Previously scheduled for Thursday, this event has been rescheduled for Friday, same time. Exploration Flight Test 1, Orion's first flight, will send an uncrewed spacecraft 3,600 miles into space. As part of the test flight, Orion will return to Earth at a speed of approx. 20,000 mph, generating temperatures near 4,000 degrees Fahrenheit. A system of 11 parachutes will slow it down for a splashdown in the Pacific Ocean after 4.5 hours in orbit.