Video: Change of command aboard International Space Station

Officials from NASA, Orbital ATK, Wallops Flight Facility and the Commonwealth of Virginia preview Sunday night’s flight of the Antares rocket during the pre-launch news conference held on the eve of liftoff.

A commercial Northrop Grumman Cygnus supply ship berthed at the International Space Station fired its main engine for 50 seconds Tuesday in a test of the spacecraft’s ability to reboost, and possibly eventually deorbit, the massive research outpost.

Two days after becoming the first U.S. space fliers to splash down in the sea in more than 45 years, astronauts Doug Hurley and Bob Behnken on Tuesday described their fiery ride back to Earth aboard SpaceX’s Crew Dragon capsule to cap a “flawless” test flight, setting the stage for operational flights beginning later this year.