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The idea of alien life now seems inevitable

The thought that ET may exist is not as far-fetched as it used to be.

alien life
Relative sizes of planets that are in a zone potentially compatible with life: Kepler-22b, Kepler-69c, Kepler-62e, Kepler-62f and Earth (named left to right; except for Earth, these are artists’ renditions). Credit: NASA, CC BY