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Details have been emerging of the plan by billionaire entrepreneurs to mine asteroids for their resources.
The multi-million-dollar plan would use robotic spacecraft to squeeze chemical components of fuel and minerals such as platinum and gold out of the rocks.
The founders include film director and explorer James Cameron as well as Google's chief executive Larry Page and its executive chairman Eric Schmidt.
They even aim to create a fuel depot in space by 2020.
However, several scientists have responded with scepticism, calling the plan daring, difficult and highly expensive.