Mining asteroids for gold and platinum
Details have been emerging of a plan by billionaire entrepreneurs to mine asteroids for their resources.
The multi-million-dollar plan would use robotic spacecraft to squeeze 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 aim to create a fuel depot in space by 2020.
Pallab Ghosh reports.