Artist's conception of the newly discovered planet <a href="https://en.wikipedia.org/wiki/MOA-2007-BLG-192L_b" class="extiw" title="en:MOA-2007-BLG-192L b">MOA-2007-BLG-192L b</a> orbiting a brown dwarf "star" with a mass of only 6 percent of that of the Sun. Theory suggests that the 3-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. If the host star has a mass of 9 percent of that of the Sun, at the other end of the margin of error for the new microlensing data, the star would be a red dwarf about 100 times brighter than the brown dwarf, but 1000 times fainter than the Sun.
NASA's Exoplanet Exploration Program
2008
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