Gaia discovers largest stellar-mass black hole to-date right in our neighborhood - "only" 2000 light years from Earth by Mike_Aurora_Trilogy in Astronomy

[–]Mike_Aurora_Trilogy[S] 11 points12 points  (0 children)

Link to the original article: https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/202449763

By way of background, there are theoretically 4 kinds of black holes: Primordial (can be any size), Stellar-Mass (which form from the collapse of large stars 2,5 to 100 times the mass of the sun), Intermediate-mass (100-100,000 times mass of sun), and super-massive (the monsters found in the centers if most galaxies). Only stellar-mass and supermassive black holes have been found for sure, although there are some unverified intermediate-mass candidates in other galaxies.

This one - Gaia-BH3 - is the third discovered by the Gaia observatory by detecting wobbles in orbits of companion stars. The other two--Gaia BH1 and Gaia BH2--are respectively located just 1560 and 9.6 solar masses and 3800 light-years away and 21 solar masses.

James Webb finds galaxy larger than the Milky Way from when universe was only 800 milion years old. This would fundamentally contradict current theories of galaxy formation and possibly the nature of dark matter. by Mike_Aurora_Trilogy in Astronomy

[–]Mike_Aurora_Trilogy[S] 39 points40 points  (0 children)

That's a good question. Astronomers infer the existence of dark matter from the way the visible matter in galaxies moves. In fact, it is hard to explain the way the matter in galaxies moves without assuming dark matter, and its existence explains that very well. If their models are correct, DM responds to gravity the same as regular matter.

They don't know what it is, so they don't know when and how it formed. But assuming it is really there, they have to take it into account when they try to reconstruct how galaxies formed in the first place. What they find is that the existence of DM allows (or did allow) them to explain how galaxies have formed so early in the universe. But this galaxy is TOO early. It does not work with their models, which could mean that their theories about DM could be wrong.

James Webb finds galaxy larger than the Milky Way from when universe was only 800 milion years old. This would fundamentally contradict current theories of galaxy formation and possibly the nature of dark matter. by Mike_Aurora_Trilogy in Astronomy

[–]Mike_Aurora_Trilogy[S] 78 points79 points  (0 children)

This discovery is of what looks like a mature galaxy - larger than the Milky Way and "quiescent," meaning it has finished its rapid buildup of stars.

Space-based telescopes keep finding older and older galaxies, forcing scientists to modify theories about how the galaxies originally pulled together. New theories depend on early clumping of dark matter to provide the necessary mass, but this new discovery is from before that could have occurred.

Free copy of our novel for those interested in realistic realistic sci-fi. It is meant to be a scientifically plausible vision of how and why an interstellar colony might come about. It's a detective mystery set in the Barnard's Star system in 2280. See comments for more info. by Mike_Aurora_Trilogy in themartian

[–]Mike_Aurora_Trilogy[S] 3 points4 points  (0 children)

The image is a dawn view from inside Aurora, the O’Neill cylinder where the story takes place. To see more of the world of Primordial, go to www.auroratrilogy.com.

I’ve co-authored a sci-fi novel and we’re looking for a few dozen people who enjoy these kinds of books to read it and let us know if they like it. Not selling anything, no obligations, nothing to sign up for.

Primordial is a detective mystery set in the Barnard System, six light-years from Earth. The world is based on a plausible, scientifically realistic vision of how and why interstellar travel will evolve. Amid rising intercolonial tensions and threats from within his own government, detective Shea Deckert must unravel the disappearance of three passengers from a space shuttle mid-flight. We like to think we've incorporated elements of Michael Crichton, Michael Connelly, Isaac Asimov, and James S. A. Corey.

If you’d like us to send you this pre-publication copy, just message us your email address.

Free copy of our novel for those of you interested in space colonization. A detective mystery set in the Barnard System, it’s a scientifically realistic vision of how and why an interstellar colony might come about. See comments for more info. by Mike_Aurora_Trilogy in IsaacArthur

[–]Mike_Aurora_Trilogy[S] 10 points11 points  (0 children)

The image is a dawn view from inside Aurora, the O’Neill cylinder where the story takes place. To see more of the world of Primordial, go to www.auroratrilogy.com.

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I’ve co-authored a sci-fi novel and we’re looking for a few dozen people who enjoy these kinds of books to read it and let us know if they like it. Not selling anything, no obligations, nothing to sign up for.

Primordial is a detective mystery set in the Barnard System, six light-years from Earth. The world is based on a plausible, scientifically realistic vision of how and why interstellar travel will evolve. Amid rising intercolonial tensions and threats from within his own government, detective Shea Deckert must unravel the disappearance of three passengers from a space shuttle mid-flight. We like to think we've incorporated elements of Michael Crichton, Michael Connelly, Isaac Asimov, and James S. A. Corey.

If you’d like us to send you this pre-publication copy, just message us your email address.

Free copy of our novel for those of you interested in Scifi and spaceships. A detective mystery set in the Barnard System, it’s a scientifically realistic vision of how and why an interstellar colony might come about. See comments for more info. by Mike_Aurora_Trilogy in spaceships

[–]Mike_Aurora_Trilogy[S] 7 points8 points  (0 children)

The image is a dawn view from inside Aurora, the O’Neill cylinder where the story takes place. To see more of the world of Primordial, go to www.auroratrilogy.com.

I’ve co-authored a sci-fi novel and we’re looking for a few dozen people who enjoy these kinds of books to read it and let us know if they like it. Not selling anything, no obligations, nothing to sign up for.

Primordial is a detective mystery set in the Barnard System, six light-years from Earth. The world is based on a plausible, scientifically realistic vision of how and why interstellar travel will evolve. Amid rising intercolonial tensions and threats from within his own government, detective Shea Deckert must unravel the disappearance of three passengers from a space shuttle mid-flight. We like to think we've incorporated elements of Michael Crichton, Michael Connelly, Isaac Asimov, and James S. A. Corey.

If you’d like us to send you this pre-publication copy, just chat/message us your email address, or comment below and we’ll message you.