DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Double star system. Artwork of a ringed extrasolar planet orbiting a double star, seen from its orbiting moon. An extrasolar planet is a planet that orbits a star other than the Sun and therefore belongs to a planetary system other than our solar system. A double star system arises when two stars revolve around each other under their mutual gravitation.
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