Comment on well?
atomicbocks@sh.itjust.works 13 hours agoOn the contrary; while I have heard the explanation that the commenter you replied to has said I have also heard a slightly different theory:
Our universe is the 3 dimensional event horizon of a 4th dimensional black hole. By extension we may find that black holes in our universe have similar funky 2 dimensional areas at their even horizons.
I am sure clickbait articles are part of it but there also seems to be several actual theories surrounding the idea of the nature of our universe relating to black holes.
beejboytyson@lemmy.world 13 hours ago
Our universe is 4 d not 3 d
Cethin@lemmy.zip 2 hours ago
Three spacial dimensions, which is normally what people mean when they say that, unless they specify otherwise. For example, we call them 3D game engines, not 4D. Yes, there’s also a time dimension that is special. It cannot be moved through freely.
MotoAsh@lemmy.world 12 hours ago
3+1, not 4D (we cannot move freely in time). They’re referencing the holographic universe theory, or holographic principle. PBS Spacetime has a good episode on the holographic universe theory.
TexasDrunk@lemmy.world 12 hours ago
YOU can’t move freely in time. Don’t speak for me.
Ok, I can’t either. But still…
ouRKaoS@lemmy.today 11 hours ago
I think I can move freely in time, just not voluntarily…
Sometimes I go through a whole day in like a minute, sometimes I blink and it’s Monday already.
Or maybe it’s working nights has that effect?
beejboytyson@lemmy.world 5 hours ago
You move through time every second…
Donjamos@lemmy.world 12 minutes ago
Walk in the other direction then, let’s see how that goes.
vala@lemmy.world 8 hours ago
Nah, this universe is 3d.
I’m assuming you are thinking that time is the 4th dimension and we have time here so we are 4d?
Time may be the 4th dimension, but in our universe, time doesn’t actually behave like a proper dimension. For one thing, dimensions should be spatially perpendicular to each other and time is not. We also seem to only be able to move one way through time whereas we can move back and forth through the other 3 dimensions.
Dimensions get weird and complicated. For the intents and purposes of this conversation it’s correct to say that the universe were experiencing now is 3 dimensional.
beejboytyson@lemmy.world 5 hours ago
That’s actually a crazy take that time isn’t a dimension. We’ll if someone say the sky is purple who am I to argue?
PleaseLetMeOut@lemmy.dbzer0.com 12 hours ago
Yes, but if you’re beyond the event horizon time becomes basically* irrelevant. You could literally turn around, look back out towards the rest of he universe, and watch all of time play out in the blink of an eye.
You know that scene in Interstellar where they land on the planet for 5 minutes, but 20 years passes for everyone else due to the planet’s mass? It’s the same thing, but a billion-billion-billion times more severe.
Cethin@lemmy.zip 2 hours ago
No, time does not become irrelevant. It’s perfectly normal for things inside the black hole. Here’s the space time diagram for our universe on the right, and a black hole at the top-left. The speed of light is a 45° angle to the top right, and the solid lines are event horizons. Notice the space-time diagram looks exactly the same on the other side of the horizon. To get back through though you’d have to travel faster than that 45° angle, which is impossible.
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PleaseLetMeOut@lemmy.dbzer0.com 50 minutes ago
I’m aware of the Penrose diagram and I also watch PBS SpaceTime :)
But I was referring more to the frame of reference of our universe vs that of being inside a blackhole (assuming you could magically avoid being ripped apart by gravity). To an observer inside a blackhole, “time” on the outside would blink by almost instantly. Hence the Asterisk on basically*.
I was leading them to what MotoAsh posted. But they beat me to it while I was typing.
webghost0101@sopuli.xyz 13 hours ago
Do you have any idea how little that narrows things down?