The idea of a black hole - an object so massive that nothing could escape the grasp of its gravity - dates back to the 1700s. But the modern story of black holes really starts with Einstein's revolutionary theory of gravity. Over the past century, scientists have used Einstein's theory of gravity to develop a picture of what black holes must be like. See real images of actual black holes using the Resources “Inside Einstein’s Universe” or explore more about black holes with the UniverseForum here.
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