andthebeatgoeson
Junior Member
Nice, Jesus farts.
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Gravitational waves felt from black-hole merger 3 billion light-years away
- Thread starter GK86
- Start date
Thanks for the explanation. So forward time travel is possible but not backward i.e it was BS in movies
Both of these makes sense and I did knew about the ISS space station example. So if these guys in space are near a strong gravity mass, which will obviously pull them inside, but if they can somehow avoid it, they will experience time slower than the outside world.
If you haven't seen Interstellar you really should. Kinda does the time travel thing very well. It's a really good movie.
Just to put this into perspective, 3 billion light years away is far, far outside of our own galaxy. It's even further away than the nearest galaxy, Andromeda! Crazy to think we'd be able to detect something like this so far away flying through empty space or in another galaxy all together.
MrOogieBoogie
BioShock Infinite is like playing some homeless guy's vivid imagination
49 suns lmao
It's like equating console power to GameCubes taped together.
It's like equating console power to GameCubes taped together.
Earthbound64
Banned
I thought that's how we were still doing it?
But, yeah, "solar masses" and "solar units" are a bit silly.
You're right. I've edited my post to hopefully clarify.
DarkLordMalik
Member
I have seen Interstellar and yeh, it is a really good movie. Although it sucks in the last third act of the movie and the ending was crap.
True. That got me thinking, when Andromeda and Milky Way merge in a few billion years, will the supermassive black holes in the middle of each one also merge to produce these gravitational waves? And how much mass will they likely be at the instant they do merge. Like the Milky Way's black hole is over 4 million solar masses right now and I imagine Andromeda's is much larger.
I tend to agree with you but it had scientific accuracies in there so that's why I recommended it. Especially the time travel stuff.
Wasn't a fan of the their act tho but overall, really good.
I'm about to start watching this show, please tell me you didn't spoil anything.
Rip if true.
All Possible Ways
Member
Yes. I looked it up, and apparently Andromeda's black hole is about 10 times more massive than the Milky Way's. In the merger, some of the mass will be radiated away in the gravitational waves, such that the final BH will have less than the sum of the masses of two initial BHs. Simulations calculate that a couple million solar masses will be lost in this way.
All Possible Ways
Member
It is alphabetical, of course.
Ah yeah of course, forgot about the supernova ejection prior to the collapse.
RoyalLaFlame
Banned
Holy shit...
Basically our time doesn't apply to black holes, is that it?
This is so weird and fascinating.
GifGafIsTheBestGaf
Member
the crazy shit that happens so far away from earth and here we are already tired with the #covfefe meme
All Possible Ways
Member
It's not really a special property of black holes. Even on Earth, the time for someone on top of a mountain runs faster than for someone on the ground. GPS has to be calibrated to compensate for this. It's just that in the BH case these effects can be very strong.
RoyalLaFlame
Banned
backflip10019
Member
Muscle through the first season. S2 and S3 are among the best seasons of any TV show I've ever seen.
Hmmm
All Possible Ways
Member
I mean, to really get into the why you must study General Relativity. To give you the gist of it, the key point is that the gravitational field is really the geometry of space time. If you wish to calculate the distance between two points on flat space, with coordinates (x1,y1,z1) and (x2,y2,z2), you would use the pythagorean formula:
l^2= (x1-x2)^2+(y1-y2)^2+(z1-z2)^2.
In space time, a kind of distance, called the interval, may be defined similarly, but now you include also the time between the two events. In this case, if the times are t1 and t2, then the interval is
s^2= -(t1-t2)^2 +(x1-x2)^2+(y1-y2)^2+(z1-z2)^2
Note the crucial minus sign in front of the time term. This is the main difference between time and space.
Up to now, this is for flat space. Whenever you have you mass or energy, it deforms space time and changes the formula above, very roughly, by multiplying (you should really integrate) the (x1-x2)^2 and (t1-t2)^2 factors, etc by functions of space and time, which together form what is called a metric tensor.
For the gravitational field of the Earth, or of a Black Hole, the time difference squared is multiplied by (1-2 U(r)/c^2), where U(r) is the gravitational potential at the height r you are calculating and c is the speed of light.
Gamma Ray Bursts. You're thinking Gamma Ray Bursts. We could theoretically get smacked by a gamma ray burst from the collision of two stars merging into a black hole, which would be an instant and inevitable death that no one would see coming. Probably won't happen though.
RoyalLaFlame
Banned
I understand/knew all of this for sure.
