Comets happen all the time, but ISON is special: At 4.5 billion years old, it's still "dynamically new" - meaning it's never passed the sun before. On Thanksgiving day, the comet will come into its closest approach to the sun, which could mean a spectaular holiday lightshow visible to the naked eye.
NASA is hosting a Google Hangout on Thursday tracking its progress. Check it out here if you're interested:
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More images and video here:
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And hey, at least it's not this guy again -
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