Drone’s view of Sunday’s SpaceX rocket landing

A pair of European-built, NASA-backed research satellites set for launch Tuesday from California will extend 15 years of global gravity field measurements collected by the GRACE mission before it ended last year, supplying scientists with data to help track the melting of Earth’s ice sheets and chart the impacts of floods and droughts.

SpaceX’s Falcon Heavy rocket stood atop historic launch pad 39A on Monday, one day before 27 kerosene-fueled rocket engines will dispatch the towering rocket into space with nearly 5 million pounds of thrust.

SpaceX launched a Falcon 9 rocket Friday at 5:39 p.m. EDT (2139 GMT). The commercial booster is hauling up the Thaicom 8 television broadcasting satellite from Cape Canaveral. The rocket’s first stage successfully landed on SpaceX’s recovery platform in the Atlantic Ocean.