OneWeb’s next 36 internet satellites stacked on top of a Soyuz rocket lifted at 10:47 p.m. EDT Wednesday (0247 GMT Thursday) from the Vostochny Cosmodrome in Russia’s Far East.

The 8-million-pound mobile service tower is retracted from around the Atlas 5 rocket, revealing the 19-story-tall vehicle for liftoff from Vandenberg Air Force Base, California, on NROL-55.

SpaceX fueled its next Falcon 9 rocket at launch pad 39A and ignited the booster’s nine Merlin engines at sunset Thursday, passing a major step in the launch campaign leading up to liftoff of the Intelsat 35e communications satellite Sunday.