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  When Worlds Collide

  Watch as two planets, one the size of the moon and the other as large as Mercury, smash into each ...

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  Star Trek's Warp Drive: Are We There Yet?

  Marc Millis, former head of NASA's Breakthrough Propulsion Physics ...

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  How the Sun Will Die: And What Happens to Earth

  Five or so billion years from now, Earth's present orbit won't be a ...

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  Kibo: Japan's Hope in Space - Part 1

  Watch the evolution of Japan's first space lab Kibo, which means Hope ...