• 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.
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