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Close Encounters: Comet Siding Spring Seen Next to Mars
Latest Image: Close Encounters: Comet Siding Spring Seen Next to Mars
This composite Hubble Space Telescope image captures the positions of comet ...
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Countdown to Pluto
Latest Video: Countdown to Pluto
Eight years after it left Earth, NASA's New Horizons spacecraft is approaching Pluto. The encounter begins less than a year from now.
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