Astronomers have seen the orbit of a star wobbling round a black gap—a spectacular dance within the cosmos that serves as one of many only a few direct confirmations of Einstein’s common idea of relativity revamped 100 years in the past. The end result, derived from periodic modifications in X-ray and radio emissions in a tidal disruption occasion, is actually a brand new window onto the workings of a spinning black gap that warps area and time round it.
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