A United Launch Alliance Delta IV Heavy rocket with NASA’s Orion spacecraft mounted atop is seen as the Mobile Service Tower is rolled back, Wednesday, Dec. 3, 2014, at Cape Canaveral Air Force Station's Space Launch Complex 37, Florida. Orion is scheduled to make its first flight test on Dec. 4 with a morning launch atop the Delta IV Heavy. The spacecraft will orbit Earth twice, reaching an altitude of approximately 3,600 miles above Earth before landing in the Pacific Ocean. No one will be aboard Orion for this flight test, but the spacecraft is designed to allow us to journey to destinations never before visited by humans, including an asteroid and Mars.