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Rosetta is now arriving at Comet 67P.

Other comets have been analyzed to some degree (Giotto, Deep Space 1, Deep Impact, etc.)

So my question is... where I can study the up-to-date theory of comets? Much of what was previously thought (eg. dirty snowball) has been discarded now, but I haven't found a good source describing the current thinking.

Are there any firm predictions that will be tested as Rosetta studies the comet up close?

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Looks like Planetary Society intends to post timely and informative updates on the comet… as they do on other deep space probes. – Wayfaring Stranger Aug 17 '14 at 13:23

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