Kepler-138b: First Exoplanet Smaller Than Earth to Have Its Mass and Size Measured

A team of astronomers have measured the mass and size of the smallest exoplanet yet, a Mars-sized planet named Kepler-138b orbiting a red dwarf star about 200 light years from Earth. Determining the size of an Earth-size exoplanet by the amount of starlight it blocks hundreds of light-years away once was the realm of science […]
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