Comment on well?

• Cethin@lemmy.zip ⁨8⁩ ⁨months⁩ 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.

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  • beejboytyson@lemmy.world ⁨8⁩ ⁨months⁩ ago

    How not? Do you not save your progress? Do you not old up old files? Really think bud

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• vala@lemmy.world ⁨8⁩ ⁨months⁩ 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.

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  • beejboytyson@lemmy.world ⁨8⁩ ⁨months⁩ 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?

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• PleaseLetMeOut@lemmy.dbzer0.com ⁨8⁩ ⁨months⁩ 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.

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  • Cethin@lemmy.zip ⁨8⁩ ⁨months⁩ 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 ⁨8⁩ ⁨months⁩ 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.

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• MotoAsh@lemmy.world ⁨8⁩ ⁨months⁩ 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.

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  • beejboytyson@lemmy.world ⁨8⁩ ⁨months⁩ ago

    You move through time every second…

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    • Donjamos@lemmy.world ⁨8⁩ ⁨months⁩ ago

      Walk in the other direction then, let’s see how that goes.

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      • beejboytyson@lemmy.world ⁨8⁩ ⁨months⁩ ago

        That not how you do it. Watch a documentary called edge of all we know. Someone much smarter then you has that opinion.

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  • TexasDrunk@lemmy.world ⁨8⁩ ⁨months⁩ ago

    YOU can’t move freely in time. Don’t speak for me.

    Ok, I can’t either. But still…

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    • ouRKaoS@lemmy.today ⁨8⁩ ⁨months⁩ 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?

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      • Cethin@lemmy.zip ⁨8⁩ ⁨months⁩ ago

        Freely means both directions, not just different speeds in one direction.

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      • nixfreak@sopuli.xyz ⁨8⁩ ⁨months⁩ ago

        lol everything is relative.

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      • ColeSloth@discuss.tchncs.de ⁨8⁩ ⁨months⁩ ago

        So, I can freely move through time if I consider alcohol as my time machine.

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• webghost0101@sopuli.xyz ⁨8⁩ ⁨months⁩ ago

  Do you have any idea how little that narrows things down?

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