Cassini spacecraft flyby of Saturn moon to look for clues of life

Nasa probe will fly within 30 miles of the moon's south pole, sampling water vapour in a bid to learn more about vast frozen underground oceans

The Cassini spacecraft is in for an icy shower as it passes within 30 miles (50km) of one of Saturn's many moons on Wednesday.

Jets of of water vapour and frozen particles erupting from the south pole of the moon, Enceladus, are expected to provide the best sampling yet of its underground ocean.