"A Hole in the Sky" is an exciting science fiction book written by the talented writer Robert Heinlein. In this book, readers go on an exciting journey through the galaxy, where they meet unexpected inventions and incredible adventures. The main character, a scientist who makes an important discovery in space, finds himself in a situation where he has to make a choice between his own principles and the general well-being. Readers, after turning the last page of this book, are left with the satisfaction of the emotions experienced and the thoughts about what important issues are difficult to solve in the future.