When scientists used the spacecraft's antennae to analyse radar echoes from the lunar surface, they found that within certain deep canyons near the south pole the echoes increased and were altered in just the way they would be if dirty icerather than rock were filling the caverns.

ECONOMIST: Divining water

Scientists may not be able to explain the "boiler" at the south pole but they are already talking up the possibility that conditions there could allow for liquid water below the surface - with all the implications that might have.

BBC: NEWS | Science/Nature | Saturn moon delights and baffles

The surface of this snow-white moon is riven with cracks - dubbed tiger stripes - at its south pole.

BBC: Enceladus has 'spreading surface'