The Orbital ATK’s Cygnus commercial resupply spacecraft, named the SS Deke Slayton II, is packed up and poised for launch to the International Space Station.

Final preparations began this weekend at NASA’s Stennis Space Center in Mississippi to load super-cold liquid hydrogen and liquid oxygen into the massive core stage of the Space Launch System heavy-lift rocket for the first time as soon as Monday.

Another batch of 52 Starlink satellites launched late Tuesday from Vandenberg Space Force Base in California, on the way to join SpaceX’s fleet of more than 4,000 spacecraft beaming broadband signals around the world.