The planet, HD 189733b, is a gas giant larger than Jupiter. Due to a solar flare from it's host star, a mere three million miles away, is having it's atmosphere change with hydrogen exiting the atmosphere.
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ScienceDaily (June 29, 2012) — An international team of astronomers using data from NASA's Hubble Space Telescope has made an unparalleled observation, detecting significant changes in the atmosphere of a planet located beyond our solar system.
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First-ever changes in an exoplanet atmosphere detected