Crews work a controlled burn in Geneva, Fla., in December. The state's forest service has rolled out a system to track equipment during fires, and hopes it can eventually be used to pinpoint firefighters, too. Joshua C. Cruey/Courtesy of the Orlando Sentinel hide caption

itoggle caption Joshua C. Cruey/Courtesy of the Orlando Sentinel

An artist's rendering of the European Space Agency's GOCE satellite, which is now out of fuel and expected to fall to Earth sometime Sunday or early Monday. European Space Agency/AOES Medialab hide caption

itoggle caption European Space Agency/AOES Medialab

A rendering of objects currently in Low Earth Orbit (not illustrated to scale). According to NASA, "approximately 95 percent of the objects in this illustration are orbital debris, i.e., not functional satellites." NASA hide caption

itoggle caption NASA