Stars produce light because they release energy. Complete the sentence. Choose the answer from the box.
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The process which releases energy inside stars is __________.

Stars generate energy through a process called nuclear fusion. In the core of a star, immense pressure and temperature cause lighter atomic nuclei (like hydrogen) to fuse together to form heavier nuclei (like helium). This process releases a vast amount of energy in the form of light and heat. Combustion is a chemical reaction (burning), and conduction is a method of heat transfer, neither of which powers a star.