From city-sized cores to monsters billions of times heavier than the Sun
In short: Black holes are not a monolith. They exist on a staggering scale, ranging from tiny objects that vanish before time feels meaningful to cosmic giants that anchor entire galaxies. Understanding these extremes reveals the violent lifecycle of stars and the mysterious evolution of our universe.
Astronomers primarily categorize black holes by mass into three distinct groups: stellar-mass, intermediate-mass, and supermassive. While these boundaries are approximate and subject to ongoing reassessment, they provide a framework for understanding how these objects form and behave. Beyond these three, cosmologists suspect the existence of a fourth type: primordial black holes, which may have formed during the very birth of the universe and remain largely undetected.
Stellar-mass black holes are the remnants of massive stars. When a star exceeding eight times the mass of our Sun exhausts its fuel, its core collapses and explodes as a supernova. If the remaining core is roughly 20 times the Sun's mass or more, it collapses into a stellar-mass black hole, which can weigh between a few and hundreds of solar masses. These are often found in X-ray binaries, where the black hole strips gas from a companion star, creating a disk hot enough to emit X-rays. Approximately 100 million might exist within our galaxy, despite only 50 being verified in the Milky Way so far.
At the opposite end of the spectrum are supermassive black holes, which reside at the centers of almost every large galaxy. These monsters range from tens of thousands to billions of solar masses. The black hole situated in Holmberg 15A possesses a minimum of 40 billion solar masses, whereas Sagittarius A* at our galaxy's core weighs 4 million solar masses. The origin of these giants remains a mystery, though some may have formed from the collapse of supermassive stars in the first billion years after the Big Bang, giving them a significant head start in growth.
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Sources
- Summary by Intellect · source: Every Type Of Black Hole Explained in 11 Minutes
- Also: Types - NASA Science
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