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My research centers on optical observations of space debris using ground-based and space telescopes.   How much debris is there, and what is it?  Michigan telescopes ranging in size from the 0.6-m Curtis-Schmidt telescope on Cerro Tololo to the 6.5-m Magellan telescopes are being used for these studies.  Objects the size of small iPhones can be detected at geosynchronous orbit (altitude = 36,000 km) using short exposures on the Magellan telescopes.