Video: Liftoff of Delta 4 with WGS 7

Two satellites designed to beam radio and television broadcasts, Internet connectivity and other communications services across Russia have arrived at a launch pad at the Baikonur Cosmodrome in Kazakhstan for liftoff Thursday on the first flight of a Russian Proton rocket this year.

The United Launch Alliance Atlas 5 rocket that will hurl the four MMS satellites into a highly elliptical Earth orbit on March 12 has completed its basic build up at Cape Canaveral’s Complex 41 Vertical Integration Facility.

SpaceX’s second Falcon Heavy rocket lifted off Thursday with the Arabsat 6A communications satellite. The world’s most powerful operational launcher lifted off from pad 39A at NASA’s Kennedy Space Center in Florida at 6:35 p.m. EDT (2235 GMT), and its three first stage boosters landed less than 10 minutes later — two back at Cape Canaveral and one on a drone ship at sea.