Amongst other sources, The Times has reproduced a blow-up from a NASA photograph taken in 2004 on Mars.

The photograph shows what NASA are calling a rock and a "trick of the light" and what conspiracy-lovers and the generally over excitable are calling definitive proof of life on Mars.

( Photographic evidence behind the cut (work friendly) )Of course, there's no need for debate. We have proof positive of life on Mars. Just ask Marvin: