NASA's Swift observatory, first launched in 2004, is expected to re-enter Earth's atmosphere after an unsuccessful rescue attempt. The telescope, operating for more than two decades, will disintegrate upon re-entry. Majority of the debris will combust in the atmosphere. Experts forecast that the impact zone may encompass over 80% of Earth's surface. Authorities are keeping a close watch to evaluate risks to inhabited regions. The exact location of impact has not been determined. NASA's Swift Observatory Falling to Earth: Who Is Responsible If Debris Results in Harm?