Every so often I see a free app that is just dying to be used as an iPhone demonstration. The candidate for today is the American Museum of Natural History app called Cosmic Discoveries.
When you open the app, you see an image of Saturn. It's a bit crinkly, so you dive in for a closer look, dragging your fingers apart to trigger a zoom. What you'll find is that the image is composed of many hundreds of pictures that can be expanded to near full screen proportions. The zoom goes almost literally to infinity. Some of the pictures are historical photos of observatories or scientists, while many others are striking images of the planets and deep space objects taken by some of our best observatories, or the Hubble or
