Taking all these elements together, he concludes that Mars and Venus are the only places in the Solar System other than Earth that could harbour life. He eliminates the outer planets (too cold); Mercury (too hot on the sunny side and too cold on the other); and the Moon and asteroids (their gravities are too weak to trap atmospheres).
Churchill began his essay not long after the 1938 US broadcast of the radio drama The War of The Worlds (an adaptation of H. G. Wells's 1898 story) had generated 'Mars fever' in the media.
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