A brown dwarf star may be circling our sun and causing deadly comets to bombard the earth, resulting in mass extinctions which have occurred every 26-million years. NASA scientists have nicknamed the IR-emitting star Nemesis and expect to locate it with a heat-seeking telescope that began scanning skies in January. Nemesis is thought to pull icy bodies out of the more distant Oort Cloud and hurl snowballs toward earth in the form of comets, causing devastation similar to the asteroid that wiped out dinosaurs 65-million years ago.
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