1: Number of manmade satellites in Earth’s orbit on Oct. 5, 1957, the day after Sputnik was launched by the Soviet Union

2,944: Estimated number of working satellites in orbit, as of June 29, 2005

6,408: Estimated bits of space junk in orbit

42: Percentage of all working satellites and space junk put in orbit by the United States

5,622: Estimated mass, in tons, of objects in Earth’s orbit

Sources: Wikipedia and NASA