Left: Two supermassive black holes are spiralling towards each other near the centre of galaxy cluster Abell 400. This X-ray/radio composite image shows the multimillion-degree radio jets emanating from the black holes. (Credit: X-ray: NASA/CXC/AIfA/D Hudson and T Reiprich et al.; radio: NRAO/VLA/NRL) Right: A 3-D simulation of merging black holes and the spreading gravitational waves. (Henze, NASA)
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