Hubble Space Telescope Finds Clouds On Super-Earth, Neptune-Sized Planets

Using NASA’s Hubble Space Telescope, two research teams have discovered thick layers of high-altitude clouds covering the atmospheres of two relatively nearby exoplanets: a super-Earth and a "warm Neptune."

Scientists are beginning to get a handle on how to study the atmospheres on alien planets, and have even found green clouds on the super-Jupiter planet, Kepler-7b. But the findings, published in the journal Nature this week, show that clouds can cover smaller planets too — including two of the most common types of planets found in the Milky Way.

Neither of the planets, GJ 436b and GJ 1214b, are quite like anything found in our solar system. GJ 436b is a warm Neptune that’s slightly larger than Neptune and much closer to its host star. Thus unlike our own distant, gassy ice giant, GJ 436b’s surface temperature sits about a blistering 980 degrees Fahrenheit. It is 36 light-years from Earth in the constellation Leo. GJ 1214b, a super-Earth whose radius is 2.7 times that of our home planet, sits about 40 light-years away in the constellation Ophiuchus.

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