Here's why:
* Fusion Powerhouse: The Sun's energy comes from nuclear fusion in its core, where hydrogen atoms are converted into helium. This process releases tremendous amounts of energy.
* Hydrogen Fuel: The Sun is primarily composed of hydrogen, which acts as its fuel for fusion.
* Fusion Rate: The rate of fusion depends on the Sun's mass and temperature. These factors determine how quickly hydrogen is consumed.
* Lifespan: The Sun is currently about 4.6 billion years old, meaning it has about 5.4 billion years of hydrogen burning left.
After this period, the Sun will start to evolve into a red giant, eventually shedding its outer layers and becoming a white dwarf.
