A comet from the outer reaches of the solar system is due to give Mars a close shave on Sunday (Oct. 19), and you can watch the flyby live online.
While Comet Siding Spring (also called Comet C/2013 A1) isn't easy to spot from Earth, a couple different astronomy organizations will be tracking the comet as it flies 87,000 miles (139,500 kilometers) from Mars at 2:27 p.m. EDT (1827 GMT) on Sunday. The comet will fly three times closer to Mars than the moon is to Earth. The Slooh Community Observatory will host two Comet Siding Spring webcasts on its website (http://www.slooh.com/) at 2:15 p.m. EDT and 8:30 p.m. EDT (1815 GMT and 0030 Oct. 20 GMT).
You can watch the comet webcasts live on Space.com, as well as a view from the Virtual Telescope Project will also cover the comet's close approach Sunday (Oct. 19) beginning at 12:45 p.m. EDT (1645 GMT). [See amazing images of Comet Siding Spring]
via Vurtual Telescope Project