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RN Big Ideas -

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More than 700 new planets were discovered in the past two decades. About half of sun-like stars are believed to harbour at least one. But you have to know how to look for them. Professor Chris Tinney explains different detection techniques. We learn how planets are formed and that the extra-solar planets which astronomers have found so far have a bewildering array of properties - and the vast majority looks nothing at all like our Solar System.