What If the Earth Had Two Moons?: And Nine Other Thought-Provoking Speculations on the Solar System
by Neil F.Comins
In What If the Earth Had Two Moons, Neil Comins leads us on a fascinating ten-world journey as we explore what our planet would be like under different astronomical conditions. In each case, the Earth would be different, often in surprising ways. 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 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. This and nine and other speculative essays provide us with insights into the Earth as it exists today, while shedding new light on the burgeoning search for life on planets orbiting other stars.
Alternate history looks at "what if" scenarios focusing on important historical turning points and presents a different version based on science, fact and conjecture. Neil F. Comins has used this formula for Earth's astronomical conditions. Follows on the author's previous, "What If the Moon Didn't Exist?"