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The possible disappearance of a massive star in the galaxy PHL 293B

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Re: The possible disappearance of a massive star in the galaxy PHL 293B

#21
post #18
post #16

So they hypothesize it either collapsed to a black hole without supernova or stopped fusion. They don't mention it might just might have been swallowed by black hole.

Wouldn't that be a slow process?

That is my impression also. Stars/objects being swallowed by black holes tend to emit a large amount of radiation as it happens, over longer periods. Someone correct me if I'm wrong.

Re: The possible disappearance of a massive star in the galaxy PHL 293B

#22
post #21
post #18

Earlier quoted context omitted.

Wouldn't that be a slow process?

That is my impression also. Stars/objects being swallowed by black holes tend to emit a large amount of radiation as it happens, over longer periods. Someone correct me if I'm wrong.

Maybe stupid question - what would happen to the star, if it actually 'collided' with black hole - ie black hole flew right through its core, not just casually going nearby, trapping each other and black hole slowly sucking it dry?

I would expect the thing to be over rather swiftly, albeit probably with some accretion disc still generating some radiation.

Re: The possible disappearance of a massive star in the galaxy PHL 293B

#23
post #10

Earlier quoted context omitted.

If you are into these kinds of mysteries, I highly recommend reading Pandora's Star by Peter F Hamilton. (even more so if you want to spend a few days reading this epic space opera)

Warning: he writes huge tomes. They're far too long. The first I read was fun, the second a slog. There won't be a third.

He has a whole follow-up trilogy from Pandora's Star. They are every bit as massive and pondorous. I personally liked them just enough to finish them, but I won't re-read them.

However, I absolutely love the Night's Dawn Trilogy and re-read it once every few years. I think I read it at an impressionable age and it really stuck.

One could also consider reading Charles Stross' "Accelerando" which has plenty of stuff about dyson swarms.

Re: The possible disappearance of a massive star in the galaxy PHL 293B

#24
post #10

Earlier quoted context omitted.

IANAP and this could be a bit of a stretch, but could the disappearance of the star been caused by the completion of a Dyson sphere around it?

If you are into these kinds of mysteries, I highly recommend reading Pandora's Star by Peter F Hamilton. (even more so if you want to spend a few days reading this epic space opera)

I only read Pandora's Star so far, but I really liked the fact that it was a rather optimistic vision of the future. Humanity had colonies on dozens or hundreds of planets, and due to life extension people were basically immortal and could even choose the shape of their body.

Re: The possible disappearance of a massive star in the galaxy PHL 293B

#26
post #15

Earlier quoted context omitted.

Could you point to any laymanish articles or media that talks about the non-supernova fate? My knowledge about supernovae, black holes and neutron stars all come from youtube channels ( eg. https://youtu.be/RZkR9zdUv-E ) and they make it sound like inevitable ends for massive stars, because once the neutron star forms the sudden vacuum created by the compacted neutrons makes all the matter around it collapse on it an…

It’s totally plausible. But if the core of your star is sufficiently massive then the initial collapse takes it over the Chandrasekhar limit & it forms a black hole immediately. Then the rest of the stellar material just falls into it. The fine details vary depending on mass, composition & spin of the rest of the material: if the star is spinning fast enough an accretion disk might form and drive jets which is one po…

>> Then the rest of the stellar material just falls into it.

Spherical chickens in a vacuum. This would be true of a non-spinning black hole. In reality they all spin. The star was spinning before collapse. So a tiny amount quietly falls in, but the bulk of the outer shell quickly accelerates, energizes, jets form and generally the massive releases of energy blasts material away.

Re: The possible disappearance of a massive star in the galaxy PHL 293B

#28
post #9

Earlier quoted context omitted.

IANAP and this could be a bit of a stretch, but could the disappearance of the star been caused by the completion of a Dyson sphere around it?

It would be; first, spheres are unrealistic because of the stresses involved, so you'd be looking at a dyson swarm instead, and second, (and this is with sci-fi glasses on), even advanced civilizations would need many years to build one, so there would be a gradual fading instead.

It could be the result of the closing of the dyson sphere/swarm. If the dyson sphere/swarm is built like giant Venetian blinds, it could work.

Re: The possible disappearance of a massive star in the galaxy PHL 293B

#29
This sounds like the plot of Pandoras Star by Peter F Hamilton

At the farthest edge of the Commonwealth, astronomer Dudley Bose observes the impossible: Over one thousand light-years away, a star... vanishes. It does not go supernova. It does not collapse into a black hole. It simply disappears.

Lets hope its not the [[SPOILER]]

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