According to NASA, there must be over 100,000 objects with a diameter of one to ten centimeters floating around space. The number of fragments less than one centimeter could be in the millions. The U.S. Space Command is aware of the threat of an orbital impact during space missions and monitors this junk constantly. The agency estimates that might be more than 3,000 satellites orbiting Earth. In February 2008, for example, the United States blew up a satellite that contained toxic fuel. It was exploded over the Pacific Ocean so that it could not fall and harm humans. Some scientists