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Scientists uncovered pieces of comet dust which was captured in aerogel, a sponge-like solid made of 99 percent empty space. NASA reported that the number of samples exceeded expectations.
Here's another closeup look at a cometary fragment that was caught by aerogel.
NASA has installed a live Webcam at the Stardust Cleanroom that shows the scientists working on the comet samples returned by the Stardust space probe. It can be accessed from NASA's Stardust page.