The Edge of an Infinite Universe

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  • Published: 03 April 2019
  • Have you ever asked “what is beyond the edge of the universe?” And have you ever been told that an infinite universe that has no edge? You were told wrong. In a sense. We can define a boundary to an infinite universe, at least mathematically. And it turns out that boundary may be as real or even more real than the universe it contains.

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    Our universe may be infinite. In order to wrap our puny human minds around such a notion we like to come up with boundaries. For example we have the “observable universe” – that patch that we can see, and beyond which light has not yet had time to reach us. It’s boundary is called the particle horizon. Beyond it there exists at a minimum of thousands and possibly infinitely more regions just as large. Our observable universe is like a tiny patch of land in a vast plain. We define its horizon like we might build a little picket fence around our little patch – meaningless from the point of view of the plain, but it makes our patch feel more homey and us less crushingly insignificant.

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Comments • 3 842

  • Wizbro
    Wizbro  2 hours back

    I wish they had a different presenter.

    • Steve Lenores
      Steve Lenores  17 hours back

      Boundaries are a human requirement. The universe is under no obligation to comply. There simply are always going to be mysteries beyond our understanding. Yet speculating on them keep mathematicians and physicists employed.

      • DR WOOTANGYEH
        DR WOOTANGYEH  22 hours back

        The seven heavens are the space dimensions that are attempted to be so confusingly explained here, the question should be what is is the space between the dimensions and all around

        • Ellis K
          Ellis K  1 days back

          Get this clown off my youtube.

          • Michael Lochlann
            Michael Lochlann  1 days back

            I used to think I was smart and then I watched this video.

            • stackfl0w
              stackfl0w  1 days back

              aids space, got it lol

              • SMS
                SMS  3 days back

                This is wild

                • Wilhelm Von Wilsenheim

                  Mankind's unwillingness to come to terms with something undefinable is astounding. Why do we even need to find an edge to the universe? I doubt the sanity of these physicists, for they must have been inspired by science fiction and comics.

                  • Topsy Turvy
                    Topsy Turvy  5 days back

                    SHOW ME OUT! I WANT TO GET OUT OF IT 😆 !!!

                    • Anand Swami
                      Anand Swami  5 days back

                      Each universe has hyperbolic biverse combination wirh mathematical equation X^2 - Y^2=A^2 with lim. A¬0

                      • Gavin Rowley
                        Gavin Rowley  5 days back

                        aaahh. There's a Hawking radiation episode. I love this channel. I was just wondering how that defies everything summed up about black holes.

                        • The Alpaca Redstoner
                          The Alpaca Redstoner  6 days back

                          What if the ads spacetime is subspace?

                          • Michael Te Miha
                            Michael Te Miha  6 days back

                            You are having a fat guess

                            • TheSeaBast
                              TheSeaBast  6 days back

                              Woah, this seems a lot like Indra's net

                              • Bob Taradão
                                Bob Taradão  6 days back

                                Just because you can represent something matematically does not mean that it exists in nature. To say there are boundaries in a infinite universe makes no sense to me.

                                • Silent Psykosis
                                  Silent Psykosis  7 days back

                                  All these complicated theories just to try and argue against a paradox... Something which is infinite, by definition, cannot have an edge. There's a difference between indefinite and infinite even if our perception of both may be the same. People once upon a time looked out at the ocean in the same way.

                                  Besides, we can never really know if our universe is even infinite, to begin with. It's just thought to expand indefinitely and physicists call it infinite >.>

                                  • Michael Jetnikoff
                                    Michael Jetnikoff  1 weeks back

                                    Hi,the 8 breathes,hearthbreath,light curves higher dens,high refractive index,this uan1verse verse one verse in song of GOD GENSYS ORIGINUM DAYSIGNER,GENERAL GRAV CIRCLULARIZARTION,O,DUE TO DAYNAMARISM DUALITHRUM OF DENS,DIFFUSION,OR FISSION,DUSION,EINSTEIN WAS WARNED,NOT LET CRAZIES KNOW SO BURIED IN CURIOSNAUSS CAUNCENCE,FISSION,FUSION,DFUSN,DENSITHRUMBRESTH,ST/G OF THIS uan1verse,finit`as is sub fn of true infinit` thru 7 dgre freedom ,surface rel Pi (d/2)^3,vol fn D/2)^3,thus “E prop to area seen observer but not dep on being observed as dfrnt with,dfrnt perspactive,surface curved rhomboidal multumpla,as a 2d,(x^2),3D (x^3),sub function of true infinit,not reached if auxpansion,then not infinit,if smaller than << true infinit~,say this be (01*)^7,d,subfunction finit`,please caunsider,this true whether thee live or not ,thanx,bliss,XAMichael

                                    • BobsYourUncle5000
                                      BobsYourUncle5000  1 weeks back

                                      Brain asplode.

                                      • Dan Stewart
                                        Dan Stewart  1 weeks back

                                        I wonder who this guy thinks his audience is?

                                        • Dan Stewart
                                          Dan Stewart  1 weeks back

                                          Why does this guy characterize our existence as *_"crushingly"_* insignificant"? Is his ego so big that he must somehow feel important in the face of the entire universe? How about just grow up -- you're only important to your mommy.

                                          • Soumyabrata hazra
                                            Soumyabrata hazra  1 weeks back

                                            Why people are doing so much funny comments in such good videos , I can't hold my laugh 😂😂😂😂😂

                                            • In peace Alone
                                              In peace Alone  1 weeks back

                                              This guy is so much better of a host than the original/angry/overly egotisticaly serious host. That guy was annoying garbage, this guy is happy and much better than the other guy

                                              • UFOlogyPRSS
                                                UFOlogyPRSS  1 weeks back

                                                Our past paradigm of analysis and conjecture through mathematical models seems contrary to the notion of how it works, which is experiential by design and backing into the appropriate model configuration. We continue to project our ideas upon something that has its own construct instead of observing how it works, not what it looks like, which is at least a slightly different perspective.


