Cassini Mission:
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The Cassini-Huygens mission is a collaboration between NASA, ESA (European Space Agency), and the Italian Space Agency.
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The mission was launched in 1997.
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The spacecraft arrived in the Saturn system in 2004 and ended its mission in 2017.
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Significance: Cassini-Huygens was a mission of firsts. First to orbit Saturn. First landing in the outer solar system. Also, first to sample an extra terrestrial ocean.