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A spent science satellite that had measured Earth's gravity field reentered the atmosphere on Sunday night and mostly disintegrated as planned, the European Space Agency (ESA) said Monday.
An estimated 25 percent of the one-tonne GOCE satellite reached the Earth's surface over the southernmost regions of the South Atlantic ocean, it said, and "no damage to property has been reported".
Scientists had predicted that several dozen fragments of GOCE, totalling some 200 kilogrammes (440 pounds) -- about the weight of car engine -- would survive contact with the atmosphere.
GOCE "is only a small fraction of the 100-150 tonnes of man-made space objects that reenter Earth's atmosphere annually," said Heiner Klinkrad, head of ESA's space debris office, said in a statement.
"In the 56 years of spaceflight, some 15,000 tonnes of man-made space objects have reentered the atmosphere without causing a single human injury to date."
The Gravity Ocean Circulation Explorer (GOCE) satellite was placed in orbit in 2009 on a mission to monitor variations in gravity and sea levels.
The sleek, finned craft's mission came to a natural end when it ran out of fuel on October 21, leaving it without power to maintain its altitude in low orbit, where there are still lingering molecules of air.
GOCE was launched in March 2009 at an altitude of 260 kilometres (160 miles) -- later lowered to 224 km -- the lowest ever for a research satellite.
The 350-million-euro ($465-million) mission has lasted twice as long as its initially-scheduled 20 months.
ESA said the satellite reentered the atmosphere around midnight GMT Sunday on a descending orbit that crossed Siberia, the western Pacific Ocean, the eastern Indian Ocean and Antarctica.
GOCE was designed and built before 2008, when international recommendations were adopted stating that a scientific satellite must be able to execute a controlled reentry, or burn up completely after its mission.