I don't remember really why the minus (physics is not my major but I had some classes because engineering)
Now this is where you lost me. Metric sensor is not an unknown name to me but the rest, I have no clue ahah
But thanks for the explanation. I shall dig deeper into this when I have the time.
orientalNoodle
Banned
Would this be similar to hawking radiation where 1 solar mass worth of information disappeared from the universe as a form of gravitational waves?
thoseAREmySHOES
Member
I'm laughing more than I thought I would be from entering this thread
All Possible Ways
Member
Well the minus sign doesn't really matter for this, but it has to do with the difference between changes in velocity (which affect time) and rotations in space (which don't).
You're welcome
Information is conserved. Gravitational waves are not really any different from electromagnetic waves from a radio in this sense.
Yo mama so fat that she pulled in a black hole with weight equal to 49 solar mass.
Auto-Reply
Member
Thanks for the explanation. So forward time travel is possible but not backward i.e it was BS in movies
Both of these makes sense and I did knew about the ISS space station example. So if these guys in space are near a strong gravity mass, which will obviously pull them inside, but if they can somehow avoid it, they will experience time slower than the outside world.
Afaik, they wont experience it any different than before. Time for them only slows down relative to a different state of spacetime. There is no general standard spacetime, you could argue for humans it is the state on the surface of the earth and anything else is not normal for us but that is only a thought construct. You look at them and they seem to slow down, but they look at you and they see you accellerating, you both look at your watch and it ticks away as usual, nothing different. I might remember this wrong but that is kinda how the twin paradox could be interpreted.
DarkLordMalik
Member
Yes, I understand it. This is also why I loved Interstellar since the beginning dealt with exactly this subject. Hopefully we get another movie with similar scientific accuracy sometime in the future.
FantasticMrFoxdie
Mumber
Hah. Not even close.
Watch the show though. Best show of the year so far
KraftyKrankins
Member
Is that why I woke up at 5am this morning? Gee, thanks universe!
RandomHopeInc
Member
Earth should have sold stock when it had the chance
Randomizer
Member
No, unless I missed something? The show is mainly about the characters anyway not particularly about explaining anything. Similar to Lost in that regard and no surprise it's from the same guy. The Leftovers is much better than Lost though.
GiantEnemyGoomba
Member
Are there theories about what it is exactly that's making up the wave aside from just "space-time?" Or I guess is there any good reading on this that I could somewhat understand as someone with a basic grasp of mechanics and electromagnetism?
All Possible Ways
Member
It is just space-time in the same way that an electromagnetic wave is just as oscillation of the electromagnetic field. There's nothing underneath, so to speak.
If you want a more technical explanation, the oscillating field is called the metric tensor. It is a 10 component field that tells you how to measure distances in curved spacetime.
Conciliator
Banned
hey I pulled out my calculator and added this up and it should be 50 solar masses. nice try scientists
All Possible Ways
Member
You're probably joking, but the solar mass that is missing was radiated away. It's in the energy of the waves.
Agent_ShortBus
Member
How powerful is this in DBZ power levels?
AlexFlame116
Member
I love astronomy and anything to do with space so all this talk fascinates me. What I would give to see all these cosmic things up close with my own eyes. Stars, nebulae, the planets, the galaxies, etc.
That math equation that someone posted hurts my head though.
That math equation that someone posted hurts my head though.
This event released more energy than all the stars in the observable universe, so it's definitely over 9000 at least.
I HIGHLY recommend watching this video to get a sense of just how absurdly small this measurement is:
https://www.youtube.com/watch?v=iphcyNWFD10
https://www.youtube.com/watch?v=iphcyNWFD10
Rentahamster
Rodent Whores
Yeah, with a massive enough black hole. That's the concept behind the gentle singularity in the movie Interstellar.
Vincent Alexander
Member
It's about 10 billion Yamchas.
Mohonky
Member
Basically someone watching you enter a black hole would appear to almost be not moving at all.
Theorhetically as you enter the horizon you could look back and see them moving faster, but light is being bent so greatly you could actually be able to see shit like the back of your head and your lower half would seem to extend forever....at least until you kond of get crushed into oblivion.
So coooool. This is the third time we've detected gravitational waves. The science going into detecting them is super cool as well. It's just a simple Michelson Interferometer, yet it has to detect variations in space that are smaller than an atom.
To be entirely fair, the chance of an extinction level asteroid hitting the Earth (unless we can move it) is very high. The chance of it happening in the next 10,000-100,000 years, however, is very low.
To be entirely fair, the chance of an extinction level asteroid hitting the Earth (unless we can move it) is very high. The chance of it happening in the next 10,000-100,000 years, however, is very low.
And these are stellar mass black holes. The energy released by two supermassive black holes merging would dwarf this by many, many orders of magnitude. It's crazy how the real world is far more insane than most fiction.
Vincent Alexander
Member
This shit is insane. Every single part of it.