A century after Albert Einstein sketched out his radical picture of gravity, astronomers have now watched a black hole physically twist the fabric of spacetime around it. By tracking the death spiral ...

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High-precision space-based gyroscopes are important in space science research and space engineering applications. In fundamental physics research, they can be used to test the general relativity ...

For the first time, astronomers have directly observed a spinning black hole bending space and time, as predicted in Albert Einstein's theory of general relativity more than a hundred years ago. The ...