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Here is an article with photos about how NASA used a nanostructure called Aerogel to catch dust particles in a comet's tail (and more). Its really interesting to take a fact (like this gel is a nano-structure of silicone that is spongelike and contains over 99% air) and actually see it and see how it works...check it out. I'll post the photo of the stuff in the album, too.
www.nasa.gov/mission_pag...l-index.html
www.nasa.gov/mission_pag...l-index.html
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