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Distant planet may be on its second atmosphere, NASA's Hubble finds


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IMAGE: This is an artist s impression of the Earth-sized, rocky exoplanet GJ 1132 b, located 41 light-years away around a red dwarf star. Scientists using NASA s Hubble Space Telescope have found.
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Credit: Credits: NASA, ESA, and R. Hurt (IPAC/Caltech)
Scientists using NASA s Hubble Space Telescope have found evidence that a planet orbiting a distant star may have lost its atmosphere but gained a second one through volcanic activity.
The planet, GJ 1132 b, is hypothesized to have begun as a gaseous world with a thick hydrogen blanket of atmosphere. Starting out at several times the diameter of Earth, this so-called sub-Neptune is believed to have quickly lost its primordial hydrogen and helium atmosphere due to the intense radiation of the hot, young star it orbits. In a short period of time, such a planet would be stripped down to a bare core about the size of Earth. That s when things got interesting. ....

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