Moon

The moon is one of Earth's natural satellites.

Overview
1 gram of moon rock is worth about 600,000 yen.

Alien Conquerors Arc
Boros kicks Saitama to the moon. Saitama jumps back to Earth and leaves a crater on the moon.

Monster Association Arc
A shot of the moon with the crater can be seen when Brave Giant is using his Millenium Emperor Nova.

Chapter 37 Bonus
Saitama finds a small piece of rock from the moon in his shoe.