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It's a golden age for planet hunters: NASA's Kepler mission has identified more than 3,...
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Can scientists unravel the mysterious phenomena that lurk between Earth and space?

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For decades, the assassination of John F. Kennedy has fueled dark rumors of conspiracies...
NOVA  ·  Episode 4024

Asteroid: Doomsday or Payday?


Will future asteroids trigger massive extinctions—or be mined for precious minerals?

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