The Sun is located 150 million kilometers away from us. If a baby were to travel to the Sun on a high-speed train at 200 kilometers per hour, they would spend their entire life on the journey, only to reach old age without ever arriving. The Sun is not only our source of light but also the lifeblood of life on Earth. It bestows us with brightness and warmth every day, filling our planet with vitality. As the closest star to us in the Milky Way, even a supersonic airplane would take 12 years to reach it.
The Sun's heat is astonishing, with a surface temperature of 5,500 degrees Celsius and a core temperature soaring to 15 million degrees Celsius. Scientists estimate that the Sun has a lifespan of about 10 billion years, and we are currently halfway through its life, in its middle age. How can such a scorching celestial body continue to burn for 5 billion years? What natural mysteries lie behind this phenomenon?
