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What If the Earth Had Two Moons?: And Nine Other Thought-Provoking Speculations on the Solar System Hardcover – Bargain Price, March 30, 2010
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Specifically, the questions asked and answered are:
What if the Earth had two Moons?
What if the Earth were the moon of a massive planet?
What if the Earth orbited a less massive sun?
What if the Earth had a thicker crust?
What if the Moon orbited the Earth in the opposite direction?
What if the Earth had two Suns?
What if the Earth had a twin orbiting on the opposite side of the Sun?
What if the Andromeda Galaxy collides with the Milky Way? (Apparently this one is really going to happen at some distant point in the future.)
What if the Earth formed closer to the center of our galaxy?
What if the Earth formed in the distant future?
What if the Earth had Two Moons is certainly entertaining and quite educational.
If you're curious about any of these questions or just have a love of our physical environment then you'll want to read What if the Earth Had Two Moons.
I highly recommend.
Peace to all.
Just as an example from the first few chapters, we take our tides for granted. Most of us know tides are related to the Moon, but we might not think the effects are significant enough to understand the topic in any detail. This book shows that nothing could be further from the truth. The effects are significant, and could have been very different for the different moons considered in this book. Only by considering a variety of possible moons (and different home planets) can we really appreciate our tides and what they could have been. You'll understand how our own tides have slowed down Earth's rotation and flung the Moon into a farther orbit. You'll understand how different conditions could have lead to stopping the Earth's rotation and a moon that gets torn apart by Earth and rains down debris to the planet's surface. That could have been us!
But, this book sheds light on a lot more than tides. By considering different possible earths and moons, we can also appreciate volcanoes - the ones we have, and the ones we're lucky we don't. Tremendous insight is gained by this approach, and leaves the reader in awe at - you guessed it - the world we live in, and what it might have been. Many core pieces of our past and present are woven together and elucidated in this book: the oxygen we breathe, the water life depends on, the plate tectonics that drive geology, and the evolution of life itself. And what if our Sun had different properties, or we orbited two suns instead of one (and many stars are in such pairs)?Read more ›
Each chapter is preceded by a short, entertaining, pseudo-scifi type story describing events unfolding on an alternate "Earth" under each "what if" scenario, followed by a detailed scientific analysis of what would really happen. Particular attention is paid to whether each scenario would allow for sentient life to evolve on the alternate "Earth," highlighting how life on our Earth may not have evolved the way it has had certain conditions been even slightly different.
The book may not be an "easy read," as some reviewers have stated, especially if you are unfamiliar with various science concepts such as plate-tectonics, globular clusters, planetary nebulae, solar winds, etc.(A glossary of terms would have helped, but then, you can look up all these terms on the web.) However, you learn so much from reading this book that it is well worth the effort.
This book would be a great side reader for any astronomy or physics course. In fact, there is so much information in it that it can potentially be used as the textbook proper.Read more ›
Most Recent Customer Reviews
as entertaining as it is informative. I am using this info in my novelPublished 14 months ago by Aaron Joseph McCausland
This book is great. If your a lover of science, astronomy, or just space. This is a great thought-provoking book. Read morePublished 16 months ago by Jaime
This is the sequel to "What if the Earth had no Moon." The author uses powerful computer modeling programs to hypothesize how earth might be if there were different... Read morePublished on March 29, 2014 by Carol Watkins
I downloaded this book looking for the information of the second chapter about how Earth would be if it were the moon of a larger planet. Read morePublished on February 2, 2014 by Arturo
A good introduction to various other possible planetary configurations in about the same orbit as Earth and with an Earth-like sun, and how they would seem to the people who lived... Read morePublished on April 25, 2013 by Mopfog
If you love reading books about what ifs of science, or just like reading in general, this book is for you.Published on February 9, 2013 by Michael Schwartz
This is a collection of ten what-if scenarios for alternate earths in various solar systems. It includes the title scenario of Earth having two moons, how we would have gotten... Read morePublished on October 26, 2012 by D. Thompson