On Feb. 14, 2011, NASA’s Stardust-NExT (New Exploration of Tempel 1) mission will encounter Comet Tempel 1, providing a unique opportunity to measure the dust properties of two separate comets (Wild 2 and Tempel 1) with the same instrument for accurate data comparison. The encounter also will provide a comparison between two observations of a single comet, Tempel 1, taken before and after a single orbital pass around the sun.
NASA’s Stardust spacecraft will fly within 200 kilometers (about 124 miles) of Comet Tempel 1 on Feb. 14, 2011, at about 8:36 p.m. PST.

The Stardust-NExT mission is a low-cost use of an in-flight spacecraft redirected to a new target. Prior to its tasking for Tempel 1, the Stardust spacecraft successfully flew through the cloud of dust surrounding the nucleus of comet Wild 2 in January 2004. The particles of cometary material gathered during this flyby were then returned to Earth aboard a sample return capsule that landed in the Utah desert in January 2006.
I wish I could understand all this. seems magnificent!