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Massive black hole discovered near heart of the Milky Way (NOT Sagitarius A*)
- Thread starter Insane Metal
- Start date
All Possible Ways
Member
For spinning black holes, you could in principle go through the inner horizon inside it and come out in another universe. Most likely this is not possible however because this doesn't take into account that an enormous amount of energy gets accumulated in the inner horizon and prevents anything from crossing.
You know, this is a very important problem. In physics information cannot be destroyed, but it appears that if something falls into a black hole, its identity is completely erased. This is called the information paradox.
Since Hawking predicted that black holes slowly evaporate by emitting a faint radiation, it is conjectured that the information of what fell in is stored in the particles that come out and so is preserved overall. In some idealised cases, where people can do the calculation, it seems to be true, but it remains an open problem in general.
foxuzamaki
Doesn't read OPs, especially not his own
Has this been put in elite dangerous yet
Earthbound64
Banned
It's my hole, it was made for me.
Anyway, we'd need to be near enough to it such that its effects were stronger on us than our acceleration away from it due to other forces (gravity of other objects, etc.)
Hawking did concede defeat on his wager, though.
BMO = GOAT
Member
🤔 always wanted to know what truly happens when something gets eaten by black holes. Wouldn't mind risking my life for science and curiosity tbh.
You won't know because you'll either die instantly or experience a boring moment infinitely.
Insane Metal
Member
Understanding. Humans want to know more.
BizzyBum
Member
That's what's crazy, because to him he would die instantly, but to the outside observer, wouldn't he be appearing to be suspended on the horizon indefinitely due to time dilation?
All Possible Ways
Member
This is state of the art research. The question is not yet settled. It is true, however, that most people today believe the information must be preserved in the end.
You are right. From the perspective of the infalling observer, it takes only a finite amount of time to reach the singularity. His time is only dilated with respect to a stationary observer outside.
TheContact
Member
Yea and we don't know what came first--the chicken or the egg so to speak
He conceded in 2005, though, tipping his hat to AdS/CFT (anti-deSitter space and conformal field theory, a hybrid of special relativity + quantum), which is the most successful (and most heavily cited) version of holography. This solution has satisfied most* theoretical physicists.
*my friend is working on a new, fundamental theory of physics that will challenge everyone's understanding of the universe, including our understanding of black hole behavior. So, yes, it's still a hotly researched topic.
Always-honest
Banned
Nah we'll just be stuck in an infinite bookshelf for forever. We're allowed to do morse code there though.
What if it has killed us, but due to time dilation we don't even know?
1.4 trillion miles? In place of the sun in our solar system, that would almost reach Saturn.
My first thought. I want to visit!
My first thought. I want to visit!
CassidyIzABeast
Member
That's the size of Snoke's next ship.
CarlisleDavid1979
Member
neurosisxeno
Member
1.4 trillion km I believe (so around 870 billion miles or freedom units as noted above) if that estimate is correct. But most importantly, 870 billion freedoms is way bigger than sun to Saturn. The distance from the sun to the farthest planet Neptune is 'only' 2.9 billion freedoms. Hell, the diameter of the solar system, including the massive Oort cloud is less than 6 billion freedoms.
This black hole would be 145x the entire size of the solar system and 310x the size of the solar system if we're just talking sun to the farthest planet! Defies comprehension, particularly because Sagitarius A* is estimated to fit in between the sun and Mercury from last I remembered (<46 million freedoms).
So something doesn't add up here.
ThanosOTitan
Banned
Black holes are they way they are because of the amount of mass in a small space. Mass and size are different things
All Possible Ways
Member
I'm well aware. You can include me in the satisfied camp.
Btw, love your short film. Keep up the good work!
Nah, that'd be a supernova. Get hit by a big blast of gamma rays, sterilise the planet and we'd never know it happened unless a telescope was pointing in the right direction when the star went bang.
You have to get preeeetyyyy damn close to a black hole (astronomically speaking) to fall into the gravity well, and even then only about 2% of the material will pass the event horizon, the rest either being trapped in orbit or ejected at >.7c.
