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Man’s Place in the Universe by Alfred Russel Wallace, was the first serious attempt by a biologist to evaluate the likelihood of life on other planets. The author's conclusions were that because earth is the only planet where water exists in the liquid phase, it would be the only planet in our solar system that could support life.
This book has 223 pages in the PDF version. This is the third edition, and was originally published in 1904.
Production notes: This ebook of Man’s Place in the Universe was published by Global Grey in 2018.