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What If the Earth Had Two Moons?: And Nine Other Thought-Provoking Speculations on the Solar System
 
 
Author
Neil F. Comins.
Publisher St. Martin's Griffin  
Format paperback
Product Dimensions 8.25 x 5.45 x 0.8 inches
ISBN 9780312673352
Pages/Publication Date 288/2010
Daedalus Item Code 40734
List Price: $15.99
Sale Price: $3.98
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Description
Astrophysicist Neil Comins takes us on a fascinating ten-world journey to explore what our planet would be like under alternative astronomical conditions. In each case, the Earth would be a very different place, often in surprising ways. The title chapter, for example, imagines a second moon, orbiting closer than the one we have now. The night sky is a lot brighter, but that won't last forever; eventually the moons collide, with one extra-massive moon emerging after a period during which Earth sports a Saturn-like ring.

"Stretching his scientific imagination, Comins tweaks the astronomical dials that control evolution on Earth, such as the length of the day, the height of the tides, or plate tectonics. He adds a second moon; he converts Earth into a moon of a Neptune-like planet; he reverses the direction of the Moon's orbit; he puts an additional Earth into Earth's orbit; he moves the solar system to other locations in the Milky Way; and in an ostentatious display of omnipotence, Comins makes Earth 15 billion years in the future.... Comins plays out his scenarios in physics-grounded narratives that all posit the same result despite different evolutionary paths: the rise of humans."Booklist

 
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