DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Kepler-186f. Computer illustration of the extrasolar planet Kepler-186f orbiting the red dwarf star Kepler-186 (lower left). This planet lies around 490 light years from Earth and is the first planet with a radius similar to Earth's to be found in the habitable zone of a star. The habitable zone is a region around a star where the surface temperature of the planet is suitable for liquid water.
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