Artist's rendering of potentially habitable exoplanets, plus Earth (top right) and Mars (top center).

phlplanets768

Artist's rendering of potentially habitable exoplanets, plus Earth (top right) and Mars (top center).

Credits: PHL@UPR Arecibo (phl.upr.edu), ESA/Hubble, NASA
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Image CreditPHL@UPR Arecibo (phl.upr.edu), ESA/Hubble, NASA
Size640x348px