The Best Astronomy Pictures

If you don't already know about it, you should take a look at Astronomy Picture of the Day, which you can find by google-searching APOD. As you can see, it's quite beautiful. I love to save some of the pictures and use them as my desktop background. One of my favorite type of images are those that use prolonged exposure, like the one from Friday: http://apod.nasa.gov/apod/ap090501.html