An artist’s conception of the “steam world” GJ 9827 d, shown in the foreground in blue. Image credit: NASA, ESA, Leah Hustak (STScI), Ralf Crawford (STScI)

Nearly 100 light years away, there’s a planet unlike any we’ve seen before. The planet, known as GJ 9827 d, is roughly twice the size of Earth and has an atmosphere composed almost entirely of water vapor, according to a new study.

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