The European Southern Observatory has just posted their Top 100 Images online. Science teachers should definitely check it out!

Each of the images is displayed as a taster thumbnail, and each links to a page with more information and larger versions of the image.

Flame Nebula

If you are looking for “wow” images to use in lessons, or just want some different desktop backgrounds, then go take a look: http://www.eso.org/public/images/archive/top100/