Conversation

'Stone Architecture on Mars, Demonstrating Mars' two-thirds less gravity than Earth's' (1956) by Chesley Bonestell [Published in: Ley & Von Braun's 'The Exploration of Mars', 1956, p. 66, as plate x]
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'The Conquest of Space' (1949), a speculative science book written by Willy Ley and illustrated by Chesley Bonestell: the surface of Mars, a valley on Mercury, and the Beta Lyrae binary in the sky of an airless planet
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