HD 209458b exoplanet evaporating

Videonummer 11927075
Animation of the extrasolar planet HD 209458b passing in front of its star, leaving a trail of gas. This planet is a so-called hot Jupiter , a gas giant planet that orbits very close to its star, just seven million kilometres in this case (the Earth is roughly 150 million kilometres from the Sun). This proximity leads to it having a very hot atmosphere, which is boiling off the planet as it orbits. Astronomers also detected a cloud and trail of atmospheric gases extending up to 200, 000 kilometres from the planet itself. As the planet transits the star as seen from Earth, its atmosphere can be probed spectroscopically, which led to the discovery of water its atmosphere. HD 209458b orbits its star every 3.5 days, and is 1.3 times as massive as Jupiter. The parent star, HD 209458, is a Sun-like star lying 150 light years from Earth in the constellation Pegasus.<br>Restrictions:
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Credit: Science Photo Library / HUBBLE / ESA / LARS LINDBERG CHRISTENSEN
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