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Updated by Shawna McDermott on Oct 08, 2018
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Space

Overview | Planets – Solar System Exploration: NASA Science

The definition of a planet is the subject of vigorous scientific debate.

Do-It-Yourself | Kids – Solar System Exploration: NASA Science

NASA’s real-time encyclopedia of the robotic exploration of our solar system.

NASA Astronauts Homepage

NASA.gov brings you the latest images, videos and news from America's space agency. Get the latest updates on NASA missions, watch NASA TV live, and learn about our quest to reveal the unknown and benefit all humankind.