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YouTubessa voit nauttia parhaista videoista ja musiikista, ladata alkuperäistä sisältöä ja jakaa kaiken ystäviesi, perheesi ja koko maailman kanssa.

This is probably my favorite Kurzgesagt video, and as usual, 99% of the science is way over my head. I must also admit that this is one of those rare series (hello podcasts, love ya, but…) that uses a professional narrator to communicate. 🥳

Anyway, I like this set of hypotheses for ~three reasons–

  1. The fundamental idea that the more massive a black hole is, the thinner it’s composite material, fascinates me. And that our own universe’s density of known matter matches very well against that idea. (our own universe, materially-speaking, is largely a soup of nothingness)

  2. Suddenly the ‘multi-verse’ idea of parallel universes (a beloved sci-fi notion) gains legs, but in an adjusted way-- that it ranges vertically so to speak, rather than horizontally. (and of course it could always be both, or neither!)

  3. Simply put-- hierarchy. We see hierarchy all across nature in the simple, direct sense of ‘there’s always something a little smaller, and always something a little larger.’ Or much smaller / larger. And that’s only in the dimension of physical size, of course.

Anyway, I’m quite sure we’ll never get to the bottom of this hypothesis before we asplode ourselves (as we’re already doing, thanks Billionaires!), but something about me really loves this idea.

  • jpreston2005BannedEnglish
    2·
    1 month ago

    The idea that in regular space, we have infinite time, and limited space… and then in a black hole, we have finite time, and limitless space is… doin me a confuse. Especially when they say you could walk in a direction and end up back where you started… like inside a black hole is like an inverted plane, or a planet in reverse… where I guess you’d be able to navigate time periods through physically moving yourself through them at will?

    And if time is just another dimension to travel in, maybe like a traditional X vs. Y graph for us, where Y is height… We, flightless humans, need assistance to travel upwards in the Y dimension… so I guess we could also need assistance inside a black hole to travel in the T for Time dimension… but there also would probably exist creatures, much like birds easily traversing the Y dimension on our regular space planet, that could easily maneuver through time… I guess with natural abilities akin to hollow bones but like… a form in which time didn’t have an impact? Like, functionally immortal things that don’t change with time, could more easily inhabit themselves in different times, because they don’t change? Like a tardigrade?

    So, could time travel be physically possible within our realm, but just for small functionally immortal beings? Could we transcribe RNA messages into tardigrades, and send them back in time to be read? Or would that change in RNA preclude them from being able to travel backwards?

    • SpacetimeMachineEnglish
      1·
      1 month ago

      Tardigrades are hardy but far from functionally immortal. And I don’t think anything in this shows that time travel could be possible within our universe. If it is possible inside a black hole it wouldn’t ever be able to affect anything outside the black hole anyway.

        • SpacetimeMachineEnglish
          1·
          1 month ago

          They can only last a long time while in a state of total stasis. If they are actually moving around they have a lifespan of a few weeks to a few years depending on the species. They’re hardy, but we’ve recently found bacteria in the lithosphere that seems to live for hundreds of years, going dormant for long periods until adequate conditions arise for them to get nutrients.