Methone, a moon of Saturn only about three kilometres across, has no observed craters larger than 130 metres: its porous icy surface may slowly shift and erase impact scars, while Saturn’s tides and the moon’s rotation mould it into a smooth, egg-like shape.

Cassini's only close look at tiny Methone found no crater larger than about 130 metres. Its smooth shape points to an extraordinarily porous moon whose surface cannot preserve relief easily. The post Methone, a moon of Saturn only about three kilometres across, has no observed craters larger than 130 metres: its porous icy surface may slowly shift and erase impact scars, while Saturn’s tides and the moon’s rotation mould it into a smooth, egg-like shape. appeared first on Space Daily .