The sun is made up of plasma and has magnetic north and south poles like Earth. It accounts for over 99% of the solar system's mass and its gravity dominates the orbits of planets. Science believes the sun will eventually become a red giant as it runs out of hydrogen for nuclear fusion, growing hotter over 100,000K before shrinking into a white dwarf with no heat or light. Recently NASA observed an abnormally large coronal hole near the sun's south pole, indicating the sun may be entering a phase of increased solar activity before transitioning to a red giant.