Live coverage: Dragon supply ship back on Earth

SpaceX’s Falcon 9 rocket is awaiting liftoff from Cape Canaveral’s Complex 40 launch pad as soon as Tuesday after three scrubs caused by propellant loading problems and a boat that strayed into restricted waters in the Atlantic Ocean.

A hefty communications satellite built by Boeing and launched by SpaceX Monday night from Cape Canaveral is on the way to a lofty perch more than 22,000 miles over the Pacific Ocean, where a startup named Kacific will use it to link remote populations seeking connectivity for health clinics, schools and other basic services.

A Russian Soyuz rocket made a railroad journey Wednesday to its launch pad in Kazakhstan, two days before blastoff with a crew of three spaceflight veterans from the United States, Italy and Russia heading for the International Space Station.