*Captured asteroid could provide stepping stone for exploration of Mars
*It would be first time a celestial object has ever been moved by humans
Nasa scientists are planning to capture a 500 ton asteroid , relocate it and turn it into a space station for astronauts on their way to Mars.
The White House's Office of Science and technology will consider the £1.6bn plan in the coming weeks as it prepares to set its space exploration agenda for the next decade.
If approved it would be the first time a celestial object has ever been moved by humans.
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