CAPE CANAVERAL (REUTERS) - A US spaceship designed to one day fly astronauts to Mars made a near-bullseye splashdown in the Pacific Ocean on Friday, wrapping up a flawless, unmanned debut test flight around Earth.
"It's hard to have a better day than today," Nasa's Orion capsule program manager Mark Geyer told reporters after landing.
The cone-shaped capsule blasted off aboard a Delta 4 Heavy rocket, the biggest in the US fleet, just after dawn from Cape Canaveral Air Force Station in Florida.
Three hours later, it reached peak altitude of 5,800km above the planet, a prelude to the most challenging part of the flight, a 32,000kmh dive back to Earth.
Orion survived a searing plunge through the atmosphere, heating up to 2,200 deg C - twice as hot as molten lava - and experiencing gravitational forces eight times stronger than Earth's.
Over the next few minutes, a total of 11 parachutes deployed to slow Orion's descent, including three gigantic main chutes that guided the spaceship to a 32kmh splashdown 1,014km south-west of San Diego, California, at 11.29am EST.
Details of the spaceship's performance, especially how it weathered surges of radiation as it passed through the lower Van Allen radiation belt, will come after data recorded by more than 1,200 onboard sensors is retrieved and analysed.
"I'm sure we're going to find some very interesting things,"Geyer said.
The point of the flight, which cost Nasa about US$375 million (S$495 million), was to verify that Orion's 5m diameter heat shield, parachutes, avionics and other equipment would work as designed prior to astronauts flying aboard.
Nasa has been developing Orion, along with a new heavy-lift rocket, for more than eight years. The design of the rocket has changed, leaving Orion sole survivor of the cancelled Constellation lunar exploration programme to become the centrepiece of a new human space initiative intended to fly crews to Mars.
Nasa has spent more than US$9 billion developing Orion, which will make a second test flight, also without crew, in about four years.
A third mission, expected around 2021, will include two astronauts on a flight that will send the capsule high around the moon.
Since the end of the Apollo moon programme in 1972, astronauts have flown only a few hundred miles above Earth.
"We've... finally done something for the first time for our generation. It's a good day," said Mike Hawes, Orion program manager with Nasa prime contractor Lockheed Martin.
Orion's debut flight originally had been slated for Thursday but a problem with the rocket, built and flown by United Launch Alliance, a partnership of Lockheed and Boeing, delayed the launch one day.
