Another attempt to help us imagine the sheer unimaginably astounding size of the cosmos, from Chris Impey, University Distinguished Professor and Deputy Head of the Department of Astronomy at the University of Arizona, in his book How It Began: A Time-Traveler’s Guide to the Universe (New York and London: W. W. Norton and Company, 2012), 98: We live in a city of light. To grasp the vastness, we need a scale model. We can get there in two steps. In the first step,... Read more