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This is Scientific American 60-Second Space. I'm Clara Moskowitz. Got a minute?

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Dust is a major annoyance for most of us, but to scientists it can be precious.

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Over the summer researchers identified seven specks of dust returned to Earth by the Stardust spacecraft,

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which spent 12 years in space and tried to collect samples from the wake of a comet.

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The seven dust motes may come from interstellar space.

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Determining their true origin, however, has proven problematic.

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Three of the microscopic grains are locked in a foam material called aerogel, from the outside covering of Stardust.

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Aerogel is great at catching the particles, but scientists have not yet figured out a good way to extract the grains without damaging them.

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For now, the grains, and the researchers, are stuck.

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The other four interstellar dust candidates were found in the grid of aluminum foil that held the aerogel.

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When the grains hit, the foil melted and formed miniature craters.

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Scientists chemically analyzed two of these craters, but the findings are inconclusive.

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The impactors might come from interstellar space, or they could be local.

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Unfortunately, the analysis destroyed those two grains.

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And the other two foil-embedded candidates were lost while being transported between labs.

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Scientists hope to find still more microscopic particles in the Stardust collector.

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And they have keep NASA cleaning crews from doing any dusting.

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Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.

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