Proxima Centauri b, illustration
Exoplanet Proxima Centauri b, illustration. Proxima Centauri b is an Earth-sized world orbiting the star nearest Earth, the red dwarf Proxima Centauri. The planet orbits in the star鈥檚 habitable zone, meaning it is warm enough for liquid water to exist on its surface., Photo by RON MILLER / SCIENCE PHOTO LIBRARY
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