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Duration: 29 minutes

Blue Peter presenters Helen Skelton and Barney Harwood want to learn more about the solar system so they challenge scientists Helen Czerski and Jem Stansfield to find out more. They look at how to make telescopes and rockets, and use a toilet roll to measure the distances between planets.

Last on

Wed 8 Jan 2014 05:30 BBC Two

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Helen Skelton
Barney Harwood
Helen Czerski
Jem Stansfield


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