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On 18 February 1930 Pluto was discovered by a young research student named Clyde Tombaugh. Since that time Pluto has set puzzle after puzzle. It is smaller than expected, it has an unusual path and it has a moon, Charon, which is one third its size. Today, at the age of 77, Clyde Tombaugh is one of America's most respected astronomers.

For this programme, Patrick Moore flew to Arizona to meet Professor Tombaugh and to ask him what he now thought about the curious planet he discovered half a century ago. But first we join Clyde Tombaugh in Las Cruces, New Mexico, exactly 50 years to the day of his discovery, at a banquet to honour the only living man who has discovered a new planet. (1980)