LYNETTE COOK / SCIENCE PHOTO LIBRARY LYNETTE COOK / SCIENCE PHOTO LIBRARY
Not for use in any materials for children and youth preschool through grade 12.
Planet HD 209458b and parent star. Artwork of the extrasolar planet HD 209458b orbiting its parent star HD 209458. The Sun-like star lies 153 light years away from Earth in the constellation of Pegasus. HD 209458b was the first extrasolar planet witnessed passing in front of its star. The atmosphere of the planet is made of hydrogen and as this gas slowly leaks into space, it forms a tail like a comet. 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.
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