CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, NASA leaders spoke to social media participants as the Orion spacecraft and its Delta IV Heavy rocket were being prepared for launch. Speakers included NASA astronaut Rex Walheim. For more information, visit www.nasa.gov/orion Photo credit: NASA/Jim Grossman

At NASA's Kennedy Space Center in Florida, NASA leaders spoke to social media participants as the Orion spacecraft and its Delta IV Heavy rocket were being prepared for launch. Speakers included NASA astronaut Rex Walheim.