The competition is heating up to be crowned the base for the world's biggest radio telescope, the Square Kilometre Array, with two rival bids - in southern Africa and Australia's Western Desert - have emerged as front runners.

The headquarters of the telescope, which will dramatically improve our view and understanding of the universe, is to be based in the UK.

Science correspondent Tom Feilden reports on the experiment and the fierce competition for where the giant telescope will be built.

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