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Comet C/2013 A1 Siding Spring

Comet C/2013 A1 Siding Spring
Comet C/2013 A1 Siding Spring NASA's NEOWISE mission captured images of comet C/2013 A1 Siding Spring, which is slated to make a close pass by Mars on Oct. 19, 2014. The infrared pictures reveal a comet that is active and very dusty even though it was about 355 million miles (571 million kilometers) away from the sun on January 16, 2014, when this picture was taken. NASA / JPL-Caltech