10 firsts from NASA's first 50 years
From sending humans to the moon to building a home in space
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Related: Human spaceflight , Solar System
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Headlines
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An unseen planet at solar system's edge?
A planet four times the size of Earth may be skirting the edges of the solar system beyond Pluto, according to new research. Too distant to be easily spotted by Earth-based telescopes, the unseen planet could be gravitationally tugging on small icy objects past Neptune, helping explain the mystery of those objects' peculiar orbits.
- Sun leaves no shock wave in its wake
- Scientists spot unseen planet in Kepler scope data
- Last chance to see Venus transit — until 2117
- Obama checks up on astronauts — and their robot
- Husband: Giffords would be OK with flight decision
- No leaks, immediate signs of cracking on Discovery
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An unseen planet at solar system's edge?
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