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This is Scientific American's 60-Second Space. I'm Clara Moskowitz Got a minute?

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Solar system conspiracy theorists have long harbored suspicions that a hidden extra planet or dwarf star lies beyond the orbit of Pluto.

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As a planet, it's been called Tyche or simply Planet X.

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As a star, Nemesis.

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But an exhaustive search has found no hints of this long-rumored object.

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NASA's Wide-Field Infrared Survey Explorer has scanned the entire sky in infrared light twice,

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and ruled out any hidden bodies larger than Saturn out to 10,000 times the distance from the Earth to the sun.

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Furthermore, it found no evidence for anything bigger than Jupiter out to 26,000 times the Earth-sun distance.

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Pluto, for comparison, lies only 40 times farther from the sun than Earth.

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The finding deals a blow to theories that a Planet X- or Nemesis-type object may have caused periodic mass extinctions on Earth.

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Some theorists have mused that a hidden planet might have swept through bands of comets in the solar system, sending them crashing into Earth.

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Now it seems that for such mass species die-offs, the fault lies not in the stars.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm Clara Moskowitz.

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