CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Upsilon Andromedae alien planets. Artwork showing planets orbiting the star Upsilon Andromedae (Ups And, upper left). This was the first Sun-like star found to have more than one planet orbiting it. At lower right is Ups And d, the largest of the three planets. This gas giant has over four times Jupiter's mass, and orbits 375 million kilometres from the star (2.5 times the Earth-Sun distance). At centre left is Ups And c, a gas giant with less than half the mass of Ups And d, which orbits at a third of Ups And d's distance. To the left of the star is Ups And b, a still smaller gas giant that orbits less than 9 million kilometres from the star. This system lies 54 light years from Earth.
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