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New ring detected around Saturn

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How well do we know the planets in our galaxy? Saturn is the one with the mysterious and rather beautiful rings.

But today astronomers announced that they have found a huge new ring around the planet, eight million miles from Saturn, a ring so large that it could fit one billion planet earth's inside it.

If it's so huge, how could we have missed it for so long?

Our Science Correspondent David Shukman has the details.

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