NASA / ESA / G.BACON / STSCI / SCIENCE PHOTO LIBRARY NASA / ESA / G.BACON / STSCI / SCIENCE PHOTO LIBRARY
Earth-like alien planets. Computer illustration of Earth-like alien planets and distant galaxies. Earth-like planets capable of supporting life are found only in a star's habitable zone, a region around a star where the surface temperature of a planet is suitable for liquid water.
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