DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Alpha Centauri binary stars and planets. Artwork from above the surface of one of the moons of one of the planets in the Alpha Centauri binary star system. The moon's gas giant planet is at upper left. The binary stars are at lower right, with another gas giant planet to their left. The Alpha Centauri system lies 4.4 light years from the Sun and consists of two Sun-like stars just over 3 billion kilometres apart.
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