Has Comet ISON broken up?

It's sure starting to look that way. This newly released photo, via NASA on Twitter, shows a comet that looks as though its lost its nucleus after a fiery encounter with the sun.

As astronomer Carl Hergenrother explains, over at ALPO, "The comet is now extremely smeared out and the brightest part of the 'coma' is no longer near the expected head of the comet but some ways down the tail."

Watch a live NASA video chat about the comet here:

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