Video: OA-7 Cygnus freighter departs International Space Station

A hydrogen-fueled main engine and four solid rocket boosters combined to propel a United Launch Alliance Delta 4 rocket off its launch pad at Cape Canaveral on March 15, successfully sending a U.S. Air Force communications satellite into orbit.

A solid-fueled rocket booster fired for more than two minutes in Utah on Wednesday, spewing a torrent of glowing hot flame against a hillside in a key test for the Space Launch System, a behemoth rocket NASA is developing to send astronauts on long-distance voyages into space.

SpaceX rolled the first Crew Dragon spacecraft out to a Florida launch pad Thursday for final preparations ahead of a test flight to the International Space Station.