NASA[2] scientists have been puzzled by the peculiarly life-like image which has been beamed back to earth by one of their two robot rovers that are currently trundling about the surface of the red planet, on the hunt for clues of life on Mars[1].

Mars and Venus, those seemingly contrasting planets of self-help book fame, have more in common than you might think.

A spacecraft whizzed past Saturn's moon Enceladus on Wednesday and through a huge geyser spurting from its south pole, collected samples of ice and gas shooting about 500 miles into space.