Ultrasmall Space Junk Can Be an Invisible Satellite Killer. Scientists Are Learning How to Track It

An ambitious U.S. government program is working to detect and track millions of tiny space junk pieces—down to the size of a sand grain—throughout low-Earth orbit and beyond

 An ambitious U.S. government program is working to detect and track millions of tiny space junk pieces—down to the size of a sand grain—throughout low-Earth orbit and beyond  Scientific American Content: Global