Nasa's UARS satellite plunges over Pacific
24 September 2011 Last updated at 10:00 BST
Nasa says its six-tonne UARS satellite penetrated the atmosphere over the Pacific Ocean early on Saturday.
The Upper Atmosphere Research Satellite (UARS) is the largest American space agency satellite to return uncontrolled into the atmosphere in about 30 years.
The BBC's Andy Moore has more details.