I've just held an astronomy lesson for a class of a friend.
It was greatly appreciated both by pupils and teachers.
I'm telling that here because I've used only images produced by Celestia.
I started from far ouside the galaxy stepping closer and closer down into the solar system. When I annouced "Here we are eneterig in the solar system: look at the Pluto's slice with its moon!"
At this point something has been switched on in the brain of a pupil and He sayd: "How do you catch that a photo? ".
Celestia is really great!
Thanks to all the developers.