DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Double star sunset on an alien planet with a large mooon (upper right), computer artwork. A double star system arises when two stars revolve around each other under their mutual gravitation. This planet and moon are orbiting the closer of the two stars, at left. This world has mountains rising above thick clouds. The moon's surface is barren and cratered, indicating that it has no atmosphere.
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