I miss my friends. Where are they?
At their houses, in their beds.
Why in bed?
Because it’s bedtime. Time for sleepin’.
Because the sun went down and now it’s night.
Why the sun go down?
Because the earth rotated and so it looks to us like the sun went down past our horizon as we turned away. It happens every day.
An then the sun come up. Why?
Because the earth rotates on its axis and around the sun.
You’re going to have to study physics to learn more.
But I can’t go school, I miss my friends.
Well if you go to sleep you can go to school with your friends and study physics.