Real frost - water - on Mars. August 14 2008. It melts about 6 in the morning once the sun comes up. This photo was taken by the Phoenix Mars lander.
What tickled my fancy was that scientists have poured over this image so hard, they have actually given the rocks names! Isn't that cute? The one in the foreground is 'Quadlings' and the one near the centre is 'Winkies'.
Don't ask me, how would I know? The mind boggles.