Comet Siding Spring flies past Mars

Comet Siding Spring sailed past Mars on Sunday, coming 10 times closer to the Red Planet than any comet on record has come to Earth.

At the time of the comet's closest approach at 2:27 p.m. ET, it was just 87,000 miles from Mars. That's less than...

Comet to pass near Mars Sunday

A comet the size of a mountain will brush past Mars Sunday, passing just 87,000 miles from the red planet.

That's about one-third the distance between the Earth and the moon, and scientists say it is likely closer than any comet has gotten to ...