We can use our time on the moon to develop and test new approaches and technologies and systems that will allow us to function in other, more challenging, environments.

CNN: Bush: 'It is time for America to take the next steps' in space

But Mr Aldrin disagreed with the view that astronauts should test capabilities for a long-duration flight on the Moon before attempting a journey to Mars.

BBC: Moon astronauts urge Mars mission

We may discover resources on the moon or Mars that will boggle the imagination, that will test our limits to dream.

CNN: Bush: 'It is time for America to take the next steps' in space

The lander Moon Express showed off Thursday is powered by compressed oxygen, for now, as Moon Express employees test it at a NASA facility in Mountain View, California.

FORBES: Naveen Jain: 'Think Of The Moon As Just Another Continent'