This site is a “picture of the day” site, specifically for earth science.
I would use this picture primarily as a lead into a lesson. I could ask students to describe what the picture was, or ask them what they thought it could be. This would be an interesting way to see where their minds go when they see something foreign. From that, I could either teach on something they said it might be, or tell them what it was and teach about that as well. I could also give them computer access and see if they could research and find out what it was.