The atmosphere of a newly discovered SuperEarth --an exoplanet whose mass is between about two and ten Earth-masses--shows signs of harboring water vapor. Four Havard Smithsonisn Center for Astrophysics astronomers used the Hubble Space Telescope to probe the atmosphere around the transiting super-Earth known as GJ1214b. This exoplanet has a mass of 6.5 Earth-masses and a radius of 2.7 Earth-radii, and it orbits a small M-dwarf star (its diameter is only 21% of the Sun's).
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