GOCE

GOCE an European satellite launched by the European Space Agency (ESA) to map Earth's gravity in 2009.

It made the most detailed map yet of the variations in our planet's gravity. GOCE data also helped scientists create the first high-resolution map of the boundary between Earth's crust and its mantle. The satellite's mission was supposed to end in August 2011, but its fuel consumption was much lower than expected, so the ESA kept it up in space, lowering its orbit a bit so it could get even more detailed information about small ocean features. 

Its altitude has been dropping since late October 2013, after it ran out of fuel. And crashed 11.11.2013 9.20pm (local time) over Falkands