How the Sun Works

Our Sun has been burning brightly for currently about 4.5 billion years and will continue to do so for another 7 billion years or so. A photon from the surface of the Sun takes about 8 minutes and 20 seconds for it to reach the Earth; 500 seconds to travel about 150 million km. Inside the Sun, however, it takes many thousands of years for a photon to get from the core to the surface. As the Sun is only about 700,000 km in diameter it should only take a photon traveling at the speed of light about 2.3 seconds to travel that distance. So, why does it take so long? Studying the inner anatomy of the Sun, itʼs density, and processes is the only way to come to understand why it takes as long as it does for a particle traveling at light speed to move such a short distance.

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