News & Views A technique called reverberation mapping has previously been used to probe the structure of matter around supermassive black holes. Observations reported in Nature suggest that this technique can also be applied to much smaller black holes.

News & Views: A technique called reverberation mapping has previously been used to probe the structure of matter around supermassive black holes. Observations reported in Nature suggest that this technique can also be applied to much smaller black holes.

News & Views: A technique called reverberation mapping has previously been used to probe the structure of matter around supermassive black holes. Observations reported in Nature suggest that this technique can also be applied to much smaller black holes. https://go.nature.com/2QzP2iV 

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