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

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