Three Questions About Comet ISON | NASA

What is so interesting about comet ISON?

There’s great interest in comet ISON for a couple of reasons.  First of all, it’s coming from the very edge of our solar system so it stills retains the primordial ices from which it formed four-and-a-half billion years ago.  It’s been traveling from the outer edge of the solar system for about five-and-a-half million years to reach us in the inner solar system, and it\’s going to make an extremely close approach to the sun and hence could become very bright and possibly a very easy naked-eye object in early December.

via Three Questions About Comet ISON | NASA.

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