NASA is teaming up with the European Space Agency to get astronauts beyond Earth's orbit.
Europe will provide the propulsion and power compartment for NASA's new Orion crew capsule, officials said Wednesday.
This so-called service module will be based on Europe's supply ship used for the International Space Station.
Orion's first trip is an unmanned mission in 2017. Any extra European parts will be incorporated in the first manned mission of Orion in 2021.
NASA's human exploration chief, Bill Gerstenmaier, said both missions would be aimed at the vicinity of the moon. The exact details are being worked out; lunar fly-bys, rather than landings, are planned.
NASA wants to ultimately use the bell-shaped Orion spacecraft to carry astronauts to asteroids and Mars. International co-operation will be crucial for such endeavours, Gerstenmaier told reporters.
No clear path for NASA
The United States has yet to establish a clear path forward for astronauts, 1 1/2 years after NASA's space shuttles stopped flying.
The basic requirements for Orion spacecraft are well understood regardless of the destination, allowing work to proceed, Gerstenmaier said.
"You don't design a car to just go to the grocery store," he told reporters.
Getting to 2017 will be challenging, officials for both space programs acknowledged. Gerstenmaier said he's not "100 per cent comfortable" putting Europe in such a crucial role. "But I'm never 100 per cent comfortable" with spaceflight, he noted. "We'll see how it goes, but we've done it smartly."
The space station helped build the foundation for this new effort, he said.
$600M investment
Former astronaut Thomas Reiter, Europe's director of human spaceflight, said it makes sense for the initial Orion crew to include Europeans. For now, though, the focus is on the technical aspects, he said. NASA will supply no-longer-used space shuttle engines for use on the service modules.
Reiter put the total European contribution at nearly $600 million US.
Orion originally was part of NASA's Constellation program that envisioned moon bases in the post-shuttle era. U.S. President Barack Obama cancelled Constellation, but Orion was repurposed and survived.
A test flight of the capsule is planned for next year; it will fly 5,790 kilometres away and then return.
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