Journeys in Time and Space

Planet Hunting (1x4)

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Chris Riley meets the team who have discovered most of the known planets outside our Solar System, and finds out why recent events have forced astronomers to reconsider what a planet actually is. PhD student Debbie Pearson talks about spotting stars using the world's most powerful group of telescopes - the COAST project in Cambridge. And, investigating claims that global warming may not be entirely a man-made problem, the team examine our nearest star - the Sun.