What would happen if the sun was gone?

2026-01-10 13:21

If the sun disappeared, Earth would face a series of catastrophic changes: 1. * * Illumination ** - After about 8 minutes (about 8 minutes and 20 seconds), the Earth would fall into eternal darkness, because it took so long for the solar photons to travel to Earth. As the sun disappeared, the moon in the sky would also disappear after 2 minutes due to the lack of sunlight reflection. 2. * * Magnetic Field and Weather ** - After the sun disappeared, the Earth's magnetic field would change significantly, and there might be auroras. Without the sun's heat supply, the earth would gradually become cold. About a week after the sun disappeared, the heat began to disappear, and the average temperature would drop to around 0 degrees. A month later, the temperature would drop to-30 degrees, and the lakes and rivers on the land would start to freeze, and the surface would be completely covered in snow. A year later, the Earth's temperature would drop to-70 degrees, and two years later, it would drop to-200 degrees. The ocean would be completely frozen, and the Earth would eventually become a cold ice ball. 3. * * In terms of ecology ** - The sun disappeared for an hour, and the surface temperature dropped rapidly. Network communications began to gradually break down. A week later, the photosynthesis of plants completely stopped and no longer produced oxygen. 90% of the plants on Earth disappeared due to the cold and lack of light. A month later, the animals on Earth gradually died out, and the surviving humans and animals had to live close to volcanoes to obtain heat. 4. * * Earth Orbit ** - The moment the sun disappeared, the Earth would not immediately change, but after 8 minutes and 20 seconds, as the sun's gravity disappeared (the speed of gravity was the same as the speed of light), the Earth would leave its original orbit at a speed of 30 kilometers per second and fly out of the solar system, becoming a wandering planet in space. 5. * * In terms of human survival ** - Human civilization was facing a huge challenge. A month after the disappearance of the sun, Earth would no longer be suitable for life, and the entire food chain would collapse. In order to survive, only a small number of technological elites could enter the underground city to live. They could continue to survive through artificial sunlight and stored food and energy. They also worked hard to establish a stable ecosystem so that they could have a long-term source of food. However, this also faced many difficulties, such as the depletion of energy. In the end, all traces of human civilization might be buried under the endless ice sheet.