DALE DARBY / SCIENCE PHOTO LIBRARY DALE DARBY / SCIENCE PHOTO LIBRARY
Pegasi B. Artwork of the planet 51 Pegasi B near its sun, the star 51 Pegasi (centre left). Massive prominences are seen linking sunspots on the surface of the star. Pegasi is a Sun-like star some 42 light years from Earth. Pegasi B is about half as massive as Jupiter, and orbits only 7 million kilometres from the star, equivalent to 1/6th of Mercury's orbit around the Sun.
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