Watch the Falcon 9 launch from pad 39A

Northrop Grumman called off the launch of an Antares rocket and a Cygnus space station cargo freighter Thursday night on Virginia’s Eastern Shore, the third aborted countdown in less than 24 hours for three different U.S. rockets.

Northrop Grumman’s Antares rocket will deliver a Cygnus supply ship into orbit Wednesday to begin a day-and-a-half pursuit of the International Space Station.

SpaceX plans to launch an unmanned test model of the company’s Dragon crew capsule Wednesday on a whirlwind 107-second flight through the skies over Cape Canaveral.