Live coverage: Vega rocket launches with LISA Pathfinder

Arianespace’s launch team loaded an Ariane 5 rocket full of super-cold liquid hydrogen and liquid oxygen propellants Tuesday for a fiery sunset blastoff from French Guiana at 2139 GMT (4:39 p.m. EST) with two European-built television broadcast satellites for Brazil and Indonesia.

After making landfall in South Florida, Hurricane Irma moved north over the state before losing strength and being downgraded to a tropical storm. NASA safety officials report the Kennedy Space Center lost electricity and water pressure during the storm, but a team of emergency personnel at the spaceport is safe.

With three space station fliers heading home Sunday after a 168-day mission, three fresh crew members made final preparations for launch three days later to boost the lab’s crew back to six in a rapid-fire rotation that will prevent any major interruption of research activity.