A dead U.S. satellite is due to fall to Earth on or around September 23.
Earlier this month, NASA said the 6-ton, 20-year-old, out-of-control satellite could land anywhere between 57 degrees north and 57 degrees south of the equator -- an area covering most of the populated world.
NASA says most of the satellite will burn up during reentry, leaving about 544 kilograms of metal to impact somewhere on the surface of the Earth.
NASA says there is a 1 in 3,200 chance of the debris hitting someone.
compiled from agency reports