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Scientists in the USA have something amazing in space for the very first time. They saw gravitational waves. These waves that in space and travel outwards. The waves are similar to how ripples in water outwards after you a stone in a lake. The gravitational waves in space when two giant space objects hit each other. Albert Einstein first about waves in space in 1916 when he made his General Theory of Relativity. One hundred years later, the researchers have that Einstein's theory was right. The researchers used powerful technology to the gravitational waves. Einstein did not have this technology. He used his genius to predict that the waves .

Scientists say the discovery of the gravitational waves one of the most important discoveries ever. Dr Lawrence Krauss, from Arizona State University, said the discovery as great as the invention of the telescope. He said it would scientists many new things in space. It would also many questions about our universe. Dr Krauss said: "It has a new window on the universe, just like the telescope." He added that: "Using gravitational waves to the universe will us to see things we could have never seen before….It will also allow us to explore objects in the universe we’ve never before." He said it was beautiful that the discovery 100 years after Einstein's prediction.