A Mars-size planet about 200 light-years from our solar system has turned out to be the lightest known alien world orbiting a normal star, researchers say. It is the first exoplanet smaller than Earth with both its mass and size measured.
A Mars-size planet about 200 light-years from our solar system has turned out to be the lightest known alien world orbiting a normal star, researchers say. It is the first exoplanet smaller than Earth with both its mass and size measured.
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