A comet will be swinging by Mars this Sunday, and eager astronomers say they're ready for the "once-in a lifetime event."
Comet C/2013 A1, or 'Sidi...
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By: Joe Rao
Published: 03/05/2013 07:37 AM EST on SPACE.com
A newfound comet is apparently on course to have an exceedingly close call with the pl...
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