
Meanwhile, I heard that you can collect micrometeorites from your roof. Just put some strong magnets in your rain gutter and after a good rain, clean the magnets and look at the dust under a microscope. Well it hadn't rained all summer and there was a good rain forecast, so I put some small neodymium magnets in the rain gutter. The next morning, I pulled them off the roof and dried them in a dish on a hot plate. I had bought a usb microscope at a yard sale a couple years ago that works quite well. I spread the dust from the magnets on a slide and placed it under the microscope and there they were! Micrometeorites or, as scientists call them, "Cosmic Spherules".
The picture above is from that dust that was washed off my roof magnified 200x. Click on it to make it bigger.