Let's imagine something that will not happen. What if the Sun went out? It is a pretend question. The Sun will not suddenly disappear. Scientists have no reason to expect it. So here is what the Sun really does.
As of November 2026, the Sun has been shining for billions of years. It will keep shining for about 5 billion more years. The Sun is a star. It is the star at the center of our solar system.
What makes the Sun shine? You may have heard that it burns like a giant campfire. In fact, inside the Sun, hydrogen is squeezed together into helium. This is nuclear fusion. It makes the Sun's heat and light.
The Sun is much bigger than any planet. It would take almost 1,000 Jupiters to fill it up. It is also far away, about 93 million miles (150 million kilometers) from Earth, as of November 2026.
Light from the Sun takes about 8 minutes to reach Earth. So we always see the Sun as it was about 8 minutes ago. The Sun gives Earth its light and its warmth.
Plants use the energy in sunlight to make their food. This is called photosynthesis. The Moon does not make its own light. It shines because sunlight lights up and reflects off its surface.
The Sun's gravity pulls on Earth and the other planets. It keeps them circling around it. Earth is the third planet from the Sun. It is the only planet in our solar system with liquid water on its surface.
Sunlight reaches only the top of the ocean. Below about 1,000 meters the ocean is completely dark. You may have heard that all life needs sunlight. In fact, deep in the dark ocean, hot springs called hydrothermal vents have living things that do not depend on sunlight.
Words to know
- hydrogen: a light gas
- helium: a light gas
- fusion: joining together
- hydrothermal: hot water
- vents: hot spring holes
The short version
The Sun is a star that has been shining for billions of years. As of November 2026, scientists say it will keep shining for about 5 billion more years. It will not suddenly go out, so the question is only a pretend one. Its light takes about 8 minutes to reach Earth.
Quick facts
- The Sun is a star, a giant, glowing ball of hot gas.
- Sunlight takes about 8 minutes to reach Earth.
- Inside the Sun, hydrogen is squeezed into helium by nuclear fusion.
- The Sun gives Earth its light and its warmth.
- Plants use sunlight to make food by photosynthesis.
Could the Sun suddenly go out?
Scientists have no reason to expect the Sun to suddenly disappear, so the question is only a pretend one. As of November 2026, the Sun has been shining for billions of years and will keep shining for about 5 billion more years.
Does all life on Earth need sunlight?
Plants use the energy in sunlight to make their food. But sunlight reaches only the top of the ocean, and deep in the dark ocean, hot springs called hydrothermal vents have living things that do not depend on sunlight.
