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The Asteroid That Thought It Was a Comet

The difference between an asteroid and a comet was always thought fixed—but now a new paper says the two celestial bodies may be more similar than we thought

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Time.com Specials

Rocket Science: 10 Great Astronaut Movies

The launch of ‘Gravity’ has us looking back at a century’s worth of movies about the men and women who explore our solar system

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