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A comet is about to fly by Mars: Here's everything you need to know
A comet is about to fly by Mars: Here's everything you need to know

On Sunday, a comet the size of a mountain will brush past Mars, passing just 87,000 miles away 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 Mars in about 1 million years. The Mars-grazing comet is called C/2013 A1, but you can call it Comet Siding Spring for short. Siding Spring is the name of the Australian observatory from which it was first spotted.  Scientists say the nucleus of the comet is between half a mile and 5 miles wide, and if it is similar to the nucleus of other comets, it likely has the tensile strength of meringue in...

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