September 21, 2009
Take a look at this photograph:
(Photo 1) Taken at 200 times life-size, the semi-transparent line is a human hair, about 100microns wide. (200x)
The metallic spheres above are about 200 to 500+ microns in diameter. Notice that the majority are near-perfect spheres and highly reflective. They are probably NOT micrometeorites, but contamination from man-made sources.
Other images I have show similar microspheres less than 50 microns, the largest are more than 600 microns. Some are colored differently (probably rust) and with rough surfaces. While I cannot confirm (this requires an electron microscope) that these are micrometeorites I do have a photo from the Defense Department showing micrometeorites on page 3 of this article.
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As micrometeorites enter the atmosphere at 20,000 miles an hour, they melt into spherical shapes and gradually descend through the atmosphere in the wind, or commonly in water droplets. Likewise do metallic particles when heated to high temperatures in low-gravity environments.
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