40 + 18 zeros: astronomers figured out the number of black holes of a “small” size

(ORDO NEWS) — A group of astrophysicists has found that there are 40 quintillion stellar-mass black holes in the observable universe, which is about 1% of the total amount of matter in the universe.

The researchers focused on stellar-mass black holes, the smallest known variety.

Counting all the black holes in the observable universe, which spans about 90 billion light-years, is a difficult task. To arrive at a total of 40 quintillion (a billion times a billion), the research team combined a new stellar evolution code called SEVN with data on the metallicity, star formation rate and size of stars in known galaxies.

Stellar-mass black holes are the smallest known, typically a few or a few hundred times the mass of the Sun.

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