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Some 14 minutes later, it will make its closest approach to the comet nucleus, passing 310 miles below it.

Hartley 2 is the fifth comet nucleus visited by a spacecraft.

The comet nucleus was estimated to be about 0.9 km in diameter.

The comet nucleus is estimated at about 5.2 km in diameter.

Being at least 130 km in diameter, it is unusually large for a comet nucleus.

That fit with the idea of a small comet nucleus, still rich in volatiles.

These observations provide an unprecedented opportunity to study the demise of a comet nucleus.

The comet nucleus is estimated to be 4.5 kilometers in diameter.

These pictures have told us that comet nuclei are far more complex than we ever imagined.

This investigation would provide the first look at the changes to a comet nucleus produced after a close approach to the sun.