Photos: Delta 4-Heavy with Orion on eve of launch

The four astronauts will spend more than nine days onboard their Orion spacecraft and is poised to pass the distance record set by Apollo 13 in 1970. Liftoff from Launch Complex 39B is scheduled for Wednesday, April 1, at 6:24 p.m. EDT (2224 UTC).

A critical test-firing of NASA’s Space Launch System moon rocket in Mississippi ended just 67 seconds after it began Saturday, well short of a planned eight-minute burn that was supposed to clear the way for the space agency to finally ship the rocket’s core stage to the Kennedy Space Center in Florida for launch preparations.

Officials hailed an action-packed three-minute test flight Tuesday over Cape Canaveral that exercised the Orion spacecraft’s launch abort rocket, a key safety system on the capsule NASA is developing to carry astronauts back to the moon.