CAPE CANAVERAL, FL (WAFF) - The NASA launch team gave the "go" for tanking and fueling began on the Delta IV Heavy rocket around 3:30 a.m. ET.
The Delta IV H, built in Decatur, Alabama, will lift Orion off the launch pad and into space. The launch is set for 7:05 a.m. ET on Friday, 24 hours after the first launch window opened on Thursday.
Forecasters lowered the launch forecast for Friday to 40 percent go.
Thursday's launch was scrubbed after a string of delays. High wind delayed the first two attempts and a boat was believed to be in the "no go" area initially. Then a series of problems with valves caused the launch to be scrubbed just before the launch window closed at 9:44 a.m. ET.
The Delta IV Heavy rocket will launch Orion into space from Launch Complex 37 at Cape Canaveral Air Force station. After circling Earth twice to test the spacecraft's critical systems, Orion will splashdown in the Pacific Ocean near San Diego.
EFT 1 is expected to last 4.5 hours and Orion will be retrieved from the Ocean by a Navy boat.
Orion's heat shield will be sent back to Huntsville, Alabama for testing.