Did the sun have an "evil twin" that wreaked havoc on Earth, perhaps obliterating the dinosaurs? 

Scientists think they can answer at least part of that question with near certainty: Yes, the sun had a twin, the Telegraph reports. Whether it was "evil" remains up in the air. 

New research out of UC Berkeley and Harvard suggests every sun in the universe is born with a fraternal twin. In fact, Earth's closest neighbor, Alpha Centauri, is a triplet system. Astronomers have long puzzled over binary and triplet solar systems and what becomes of sidekick suns, which are actually stars. And in one of space's most tantalizing mysteries, researchers have long theorized that a dwarf star dubbed Nemesis once rattled our solar system so fiercely that it unleashed killer comets toward Earth, obliterating the dinosaurs.

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