Beyond relativity

A century after Einstein produced his great theory, it might let us see gravity's waves

By Philip Ball   February 2015

Gravitational waves: predicted by Einstein's theory but yet to be detected

One hundred years ago, Albert Einstein presented a paper to the Prussian Academy of Sciences that explained gravity. It is one of the four funda- mental forces in the universe, although in 1915 only one of the others—the electromagnetic force—was known. (The other two act inside the atomic nucleus.) But Einstein’s paper offered a radically different way of thinking about gravity. Rather than being an invisible force between…

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