What is matter made out of?
What is energy?
Why does the Sun shine?

It is made of atoms.

Atoms are made of electrons moving around a nucleus.

Energy is conserved.

With this knowledge about matter, we can discuss why it is a sunny day today.

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA soper@bovine.uoregon.edu