A high-resolution photo of the comet's nucleus shows a cloud of individual particles.

Credit: NASA/JPL-Caltech/UMD

It's a snowstorm. NASA says the particles range in size from a golf ball to a basketball and are porousand fluffy.

Credit: NASA/JPL-Caltech/UMD

Medium resolution images confirm the cloud's existance.

Credit: NASA/JPL-Caltech/UMD

In this image a star's straight path is marked in red while individual snow particles have a more random movement.

Credit: NASA/JPL-Caltech/UMD

If you've got red-blue tinted glasses (red in front of the left eye) you can see this in 3D. Circles indicate individual particles.

Credit: NASA/JPL-Caltech/UMD

Infrared scans show carbon dioxide, dust, and ice from the same locations of the nucleus. Water vapor is seen in a different region.

Credit: NASA/JPL-Caltech/UMD

EPOXI's last mission had it fly past comet Tempel 1 and send a loaded impactor to explode on its surface. Temple 1 is about 5 time larger than Hartley 2 is about 1.4 miles long while Tempel 1 is about 4.7 miles long. At the time, EPOXI was called Deep Impact but was renamed after it was assigned a new mission.

Credit: NASA/JPL-Caltech/UMD

This image was taken about 500 miles from the comet. The neck is about 0.25 miles wide.

Credit: NASA/JPL-Caltech/UMD

An artist's drawing of EPOXI closing in on Hartley 2.

An artist shows what Deep Impact must have looked like as it flew past Tempel 1 in 2005.