CAPE CANAVERAL, Fla. – A spectacular sunrise at NASA's Kennedy Space Center in Florida heralds the arrival of a new era in exploration as the countdown continues for the launch of a United Launch Alliance Delta IV Heavy topped by the agency's Orion spacecraft for its first flight test. For more information, visit www.nasa.gov/orion Photo credit: NASA/ Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, news media and other guests gather in anticipation of the launch of NASA's Orion spacecraft atop a United Launch Alliance Delta IV Heavy rocket. For more information, visit www.nasa.gov/orion Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – A spectacular sunrise at NASA's Kennedy Space Center in Florida heralds the arrival of a new era in exploration as the countdown continues for the launch of a United Launch Alliance Delta IV Heavy topped by the agency's Orion spacecraft for its first flight test. For more information, visit www.nasa.gov/orion Photo credit: NASA/ Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Kennedy Space Center’s Press Site auditorium, Dan Collins, United Launch Alliance chief operating officer spoke to members of the news media about the postponement of the Orion Flight Test launch due to an issue related to fill and drain valves on the Delta IV Heavy rocket. For more information, visit www.nasa.gov/orion Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- In the Kennedy Space Center’s Press Site auditorium, news media representatives listen and take photographs as NASA and industry leaders talk about the postponement of the Orion Flight Test launch due to an issue related to fill and drain valves on the Delta IV Heavy rocket. For more information, visit www.nasa.gov/orion Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – This helicopter view of Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida shows the United Launch Alliance Delta IV Heavy rocket as it stands ready to boost NASA's Orion spacecraft on a 4.5-hour mission. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This helicopter view of Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida shows the United Launch Alliance Delta IV Heavy rocket as it stands ready to boost NASA's Orion spacecraft on a 4.5-hour mission. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This helicopter view of Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida shows the United Launch Alliance Delta IV Heavy rocket as it stands ready to boost NASA's Orion spacecraft on a 4.5-hour mission. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This helicopter view of the NASA Causeway connecting NASA's Kennedy Space Center with Cape Canaveral Air Force Staton shows the thousands of vehicles parked where guests gather to see the launch of the Orion Flight Test. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This helicopter view of Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida shows the United Launch Alliance Delta IV Heavy rocket as it stands ready to boost NASA's Orion spacecraft on a 4.5-hour mission. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, the new countdown clock at the spaceport's Press Site is used for the first time as preparations were underway for the Orion Flight Test. News media representatives gather in anticipation of the launch of NASA's Orion spacecraft atop a United Launch Alliance Delta IV Heavy rocket. For more information, visit www.nasa.gov/orion Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – This helicopter view of the Kennedy Space Center Visitor Complex shows the thousands of vehicles parked where guests gather to see the launch of the Orion Flight Test. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – This helicopter view of Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida shows the United Launch Alliance Delta IV Heavy rocket as it stands ready to boost NASA's Orion spacecraft on a 4.5-hour mission. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, the new countdown clock at the spaceport's Press Site is used for the first time as preparations were underway for the Orion Flight Test. The modern, multimedia display is similar to the screens seen at sporting venues. The new screen is nearly 26 feet wide by 7 feet high, a foot taller than the original clock. For more information, visit www.nasa.gov/orion Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – This helicopter view of the Kennedy Space Center Visitor Complex shows the thousands of vehicles parked where guests gather to see the launch of the Orion Flight Test. The liftoff was postponed because of an issue related to fill and drain valves on the Delta IV Heavy rocket that teams could not troubleshoot by the time the launch window expired. For more information, visit www.nasa.gov/orion Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Kennedy Space Center’s Press Site auditorium, agency and industry leaders spoke to members of the news media about the postponement of the Orion Flight Test launch due to an issue related to fill and drain valves on the Delta IV Heavy rocket. From left are: Brandi Dean of NASA Public Affairs, Mark Geyer, NASA's Orion program manager, Mike Hawes, Lockheed Martin Orion Program manager, and Dan Collins, United Launch Alliance chief operating officer. For more information, visit www.nasa.gov/orion Photo credit: NASA/Frankie Martin