Sunday, August 28, 2011
From what I've read, rounded things that look like they were partly melted are good candidates. Here is a less rounded one that ended up on the slide of the four that I saved. I don't know how it got there, as I only intentionally transferred three to it, if memory saves. Maybe it accidentally got carried there. It looks too rough-edged to be a micrometeorite. However, I've also read that they can avoid atmospheric melting by being small, so maybe rough-edged things count as candidates, too. It, too, has a nice shine to it, though the photo doesn't show it.
If you try to view these with bright-field microscopy, of course you just get black silhouettes. What I did is I taped a bright LED flashlight to the microscope, pointing at the sample, and then I took timed exposures, holding the camera to the eyepiece (sometimes with some sort of adapter to keep the camera in place). For the second two photos, I found a way of adding more light. I took the microscope outdoors, and then reflected sunlight onto the slide with a mirror (actually, a hard drive platter--they make lovely mirrors). The photos were taken with point and shoot cameras hand-held to microscope eyepieces, with some loose-fitting adapters to make it easier. The first photo was with a Sony P100 through the 10X Huygens eyepiece that the microscope came with. The second and third photos were with a Canon G7 through a Rini 30mm telescope eyepiece, using my home-made telescope-to-microscope eyepiece adapter. Update: I wish I knew how to better identify micrometeorites. The very round one may not be one--see this article.