Great story, not so much about the concept. Scott talks in his head to a entity (presumably God) on the far side of the moon, and a lot of self-reflection is done. The "far-side of the moon scene" explores some very mature ideas about humanity, self, and empathy that may be too much for younger children to handle, or just completely go over their heads. If you think your child can handle it, I would buy this book. The far side of the moon scene is extremely thought-inducing and interesting.