Now that the fireworks are over, scientists are sorting through what was learned from the Deep Impact collision with Comet Tempel 1 on July 4th.

“It looks like we got a pretty good pop,” Pete Schultz from Brown University told yesterday.

Although Deep Impact’s 820-pound impactor struck the comet’s surface at approximately a 25-degree angle, it was still able to kick up an impressive plume of dust.

The preliminary images and data indicate the comet has a cratered surface that is too soft to be made of ice, once thought to be the main component of comets. The impactor-induced crater was not visible directly due to the thick cloud of dust, but researchers estimate it to be at least 330 feet (100 meters) wide.

“The major surprise was the opacity of the plume the impactor created and the light it gave off,” said Michael A’Hearn of the University of Maryland. “That suggests the dust excavated from the comet’s surface was extremely fine, more like talcum powder than beach sand.”

Hot vapor containing water and carbon dioxide was detected by Deep Impact’s flyby instrument. Researchers continue to comb through the mountains of data looking for other comet ingredients, while space- and ground-based telescopes monitor the collision aftermath from afar.

At 1:52 a.m. Eastern time, July 4, the impactor smashed into the 3-mile by 7-mile comet at a speed of 6.3 miles per second (23,000 mph). The impact excavated many thousands of tons of material.

More here.