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Comet Siding Spring (C/2013 A1)

Comet Siding Spring (C/2013 A1)
Comet Siding Spring (C/2013 A1) is racing toward Mars for a close encounter on October 19, 2014.

Comet Siding Spring (C/2013 A1) is racing toward Mars for a close encounter on October 19, 2014.