At 5:28 PM EST on Jan. 11, 2007, a satellite arced over southern China. It was small — just 6 ft. long — a tiny object in the heavens, steadily bleeping its location to ground stations below, just as it had every day for the past seven years. And then it was gone, transformed into a cloud of debris hurtling at nearly 16,000 mph along the main thoroughfare used by orbiting spacecraft.
