We are in one galaxy called the Milky Way. When you look at the Milky Way's next-door neighbour, the Andromeda galaxy, your telescope is a time machine taking you back two and a half million years. There's a cluster of five galaxies called Stephan's Quintet, which we see through the Hubble telescope spectacularly colliding with each other. But we see them colliding 280 million years ago. If there are aliens in one of those colliding galaxies with a telescope powerful enough to see us, what they are seeing on Earth, at this very moment, here and now, is the early ancestors of the dinosaurs. Are