By Elizabeth HowellSpace.comNASA's Spitzer Space Telescope could be used to find Mars-size alien planets orbiting strange "failed stars" known as brown dwarfs, according to a new proposal by a multinational astronomy team.The group, led by a postdoctoral researcher at MIT, proposes to use the venerable observatory to find small, rocky exoplanets around brown dwarfs, which are larger than planets b...
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