The fusion reaction inside the sun has been increasing
The fusion reaction inside the sun has been increasing, on average, every 1 billion years, it will release about 10% more energy, according to this calculation, in 1 billion years, the temperature of the earth's surface will rise to more than 50 degrees Celsius, then the earth will no longer be suitable for human survival, and in 5 billion years, the sun will also be because the core "fuel "The exhaustion of the core "fuel and expand into a red giant ......