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It’s estimated that our galaxy is littered 
with 100 million small black holes created  

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from exploded stars, while the universe at 
large is flooded with supermassive black holes,  

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weighing millions or billions of times our 
Sun’s mass and found in the centers of galaxies. 

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A long-sought missing link between the two 
is an intermediate-mass black hole, weighing  

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in at hundreds to thousands of solar masses.
Astronomers, using NASA’s Hubble Space Telescope,  

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have possibly detected one of these elusive 
intermediate-mass black holes in the core  

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of the globular star cluster Messier 4, 
located 6,000 light years away from Earth. 

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They calculated the suspected black hole’s mass 
by studying the motion of stars caught in its  

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gravitational field using 12 and a half years’ 
worth of Messier 4 observations from Hubble.  

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The researchers estimate that the black hole 
could be as much as 800 times the mass of our Sun.

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Thanks to Hubble’s high precision 
observations over a long period of time,  

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scientists can search the skies to help us 
uncover the mysteries of this missing link,  

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and better understand our place in the universe.

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