comet dust

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NASA Tweetup: “Holding a Cloud”

“It’s like holding a cloud,” Carol Adams (@caroladams1) of Raleigh, N.C., told me when I asked what it was like holding the small brick of aerogel. Aerogel is a silicon-based solid and 99.8 percent of the volume is empty space, making it the lightest known porous solid on Earth. NASA uses it to collect comet […]

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