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News about the brightness of Venus, Comet Hyakutake, cosmic mirages at the edge of the universe and the moon's disappearing act. Astronomer Ian Nicholson explains what causes the moon to 'disappear' during an eclipse of the moon. Malcolm Longair at Cambridge University explains the gravitational lens effect, when the stars look as if they are changing in brightness. Plus what was happening among the stars and planets in April 1996. This is a programme from the ÃÛÑ¿´«Ã½ World Service Archive and was originally broadcast in 1996.