Live coverage: Soyuz crew arrives at International Space Station

Slung under the belly of a specially-equipped carrier airplane, a Northrop Grumman Pegasus rocket took off Wednesday from Vandenberg Air Force Base on a two-day trek to a remote U.S. military test site in the Pacific Ocean, where crews will ready the air-dropped booster for launch of a NASA research satellite next week.

A SpaceX Falcon 9 rocket arrived at launch pad 39A on Florida’s Space Coast on Sunday, a day before liftoff with a powerhouse Inmarsat communications satellite designed to spread broadband beams connecting airline passengers, maritime crews and U.S. and international military units with Internet and data services.

SpaceX’s first Falcon Heavy rocket, made up of two previously-flown Falcon 9 boosters and a beefed up central core stage, made the trip to launch pad 39A at NASA’s Kennedy Space Center in Florida and was raised vertical Thursday for testing ahead of its first liftoff next month.