14 Jan 2012

Return of Mars probe awaited

8:28 am on 14 January 2012

Russia's failed Mars probe, Phobos-Grunt, is expected to fall back to Earth this weekend.

The satellite was launched into space last November on a mission to bring back soil samples from the Red Planet's largest moon.

But it was stranded around Earth's orbit and is now about to re-enter the atmosphere.

The BBC's science correspondent says most of the 13-tonne satellite will burn up on re-entry, but some debris could reach the surface of the Earth.

The location is uncertain. It could be either the Atlantic Ocean or the Pacific Ocean.