                                                Equations and postulates are certainly part of developing understanding. It is the direction of that process that falls into question, imho. Why would you want to define boundaries on something that is limitless? That just seems counter-intuitive.


                                                I'm really unclear and a bit under-qualified to assert, though I think it is a reasonable assertion, that modern models move beyond last century's models based on limited thinking. Sure the thinking was far beyond most of us, though models like the Trans-Dimensional Distinction Vorticular Paradigm need more attention.


                                                I could be wrong, but the idea of consciousness was not included in any of last century's models. Any equations, imho, are remiss if the consideration is not considered. Consciousness, space and time are indeed tethered beyond our current level of comprehension, let alone inclusion in our consideration of activity toward sustainability.

                                                • Sorlell Luke
                                                  Sorlell Luke  2 weeks back

                                                  God 21st century battalion I

                                                  • Hans de Ruiter
                                                    Hans de Ruiter  2 weeks back

                                                    You talk about the edge, How about time? The further we observe space the more we can we see into the past. Light emitted x millions years ago. If we keep going further in theory we can see the state of the universe after the big bang. So is there an edge of the observable space?

                                                    • Brian Dennington
                                                      Brian Dennington  2 weeks back

                                                      Got any flat earth theories?

                                                      • xFallenRagex
                                                        xFallenRagex  2 weeks back

                                                        Am i the only one that noticed the door chime from STNG when the hyperbolic surface popped up at 10:42?

                                                        • Andy Miron
                                                          Andy Miron  2 weeks back

                                                          Damn.. You scare me...

                                                          • Andy Miron
                                                            Andy Miron  2 weeks back

                                                            Minoeons reply: Banananananananananana BanAman... :D

                                                            • Andy Miron
                                                              Andy Miron  2 weeks back

                                                              You broke my Brain dude!!!!!

                                                              • Thinking Ronin
                                                                Thinking Ronin  2 weeks back

                                                                I go back and forth between these PBS Spacetime videos and videos of drunk people falling down. What does that say about me?

                                                                • NSW Despatch
                                                                  NSW Despatch  2 weeks back

                                                                  i just sitting here and pretended i understand every that he said...so what is the out come????

                                                                  • RandomName Last Name
                                                                    RandomName Last Name  2 weeks back

                                                                    How long would the people-sized phase of the big rip last?

                                                                    • Low Huey Ing
                                                                      Low Huey Ing  2 weeks back

                                                                      i dont always get the content on first play, but his voice is so soothing, i could just 'listenonrepeat' and subconsciously building the schema while i work . So when i rewatch it with full attention, it helps to understand the topic better.

                                                                      • Gagan Ghansela
                                                                        Gagan Ghansela  2 weeks back

                                                                        He's speaking the language of GODs

                                                                        • Gagan Ghansela
                                                                          Gagan Ghansela  2 weeks back

                                                                          time to sleep ...

                                                                          • G H
                                                                            G H  2 weeks back

                                                                            Well, duh

                                                                            • ruatsanga white
                                                                              ruatsanga white  2 weeks back

                                                                              Universe is flat
                                                                              Flat Earthers: breathing intensifies

                                                                            • 21 TRUTH IS NOW! ALL IS NOW!!

                                                                              And yes we do indeed live in flat space , sorte in the middle of an 8, its all electromagnetic and there are 2 different sides to the living aread in the center of the 8 the 2 true poles are located on each their side of it.... dont fear outer space its all inner space, other lands are here in the outer rings and inner, its like the tree of life, exactly like a tree, the tree makes more rings every circle of its life, new ring in our world means new lands and new beings, there are already older lands and kinds and there are also new lands and newer kinds of beings, all inside our flat expanding plane with its 2 opposite poles and side to X-plore / X-it :) Remember what ET's means, they are just the extra living being in the extra lands, the other lands are whats actually called space....

                                                                              • selfless
                                                                                selfless  2 weeks back

                                                                                * watching the video with my morning coffee *
                                                                                me: damn, i'm gonna need a much stronger coffee than this. probably some LSD as well.

                                                                                • Augustus Sinclair
                                                                                  Augustus Sinclair  2 weeks back

                                                                                  Hmmm. Now do the video again, but for dummies.

                                                                                  • DRUNKEN RAMBLE
                                                                                    DRUNKEN RAMBLE  2 weeks back

                                                                                    This channel makes "How The Universe Works" look like Barney's Sing-A-Long.

                                                                                    • Larry Walsh
                                                                                      Larry Walsh  2 weeks back

                                                                                      ........ I think I'm gonna need to watch this more than once......

                                                                                      • Vytautas Grašys
                                                                                        Vytautas Grašys  2 weeks back

                                                                                        i feel like my brain is going to melt

                                                                                        • Michal Vlček
                                                                                          Michal Vlček  2 weeks back

                                                                                          I think our universe has some boundaries and is finite, but these boundaries are inimitable because of the expansion of the universe.
                                                                                          Many contexts point out that the theory of superstring or theories supported on the same basis can be true.

                                                                                          • bop god
                                                                                            bop god  3 weeks back

                                                                                            I'm so lost bruh, my brain keeps losing focus everytime he says something slightly complex

                                                                                            • I Hate Ads
                                                                                              I Hate Ads  3 weeks back

                                                                                              If the universe is infinite, shouldnt it technically have an infinite amount of chocolate in it? So doesnt that mean that the entire infinite universe should be completely filled with an infinite amount of everything???

                                                                                              • V. E.
                                                                                                V. E.  3 weeks back

                                                                                                OK, perhaps a bit too "heavy" right now. smh