Something like a neutron star being sucked into a singularity, or two neutron stars colliding...yeah, actually scarier than a black hole in terms of the energy released...
TheOfficeMut
Unconfirmed Member
If you haven't already, please pick up 'The Science of Interstellar' by Kip Thorne.
It not only gives you insight into how the movie came to be, but it delves into the intricacies of black holes, warm holes and other phenomena. I'm almost done with it. I can never get enough of books on astronomy, specifically black holes. I've read maybe 10 books on the topic. It's all so fascinating.
It not only gives you insight into how the movie came to be, but it delves into the intricacies of black holes, warm holes and other phenomena. I'm almost done with it. I can never get enough of books on astronomy, specifically black holes. I've read maybe 10 books on the topic. It's all so fascinating.
Indeed, so that's why a 1.4 trillion km 'across' black hole sounds like someone messed up their units and a couple powers of 10. A black hole that fits in your pocket would have many several times more mass than the earth (and consequently gravity). One with the mass of our sun would only be a couple miles. So a black hole that has a diameter that is about 1/7th of a light year inside our own galaxy sounds impossible. I don't even think our galaxy (or Andromeda and any neighboring satellite galaxies) would exist with such a monster.
Joke of the year.
Earthbound64
Banned
No, not really. It was fairly predictable/cliché.
Elfotografoalocado
Banned
It doesn't cease to exist. A black hole is a sphere of matter, so the matter that falls into it would add up to the black hole. The only thing that makes the black hole special is that it's so dense it has such a gravitational pull that not even photons can escape.
So anything that falls in there just gets crushed really small and added up to that sphere of mass.
Simon Belmont
Banned
That 1.4 trillion kms is either off by a factor of 1000, or that's the size of the gas cloud they found it in. That's all I've got.
SargerusBR
I love Pokken!
Mass Effect 2 was right
There actually is an update around the corner. Thargoids baby! Also, I think it's great how they stay on top of discoveries like this and add them to the game.
Considering Sag A* is only 44 million km in diameter I don't think it has anything to do with the size of the black hole.
Simon Belmont
Banned
Yeah. Which I why I said unless that number is off by a factor of 1000 they're probably talking about the gas cloud.
Although the Crab Nebula is 11ly across, so maybe 1.4 trillion kms is small for a giant gas cloud.
Edit: reread the article, the cloud is 150 trillion kms, and the black hole is no more than 1.4 trillion kms across according to computer models, which I think we can safely assume is way, way off (or MACHOs are about to make a huge comeback)
All Possible Ways
Member
About the size, they say it has about 10^5 solar masses, so you can just calculate the radius to be about 150 thousand km. The number reported is most likely just an upper bound.
hydrophilic attack
Member
CyclopsRock
Member
I read an interesting thing on Reddit the other which helped, a tiny bit, to put the scale of the universe into perspective. It was a photo of a milometer (though it was in Kilometers, so I dunno what you call them) of a truck and the truck had travelled 299,792, or about 186,282 - and by doing so, it had travelled exactly the same distance as light travels in one second.
Armoured Priest
Member
This.
Fun fact: If you compressed all of the mass of the Earth down into a sphere with a 4mm radius, the Earth would become a black hole.
Regular Earth and BH Earth have the same gravitational pull, because they have the same mass. However, BH Earth has an escape velocity exceeding the Speed of light due to it's effect on local time-space. It's smaller size-yet equivalent mass has a dramatically greater warping effect.
Simon Belmont
Banned
It's like Grahams number. The answer is somewhere between 13 and "holy god what hath you wrought"
TheThreadsThatBindUs
Member
...or maybe you're not a white guy?
The reason light can't escape is really much more bizarre than simply saying a black hole has a high "escape velocity". Beyond the event horizon, spacetime is curved so much that no path even exists that doesn't lead into the center
Can you explain more on this?
Edit: Yes, I'm serious. I'm a bit confused especially per the previous post
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