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

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