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URL
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http://www.nasa.gov/
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http://www.hq.nasa.gov/
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http://www.jpl.nasa.gov/
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http://www.jsc.nasa.gov/
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http://www.ksc.nasa.gov/
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http://www.ssc.nasa.gov/
Canadian Space Agency
http://www.space.gc.ca/
European Space Agency
http://www.esrin.esa.it/