I first discovered this site from Sarah McFadden’s Google+ post.  The Scale of the Universe 2 site is a FREE, interactive site that allows students to get a spacial sense of just how big and small things around us are.  Click on the image below to experience this very engaging site.  I have also include the Powers of Ten video from 1977 that starts to zoom ten times farther out until our own galaxy is visible only as a speck of light among many others and then returning to Earth that ends inside a proton of a carbon atom within a DNA molecule in a white blood cell.