NASA astronaut Rex Walheim excited about Orion test flight

Watch a video replay of NASA’s Parker Solar Probe lifting off from Cape Canaveral Air Force Station’s Launch Complex 37 atop a United Launch Alliance Delta 4 Heavy on August 12, 2018.

A dramatic automatic abort 7.5 seconds before the planned liftoff of a United Launch Alliance Delta 4-Heavy rocket Saturday night kept the towering launcher on the pad at Vandenberg Air Force Base, California, with a top secret spy payload for the National Reconnaissance Office.

The first of up to seven United Launch Alliance missions lifted off Jan. 19 from Vandenberg Air Force Base in California, where a Delta 4-Heavy launcher fired into orbit with 2.1 million pounds of thrust from three hydrogen-fueled RS-68A main engines with a U.S. government spy satellite.