Coming from or relating to life and objects outside of Earth, especially from other planets or space.
From Latin 'extra-' meaning 'outside' + 'terrestrial' (from 'terra' meaning 'earth'). Coined in modern scientific contexts to describe anything beyond Earth's boundaries.
The famous equation Drake Equation tries to calculate how many intelligent alien civilizations exist, and most scientists think extraterrestrial life probably exists somewhere in the billions of galaxies, but contact with it would fundamentally change human civilization.
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