Six-ton satellite falls to Earth
Nasa has said it is not aware of any injuries or property damage from a defunct six-ton satellite that has fallen from the sky.
The agency posted on its website that the spacecraft crashed through the atmosphere early on Saturday somewhere over the north Pacific Ocean. An exact location is not known.
Most of the satellite is believed to have burned up on entering Earth's atmosphere.
The Upper Atmospheric Research Satellite (UARS) was Nasa's biggest spacecraft to tumble out of orbit, uncontrolled, in 32 years.
UARS was launched aboard space shuttle Discovery in 1991. Nasa decommissioned the satellite in 2005, after moving it into a lower orbit that cut its life short by two decades.
Pieces of space junk often re-enter the atmosphere but no injuries have ever been reported from such incidents.