The exploration of space as described by Wyndham ten yeras before the first Moon landing. The Troon family were subject to "the outward urge", and successive generations were involved in space exploration, from the buiding of the first space station to the first landing on Mars.
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Used availability for John Wyndham's The Outward Urge
January 1959 : UK Hardback
January 1962 : UK Paperback