sentence: Fusion produces a lot of energy.
sentences_before: The energy of stars comes from nuclear fusion. This is a process that turns a light chemical element into another heavier element. Stars are mostly made of hydrogen and helium. They turn the hydrogen into helium by fusion. When a star is near the end of its life, it begins to change the helium into other heavier chemical elements, like carbon and oxygen.
sentences_after: The energy makes the star very hot. The energy produced by stars radiates away from them. The energy leaves as electromagnetic radiation.
concept_name: fusion
headings: Star
categories: Astrophysics