Saturn's Enceladus moon with 'tiger stripes' containing water
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Saturn's Enceladus moon hides 'great lake' of water

The evidence for an ocean of water under the surface of one of Saturn's moons is overwhelming, according to scientists at NASA and the European Space Agency.

They say it underlines the possibility of finding microbial life elsewhere in our solar system.

The next step is to send spacecraft to investigate further, as BBC science correspondent Pallab Ghosh reports.