By Thomas Moore, Science And Health Correspondent
A US spaceship designed to take astronauts to an asteroid and then Mars is due to blast off for its debut test flight later today.
The unmanned version of NASA's Orion capsule should lift off from Cape Canaveral in Florida at 12.05pm UK time.
A Delta IV Heavy rocket will power the capsule to a height of 3,600 miles, 15 times higher than the space station, before turning round to re-enter the atmosphere at 20,000mph.
Mark Geyer, program manager of Orion, said: "Really, we're going to test the riskiest parts of the mission.
"Ascent, entry, plus the navigation and guidance - all those things are going to be tested."
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Gallery: New Spacecraft To Debut This Week
NASA prepares to test flight new spacecraft Orion. Pic: NASA/Kim Shiflett
Orion will eventually carry people beyond Earth's orbit
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