Scientists were expecting to find an intermediate-mass black hole at the heart of the globular cluster NGC 6397, but instead they found evidence of a concentration of smaller black holes lurking there. New data from the NASA/ESA Hubble Space Telescope have led to the first measurement of the extent of a collection of black holes in a core-collapsed globular cluster.
The release, images and videos are available on:
https://esahubble.org/news/heic2103/
Kind regards,
ESA/Hubble Information Centre
11 February 2021
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