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Article about the matter that can't be detected by its emitted radiation but whose presence can be inferred from gravitational effects on visible matter such as stars and galaxies.
http://en.wikipedia.org/wiki/Dark_matter
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There is much more detail behind these selections. "According to Karl Popper, the true scientist is someone who tries to contradict ... rwgray@rwgrayprojects.com ...
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Access point to the vast amount of information about NASA's human exploration and development of space. Learn about the latest Space Shuttle and International Space Station missions.
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NASA's home for all Mars missions past, present, and future. Aims to determine if life ever arose on Mars, characterize its climate and geology, and prepare for human exploration.
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... a science demonstration, and we'll enter it into our competition and add it to the best online demonstration database the world has ever seen. ...
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Brings together industry, government, academia, and research laboratories to share findings in the research and development of new materials of technological importance.
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