Summary:
- The Sun has no solid material.
- Most atoms in the Sun exist as plasma.
- Because the Sun is made of gases, it does not have a defined outer boundary.
- Like Earth, the Sun has an internal structure.
- The inner three layers make up what we would actually call “the Sun.” The layers are: the core, the radiative zone, and the convection zone.
- Energy from the Sun's core powers most of the solar system.
- It may take 50 million years for a photon to travel all the way through the radiatives zone.