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1 .This is Scientific American's 60-Second Space. I'm Clara Moskowitz Got a minute?
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2 .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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3 .As a planet, it's been called Tyche or simply Planet X.
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4 .As a star, Nemesis.
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5 .But an exhaustive search has found no hints of this long-rumored object.
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6 .NASA's Wide-Field Infrared Survey Explorer has scanned the entire sky in infrared light twice,
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7 .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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8 .Furthermore, it found no evidence for anything bigger than Jupiter out to 26,000 times the Earth-sun distance.
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9 .Pluto, for comparison, lies only 40 times farther from the sun than Earth.
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10 .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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11 .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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12 .Now it seems that for such mass species die-offs, the fault lies not in the stars.
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13 .Thanks for the minute, for Scientific American's 60-Second Space. I'm Clara Moskowitz.
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