A Dark Central Mass is Lurking at the Hub of a Glittering Stellar Island Gravitational traps in space, black holes, come in different sizes. Or more correctly, different masses, because they are all infinitely small. The first black hole ever discovered, in 1971, weighed in at 21 times our Sun's ma
A Hubble Space Telescope image of the globular star cluster, Messier 4. The cluster is a dense collection of several hundred thousand stars. Astronomers suspect that an intermediate-mass black hole, weighing as much as 800 times the mass of our Sun, is lurking, unseen, at its core. Credit: ESA/Hubble, NASA, Eduardo Vitral Gravitational traps in space, black holes, come in different sizes. Or more correctly, different masses, because they are all infinitely small.
The cores of globular star clusters are hunting grounds for intermediate-mass black holes. They are smaller than galaxies and should have correspondingly smaller black holes. Over 150 of these snow-globe-shaped collections of hundreds of thousands of stars orbit ourgalaxy, like artificial satellites whirling around Earth. Searches for intermediate-mass back holes in these clusters have been elusive. The suspected central black hole can’t be directly observed, of course.
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