Today's Astronomy Photo of the Day reminded me of something I've been wondering for a while. Is it possible to capture a very dim (to the naked eye) object in the night sky such as the Andromeda Galaxy? It's certainly large enough to fill a frame even without the use of a telescope. Is the Earth's rotation too fast to get a sharp image? Would a high ISO, say 1600, help without destroying clarity? What about photographing our own galaxy?