DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Alien planet. Artwork of an extrasolar gas giant planet and two of its moons. The planet and its moons orbit a binary star system (upper left). Binary star systems are very common, and maybe half of all stars are part of a binary system. The Orion Nebula (red) is in the background. This is a region of star formation that is some 1500 light years from Earth in the constellation of Orion.
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