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

50 Years of Pictures From Space

For half a century, the U.S. has been sending probes into deep space—and for half a century the appropriately named Deep Space Network has been keeping in touch...

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Photo Essays

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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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