Final answer:
The main power source for stars similar to our sun is the fusion of hydrogen into helium.
Step-by-step explanation:
The main power source for stars similar to our sun is the fusion of hydrogen into helium. This process, known as nuclear fusion, occurs in the core of the star where the temperature and pressure are extremely high. The fusion reaction releases an enormous amount of energy in the form of light and heat, which sustains the star's luminosity and enables it to shine.
Learn more about Power source of stars similar to our sun