Follow a thread
Curiosity doesn't end. It turns.
Start where your child already is. The thread finds the next night, then the one after that, and names the idea that carried you between them. Nothing here is a recommendation engine guessing at you. Every step is a real connection in the science.
Start here
Another way in
Or see the whole shape.
A thread is one way through. The ideas themselves show you everything at once: gravity, light, rest, and the nights where each of them turns up.