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The sun doesn’t burn like fire because there is no oxygen in space. Instead, the sun’s heat and light come from nuclear reactions inside it. In the future, the sun will become a “red giant” and run out of energy.
Most of us learned in school that there are three components needed for fire: fuel, oxygen and heat. But there is no oxygen or other gases in space because the gravitational pull of the planets keeps the gases inside their atmosphere. How, then, does the sun burn without oxygen? The answer is that the sun doesn’t actually burn, not in the sense we’re used to. The heat and light of the sun are due to the nuclear reactions that take place inside it. It seems to us that the sun is on fire, but it is not. The nuclear reactions within the sun are so powerful that its core temperature reaches 27 million Fahrenheit (15 million degrees Celsius).
Read more about the sun:
The earth is 93 million miles (about 149 million kilometers) from the sun.
Our atmosphere protects us from the sun’s ultraviolet light, which is why scientists are concerned about the potential consequences of ozone depletion.
Scientists believe that in another 4.5 billion years the sun will become a “red giant” and eventually enter a process of running out of energy.
