It is an interesting mix of facts and fiction that truly engages the reader. In fact, I almost found myself wishing that the Apollo 18 flight had actually taken place. Before reading this, I had the misconception that the moon had a dark side. However, I was corrected to learn that it simply has "the other side," which is not necessarily dark. The book also managed to bring to the forefront my deep-seated despise for any form of fanatism, especially religious fanatism.
Finally, when considering the vastness of the universe, it is truly mind-boggling. When someone mentions parallel universes, I often wonder "what for?" Given that our own universe is seemingly infinite, why should we worry about others? Just think about traveling to Proxima Centauri, our closest neighbor star. It would take 4 light years to reach there. And one light year is an astonishing 9.4 x 10^14 km or 9.4 followed by 14 "0". That's about 37,000 Jovian years! It seems almost too much of a bother to even consider traveling such vast distances.