Have you ever visited an observatory and looked through the big telescope?
It’s pretty amazing what is out there in space: millions of stars you could never see with the naked eye.
Don’t ask if you can look through the other end of the telescope so that everything will look really really far away.
The staff don’t like that very much.
note: I want a periscope for my van, so I can see what’s in front of the big truck I’m usually following.