Is Mars Habitable? (EN) - Alfred Russel Wallace (mp3 audiokniha) - diskusia

"Few persons except astronomers fully realise that of all the planets of the Solar system the only one whose solid surface has been seen with certainty is Mars. " In 1907, Alfred Russel Wallace wrote the short book "Is Mars Habitable?" in response to Professor Percival Lowell's book "Mars and its Canals.
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