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A tour of Venus with David Grinspoon of the University of Boulder, Colorado. Measuring distances between stars from space - discussion with Michael Perryman, the project scientist for the Hipparcos mission. Plus what was happening among the stars and planets in June 1999. Presenters: Heather Couper and Nigel Henbest. Picture: Crescent moon and Venus, Credit: Getty Images This is a programme from the ÃÛÑ¿´«Ã½ World Service Archive and was originally broadcast in 1999.
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