During their time orbiting the Moon, the Apollo 17 astronauts had a view of the Earth that only a dozen people have shared.

When you look out the window of a jet airliner, you can get an idea about just how big the Earth might be.

It's the opposite at the Moon. You get an idea on just how small the Earth might be.

Then, of course, there's the "magnificent desolation" (Buzz Aldrin Quote) of the Moon.