and they say the lunar landing was a hoax.

I think you may have confused gravity for atmosphere.Compared to Earth, Luna is a vacuum, but it does have SOME atmosphere. According to NASA, it has about 1,000,000 molecules per cubic centimeter while Terra has 10,000,000,000,000,000,000,000 for the same volume. Until I looked it up, I did not realize that sodium could be a gas, but it's part of the lunar atmosphere.

I hadn't figured out how to do that yet when I made this. I know now, but don't do much animating these days.