UK space scientists and engineers have designed a mission to investigate a potentially hazardous asteroid.
The 300m-wide (984ft) rock, known as Apophis, will fly past Earth in April 2029 at a distance that is closer than many communications satellites.
Astrium, based in Stevenage, Herts, wants a probe to track the asteroid so its orbit can be better understood.
The concept will compete for a $50,000 (£25,000) Planetary Society prize, but a full mission would cost millions.
The British design calls for a small, remote-sensing spacecraft, dubbed Apex, which could rendezvous with Apophis in January 2014.