The exoplanet HD 189733b lies so near its star that it completes an
orbit every 2.2 days. In late 2011, NASA's Hubble Space Telescope found
that the planet's upper atmosphere was streaming away at speeds
exceeding 300,000 mph. Just before the Hubble observation, NASA's Swift
detected the star blasting out a strong X-ray flare, one powerful enough
to blow away part of the planet's atmosphere.
Credit: NASA's Goddard Space Flight Center
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