A competition in the US has been launched to get budding innovators to build a robot that can fly to the moon.
The X Prize Foundation, based in California, is calling for teams to design the spacecrafts - with a promise of $20 million (£10m) to the winner that reaches the moon first.
Peter Diamandis, of the X Prize Foundation, said: "We are challenging private teams from around the world to design and build robotic explorers and race them to the surface of the moon."
To win, a team will need to send a robot to the moon, make it roam for a minimum of 500 metres and send video, images and data back to Earth, before December 2012.
The original X Prize challenge called for teams to send a rocket-powered plane - with a human on board - high above Earth and bring it safely back.
That challenge was met in October 2004 when a team backed by aerospace engineer Burt Rutan took Space Ship One to the edge of space.
