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![](https://webarchive.library.unt.edu/eot2008/20081024220908im_/http://www.nsf.gov/images/x.gif) Press Release 08-093 Small Planet, Small Star
![](https://webarchive.library.unt.edu/eot2008/20081024220908im_/http://www.nsf.gov/images/greenlineshort.jpg)
Newly discovered extrasolar planet is the smallest known and has smallest host star
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![Artist's conception of the newly discovered planet MOA-2007-BLG-192Lb orbiting its star.](https://webarchive.library.unt.edu/eot2008/20081024220908im_/http://www.nsf.gov/news/mmg/media/images/small_planet_f.jpg) |
Artist's conception of the newly discovered planet MOA-2007-BLG-192Lb 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.
Credit: NASA's Exoplanet Exploration Program |
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![Artist's conception of the newly discovered planet orbiting a brown dwarf star.](https://webarchive.library.unt.edu/eot2008/20081024220908im_/http://www.nsf.gov/news/mmg/media/images/small_planet_still_f.jpg) |
View video David Bennett, associate professor of physics at the University of Notre Dame, discusses the most recent extrasolar planet discovery using the microlensing method.
Credit: National Science Foundation / University of Notre Dame
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![Illustration of gravitational microlensing.](https://webarchive.library.unt.edu/eot2008/20081024220908im_/http://www.nsf.gov/news/mmg/media/images/microlens_still_f2.jpg) |
View video This animation explains gravitational microlensing.
Credit: Trent Schindler, National Science Foundation
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![Illustration showing the signature distortion caused by gravity.](https://webarchive.library.unt.edu/eot2008/20081024220908im_/http://www.nsf.gov/news/mmg/media/images/microlens_disc_still_f1.jpg) |
View video This animation explains how gravitational microlensing detects planets.
Credit: Andrew Williams, University of Western Australia / Trent Schindler, National Science Foundation
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