DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Extrasolar gas giant planet. Computer artwork of an extrasolar gas giant planet (left) seen from the surface of one of its moons. Gas giants are large planets that have a rocky or metallic core, but the majority of their mass is a mixture of gases. The Milky Way is seen at centre to upper left.
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