If you’ve ever wondered how much a massive black hole weighs, the answer is that the Sun next to it looks like a marble.

“What am I going to have for breakfast today?” when will this heat pass” and “how much does a black hole“are those three questions that you will surely ask yourself every day when you wake up. For the first two the answer is uncertain, but for the third a group of researchers from Carnegie Science in California has the answer. Because they have just measured, for the first time, the mass of an inactive black hole that dates back to the early universe and they do not give the answer in tons because it is a figure that escapes human understanding.

But they do give the mass compared to the Sun and… well, it’s still not something we can assume.

The weight of a black hole. The results HE they published this past Thursday in Science magazine and they are clear: a black hole located in the center of the galaxy MRG-M0138 has about 6,000 million times the mass of the Sun. The mass of our star is 2 × 10^30 kg, equivalent to 332,946 times the mass of the Earth.

Does this leave you calmer? Surely not because it is like when they tell us that one company buys another for 75 billion dollars: These are such absurd quantities that it is very difficult to get the idea of ​​what it entails, but this thing about weighing bodies around the universe makes sense.

Fascinatingly, MRG-M0138 is a massive galaxy whose light has traveled to our sensors from a time when the universe was only about 3 billion years old. This galaxy is no longer forming stars and the central black hole is “quiet.”

The scale spacel. To achieve the measurement, the team at the Californian center used the James Webb Space Telescope (JWST) to track the movement of stars around the cosmic giant. It is not the first time that the mass of a black hole has been calculated, but it is the first time that it has been done with one that is so far away (10,000 million light years from Earth, 15 times further than the previous measurement record) and, in addition, it is the first time that an inactive black hole in a galaxy of the early universe.

This speaks very well of the benefits of the JWST, which with its sensors allows a very defined image of extremely distant bodies, opening up a huge range when it comes to studying what surrounds us. The problem with sleeping black holes is that they are invisible. It does not emit light, so it cannot be observed directly.

So, to “weigh it,” the researchers used a technique that had already been used before: stellar dynamics. Basically, they look at the speed at which stars move near the galactic center and compare that speed to that of more distant stars. In this way, they infer the mass of the black hole.

So that. To continue knowing what surrounds us, basically. Because it is not just about measuring the mass of something so distant, but about understanding the formation around it. Thus, this discovery offers new clues to researchers about black holes and galaxies that were born in the early universe.

A look at the future by looking at the past. Because, until not long ago, it had been difficult to prove whether there was a close relationship between the central black holes of these very old galaxies. Recent findings suggest that those denser galaxies were sites of rapid black hole growth early in the history of the cosmos.

Furthermore, this research will be the basis for future work that will delve into this relationship and, above all, it will also be the basis for analyzing the data collected by the JWST in other similar galaxies. In fact, although the JWST is a good cosmic “magnifying glass”, in Chile the observatory is being expandedThe Bells‘ which is supported by Carnegie Science and will allow studying stellar movements in distant galaxies in much more detail than what JWST offers.

In the end, it is about continuing to understand the universe and studies like this allow us to test theoretical methods to understand how massive black holes formed, grew, shaped the evolution of galaxies and, ultimately, became silent giants.

Image | Navid Marvi/Carnegie Science

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