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第1段

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

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

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

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

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5 .The seven dust motes may come from interstellar space.

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6 .Determining their true origin, however, has proven problematic.

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

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8 .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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9 .For now, the grains, and the researchers, are stuck.

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

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

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

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

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14 .Unfortunately, the analysis destroyed those two grains.

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

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

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

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

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