Scientists saw something amazing for the first time. They saw waves in space. They are called gravitational waves. They start when things in space hit each other. Einstein first spoke about them in 1916. One hundred years later, scientists saw the waves with powerful technology. Einstein used his genius.

Finding gravitational waves is very important. Scientists can now see many new things in space. A scientist said: "It has opened a new window on the universe." He said we can look at things we have never seen before. It is great that scientists found the waves 100 years after Einstein talked about them.