Photos: Delta 4-Heavy launch as seen from press site

SpaceX is set to launch two prototype probes Wednesday to begin testing spacecraft and antenna technology the company hopes will eventually power a network of thousands of satellites blanketing planet Earth with broadband Internet coverage.

A commercial Cygnus cargo freighter packed with 3.8 tons of medical and pharmaceutical experiments, technology demonstration hardware, CubeSats and crew provisions rode an Antares rocket into orbit from Virginia’s Eastern Shore on Wednesday afternoon on the first leg of a day-and-a-half journey to the International Space Station.

A SpaceX Falcon 9 rocket was raised vertical at Space Launch Complex 4-East at Vandenberg Air Force Base in California on Sunday ahead of a planned liftoff with Argentina’s SAOCOM 1A radar observation satellite, and the first landing of a SpaceX booster on the U.S. West Coast.