Scientists about for from in of on the the USA have seen something amazing about for from in of on the space about for from in of on the the very first time. They saw gravitational waves. These are waves that form about for from in of on the space and travel outwards. The waves are similar to how ripples about for from in of on the water move outwards after you throw a stone about for from in of on the a lake. The gravitational waves about for from in of on the space start when two giant space objects hit each other. Albert Einstein first spoke about waves about for from in of on the space about for from in of on the 1916 when he made his General Theory about for from in of on the Relativity. One hundred years later, the researchers have proved that Einstein's theory was right. The researchers used powerful technology to see the gravitational waves. Einstein did not have this technology. He used his genius to predict that the waves existed. Scientists say the discovery about for from in of on the the gravitational waves is one about for from in of on the the most important discoveries ever. Dr Lawrence Krauss, about for from in of on the Arizona State University, said the discovery was as great as the invention about for from in of on the the telescope. He said it would let scientists see many new things about for from in of on the space. It would also answer many questions about for from in of on the our universe. Dr Krauss said: "It has opened a new window about for from in of on the the universe, just like the 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 about for from in of on the the universe we’ve never seen before." He said it was beautiful that about for from in of on the discovery happened 100 years after Einstein's prediction.