Daniel: There’s no gravity on the moon.
Me: Actually there is, it’s just less.
Herself: Why is that?
Me: Well objects kind of attract stuff to them and the larger the object the harder it attracts – the moon is much smaller than the earth so gravity is less. At least, I think that’s how it works.
Herself: Are we lighter on the moon?
Me: Um, I think this is about the difference between mass and weight. Let me think, you have the same mass everywhere but your weight is different because of gravity.
Daniel: Is there mass on the moon?
Me: Yes, that’s it, mass is the same everywhere.
Daniel: Do they have churches on the moon?