ARGOMENTO: There are 40 trillion trillion black holes in the

How many black holes are there?

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I don't mean close to the sun. or even in the galaxy I mean, how many black holes are there in the entire observable universe?It turns out that there are about 40 billion people.For those who like numbers, that's 40,000,000,000,000,000,000. In exponential form, it is 4 x1019.

In English, that's really bad. That's a lot of black holes.When I first read this I had to think about it for a moment, but it actually sounded right. And it wasn't built, it was calculated: that's what a team of scientists came up with when they crunched the numbers. (Link to paper)

That wasn't really their end goal. what they really want is the mass function of the black hole during cosmic time.Artwork based on actual Hubble observations of NGC 6397 showing a swarming black hole in its core. Credits: ESA/Hubble, N. Bartmann.