Atlas/Cygnus pre-launch news conference

Orbital ATK’s seventh Antares rocket stands ready for launch with a Cygnus supply ship Saturday on a two-day flight to the International Space Station.

A United Launch Alliance Atlas 5 rocket lifted off from Cape Canaveral at 4:18 p.m. EDT (2018 GMT), following a delay of more than an hour to troubleshoot a ground hydraulics controller. The Atlas 5 launched with the U.S. military’s sixth Advanced Extremely High Frequency strategic communications satellite.

NASA has a builder to construct a five-ton spacecraft to catch up with the aging Landsat 7 Earth observation satellite and refuel it in 2020, employing robotic tools mastered in years of rehearsals on the International Space Station.