14:07: That bit at the end is not an advertisement. It's about the "necessary inaccuracies" in the video. It belongs to the video, since it tells that some things of the video aren't that clear. I think they did it better in "The largest stars", because they included that bit into the main part, so that people would not click away before seeing this. I really recommend watching it, because it's interesting. Here's the script to show you: "Let’s try something new today, we can call it: “Behind the Lies”, a short behind the scenes bit about the necessary inaccuracies in this video - because it's really not actually possible to rank black holes like trading cards. How so? Well, while we have catalogued millions of stars, we really only have good data on a couple of dozen black holes. That’s because black hole gazing wasn’t really a thing until 50 years ago - and technically still isn’t, because we can’t see black holes. We can only derive their properties from studying their gravitational effects on the matter around them, like the orbit of stars that come close to them. This effect depends on the mass of the black hole, which we can approximate at the most basic level with Kepler’s Laws. But this comes with huge uncertainties and error bars. Then we have to convert mass to size next, which brings new uncertainties. For example, we calculated the radius from the mass using the Schwarzschild equation which for the sake of simplicity assumes black holes are perfectly round and don’t spin: a kind of black hole that doesn’t really exist. The reality is that physics on these scales is a bit fuzzy. So some of the black holes we talked about here may be way smaller or way bigger. We just don’t know for sure. We shimmied around this problem by comparing different sources with different kinds of values and using different mass calculations to arrive at a standardized list that allowed us to be as accurate as humanly possible. You can look at all of this in our source doc. As a result this script was written with the tears of experts we drove crazy with our obsession for the best values they could live with."

5:03 observable universe is 93B light years in diameter btw, but we're still seeing the objects 46B light years away from us as though they're from 13.7B years ago

fun fact: there's black holes that are bigger than TON 618. (kinda) these include: 3. Pheonix A 2. Abell 1201 1. S5 0014+81

Forget TON618. An even larger black hole was found with around 100 billion solar masses. Name "Phoenix a"

PLEASE what is something by in a nutshell kurzgesagt!!!

The first GW detection was a merge of two black holes 1 billion light years away… not 17

Fun fact about black holes: small black holes are far denser than large ones. This is because the radius of a black hole scales linearly with its mass, at roughly three kilometres per solar mass. TON 618 has a density of just over five grams per cubic metre, lower than that of hydrogen gas.

However due to the expansion of the universe, the observable universe (how far we can receive light from) is 90 billion lightyears across. 5:04

the gravitational waves we detected are 17 billion light years away because the Universe has expanded since then. They are 17 billion light years away now, but were a lot closer when they emitted that gravitational wave energy. Even though the Universe is 14.something billion years old, it is 93 billion light years in diameter due to expansion.

youre way to underrated! i hope you get more subs!

That's not true. They're suggesting that the Radio Lobes stretch "...half a million light years in diameter. That is 2.5 Milky Ways wide." No! From what I've read, the Milky Way has a diameter of around 80,000 light years. That's a pretty massive difference!

Did you know kurzgesagt in german means in short? Since they put this stuff in short, consumable videos, the title fits well

Try searching for the black hole PHEONIX A

Hey, we actually can use black holes as an energy source. kurgzgesaegt he has a video on how to take energy from a black hole

13:18 Lesson Learned Here You are insignificant.

If we could harness the tidal forces of a black hole, just this would be a mind numbing amount of energy and all without getting into energy from radiation yet. Might even be able to heat water into steam directly just by having water orbit a black hole in a pressurized container of a sort. So many possibilities for black hole energy; it gives me an engineer boner just thinking about it :3

Imagine you as a big jacked body builder getting bullied by a little boy

When it comes to energy, antimatter is the key. Once we figure out ways to make the process less expensive, time consuming and energy intensive we will have a energy source like no other. Of course in the long long long long long future if we survive we can definitely harvest black holes for energy using a very sophisticated, high tech, revolutionary awe-inspiring.... mirrors.. yup just a lot of mirrors. Cant remember where I got that information from, probably Kurzgesagt lol.

phoenix A blackhole Largest than Ton 618

GOD is real!

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Aww man why the fk would you cut that end off without checking what it was