Video: Press conference following Falcon launch and landing

A forecast of low ceilings, thick clouds and rainy weather Thursday has led NASA and Northrop Grumman officials to push back the launch of an Antares rocket and a space station-bound supply ship from Virginia’s Eastern Shore to Friday morning.

A spaceship designed to ferry astronauts into orbit by 2017 is set for a major test Wednesday, when SpaceX plans to blast the capsule away from Cape Canaveral on a mile-high demo flight to simulate the craft’s ability to protect occupants in the event of a catastrophic rocket mishap on the pad.

Ground crews plan to load the final cargo into SpaceX’s Dragon supply ship Saturday after the capsule’s Falcon 9 rocket booster briefly fired up on the launch pad at Cape Canaveral for a flight readiness check.