NASA / ESA / STSCI / G. BACON / SCIENCE PHOTO LIBRARY NASA / ESA / STSCI / G. BACON / SCIENCE PHOTO LIBRARY
Planet HD 209458b and parent star. Artwork of the extrasolar planet HD 209458b orbiting the yellow dwarf star HD 209458 (orange). HD 209458b was the first extrasolar planet witnessed passing in front of this Sun-like star. The atmosphere of the planet is made up of hydrogen, which slowly leaks into space (seen here as a white haze). The planet is 200 times the mass of the Earth, but orbits only 6.5 million kilometres from the star. One orbit takes just 3.5 days. Both HD 209458b and its star lie about 153 light years from Earth, in the constellation Pegasus.
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