Scientists find clump of black holes inside the heart of globular cluster (video)

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The globular cluster NGC 6397, a conglomeration of stars about 7,800 light-years from Earth, likely harbors a clump of small black holes at its heart, a new study reports.

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A tight knot of stars nearly as old as the universe hides a dark secret at its core.
The globular cluster NGC 6397, a conglomeration of stars about 7,800 light-years from Earth, likely harbors a clump of small black holes at its heart, a new study reports.
Researchers studied the movement of stars in NGC 6397 using NASA's Hubble Space Telescope and the European Space Agency's Gaia spacecraft. These motions revealed the existence of a hidden mass at the cluster's center — a "central dark component" that makes up 0.8 to 2% of NGC 6397's total mass.
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Is this unusual?

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