JOE TUCCIARONE / SCIENCE PHOTO LIBRARY JOE TUCCIARONE / SCIENCE PHOTO LIBRARY
Extrasolar planet. Illustration of the heavily-cratered surface of an extrasolar planet, with an associated dusty debris ring. Exoplanets so far discovered range from very large gas giant planets to rocky planets of various sizes. Hundreds of alien planets have been detected, and their planetary systems studied, with many thousands more not yet confirmed.
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