The Worst Blunders People Make in Inventing Fictional Alien Worlds

We love stories that take us to alien planets and let us explore whole new environments. But not every alien planet is totally realistic, especially given how much we've learned about exoplanets lately. So we asked six experts to tell us the biggest mistakes they see in fictional habitable worlds — and here's what they … » 2/20/14 8:32pm 2/20/14 8:32pm