“I'm looking at the moon now and I'm amazed.
“Amazed by what, Golan*?
- Her size. We're used to ignoring satellites, Janav. They are so small, even if they exist at all. This one, however, is something else. This is the whole world. Its diameter is about 3.5 thousand kilometers**.
- World? You probably shouldn't call her that. It may not be habitable. Even this diameter is too small. She has no atmosphere. I can confirm this just by looking at her. There are no clouds. The edge of the disc is sharp, as is the terminator line.
"You're becoming an accomplished spacewalker, Janav," Trevize nodded. - You are right. There is no air. No water. But that only means that the Moon is uninhabited on the outside. But what about dungeons? - Dungeons? asked Pelorat doubtfully.
- Yes. Dungeons. Why not? (...) Imagine that the Moon is a giant spaceship.
— With the crew inside? - Yes. (...) Think about it, Janav, doesn't that make sense?
From Isaac Asimov's "Foundation and Earth"
Space.com
MOON NEIL ARMSTRONG
values and in return accept their inheritance. We consider ourselves knights of the holy Contact. This is the second lie. We are not looking for anyone but people.
We do not need other worlds. We need a mirror.
Stanislav Lem. Solaris