NASA just released an image from Mars Odyssey which makes a good analogy of the Tunguska event on Mars (shock wave damage but no big crater): http://themis.asu.edu/zoom-20080813a A reminder that SLAS will be holding it's regular monthly general meeting tomorrow (Tuesday) evening. U of U Physics' Dr. Dave Keida will present an update on the U's two new observatories. http://slas.us/displayevent.asp?EventID=1193 And, totally off topic but if you're looking for a few grins: Why I didn't make the olympics! http://www.youtube.com/watch?v=pfwM1DWGmsc Cheers, patrick