Oceans of the Solar System

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Water defines the Earth, and is crucial to life. Once we thought oceans were unique to our planet, but astronomers are now discovering them all over the solar system, raising the possibility of life in places we never thought possible. This BBC Horizon program sets sail on an epic journey; from the icy wastes of Enceladus to the prehistoric oceans of Mars, and to the methane lakes of Saturn's biggest moon Titan-where NASA plans to send a submarine to dive into the murky depths. Are we on the verge of discovering that-far from being unique-life in the solar system is ubiquitous?