Light travels extremely fast. In science, the speed of light is one of the most important numbers to know. The speed of light in space is about 300,000 kilometers per second. This means light can travel around the Earth more than seven times in just one second!

This speed is a key idea in physics, especially in the study of space, time, and energy. Scientists use it when they study stars, galaxies, and even when they send messages to spacecraft. It is also used in Einsteins famous formula, E = mc², where the speed of light helps explain how energy and mass are related.

Light can travel through space without needing air or any material. That’s why we can see the light from the sun and stars, even though they are very far away. The speed of light is also important in everyday life — it helps us understand how fast we get signals in fiber optics, internet cables, and even remote controls.

So, if you are asked about the speed of light, remember this magic number: 300,000 km per second. It’s a simple fact, but it helps explain big things in the universe.