This Rocks! (no pun intended)

NASA's Stardust spacecraft is headed home after it's flyby mission to collect samples from a comet.

An estimated 10 million particles of dust traveling at six times the speed of a rifle bullet blasted the spacecraft as it flew past the comet Wild 2, members of the mission said. Stardust shot 72 black-and-white pictures of the dark nucleus of Wild 2 during Friday's swoop past the frozen ball of ice and rock.

To get its unprecedented close-ups, Stardust flew through the comet's coma, the fuzzy shroud of gas and dust that envelops it. The images show features on the comet's pocked surface as small as 66 feet across, seen from about 150 miles away, said Ray Newburn, a member of the Stardust imaging team.

The largest of the particles to strike Stardust's twin bulletproof bumpers was probably the size of a .22-caliber round, scientists said. The spacecraft fired its thrusters about 1,200 times to compensate for the battering it received during the flyby, said Benton Clark, of Lockheed Martin Space Systems, the probe's builder.

Stardust is expected back in 2006. There's lots of good information and more links about the mission and spacecraft at Chris Hall's blog.