"What if" questions have always stimulated people to think in new ways. "What if the Earth Had Two Moons" leads us on a fascinating 10 world journey exploring what the Earth would be like if conditions in the universe were slightly different. The answer: Earth would be different,often in ways that would surprise us. The title chapter,for example,gives us a second moon orbiting closer to Earth than the one we have now. The night sky is a lot brighter,but not forever. Eventually the moons collide,with one more - massive moon emerging after a period during which Earth has a Saturn-like ring. The scenarios also shed new light on the burgeoning search for life on planets orbiting other stars.
Publisher: Griffin PublishingISBN: 9780312673352Number of pages: 304Dimensions: 140 x 210 mm
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