The conception of the newly discovered planet MOA-2007-BLG-192Lb orbiting a brown-dwarf "star" that's only 6 percent as massive as our sun. Theory suggests that the three-Earth-mass planet is made primarily of rock and ice. Observational and theoretical studies of brown dwarfs reveal that they have a magenta color due to absorption by elements such as sodium and potassium in their atmospheres. It almost fits the profile of our planet Earth.
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