Physicist Reacts to TRUE Limits Of Humanity - The Final Border We Will Never Cross

[@zackwolf4625]

Coolest random facts video I’ve seen, great content!!!

[@DylanJDance]

kzbin.info/www/bejne/jH_aeqOnnJmmmrM

[@androgameplay1582]

@@DylanJDance lmao

[@fiszle]

Thank you for recommending all of these short stories throughout your videos. I've read/listened to them all and they have been fantastic.

[@DylanJDance]

That's so awesome to hear. I'll mention more :)

[@aninternetuser4306]

The universe is just so fascinating I love it

[@xuvial1391]

17:56 IMO, I don't think we have the incredible luck to exist in the "perfect moment" in time. If future civilizations will come to incorrect conclusions due to information being forever lost to them, then this may have already occurred in the past and we're also missing key information. What if we're coming to incorrect conclusions based on our limited observations today, and information that was only observable in the past is lost to us forever?

[@androth1502]

well sure. all the information beyond the initial singularity is lost to us forever.

[@alansmithee419]

@@androth1502 The point they're making is there may already be information from post-singularity that we're missing. And anything pre-singularity doesn't affect now anyway, so we wouldn't come to incorrect conclusions from not having it.

[@MakinWAVs]

i think the biggest difference here is that we know what our limits are. future citizens of milkdromeda won't even know to ponder

[@Ripa-Moramee]

Another good idea is that there is much we cannot see not that it has faded out of view, just as someone in the very far future would miss a lot as all you could detect and see is your local galaxy, then perhaps there is a lot we are already missing since the creation of the universe.

[@MatthijsvanDuin]

@@alansmithee419 Because we can still "see the big bang"... the light from the earliest moment you could hope to see anything (when the universe first turned transparent, about 380,000 years after the big bang) is still "visible" in every direction we look (albeit to sensitive instruments, not to the naked eye obviously), it's known as the Cosmic Microwave Background. This by extension means we still have the ability to view the entire history of the universe from that moment onwards.

[@AsmodeusDHare]

2:30 - yep you're right, it's 105,000 lightyears across... they probably thought it was 100k radius.

[@Phoenix-jd4yf]

This might have been your favorite vid of kurzgesagt, but this was my favorite video of yours, really interesting stuff you talked about. Keep the videos coming it teaches me new stuff and is entertaining

[@tuffjiggly8566]

"Sci-fi" technology allows for a thought process that goes outside of our current understanding of how we can advance technology in my opinion. For example, the computational and storage potential of datapads eventually led to us having tablets with essentially the same features. Now this doesn't necessarily mean all sci-fi tech will someday come into being, but it does allow us to speculate on how our descendents might utilize how the laws we currently think we know completely interact with those we've yet to understand.

[@Dwarfurious]

I was thinking sci fi tech like time travel; go back so far to when the universe was younger and THEN explore/colonize it.

[@adriancandelario2902]

@@Dwarfurious going back in time might be impossible because of some sort of paradox

[@brandoncammon7971]

Phones and submarines we're sci fi

[@KillerChickn]

Imagine being able to transform your body and consciousness into pure light, photons, and back at will. You could visit all points in space and time. Light doesn't experience time, but since the dawn of time it has gone everywhere. If you could become light, you could go anywhere at any time.

[@Trollnix2]

@@KillerChickn nope time is linear. You cant time travel because light is only the courier of perception.

[@jessieramirez8989]

I can literally sit and watch/listen to him for hours 🥰

[@IroAppe]

To the commenters: Do you know the video "TIMELAPSE OF THE FUTURE: A Journey to the End of Time (4K)" by melodysheep? I recommend to not watch it all too often, because I always felt very emotional going into the far future. Yes, it's one of those videos and I recommend to not watch it in the evening before you go to bed. Basically it speeds up time exponentially, and only after a few minutes, the universe as we know it is already gone. At that point all of us had that thought: "So what will be in the other 25 minutes of the video?" Well, they have extrapolated our CURRENT understanding of physics as far as it goes.

[@patricksporl8080]

If for some reason the universe stopps expanding, we could reach all of those galaxies even without FTL. It would just take a very very long time.

[@rithloveyou9737]

It won't stop

[@8thsheet407]

@@rithloveyou9737 "if"

[@izzycrybaby1164]

If the universe stops expanding, the Big Freeze timer would start immediately and we'd still have no time to learn all the secrets of our universe

[@JohnJohnsonSonOfJohn]

It would take so long to reach some galaxies even at light speed that they would no longer exist when you arrived

[@geetoasty]

And we might be able to live forever, if not super long times so it won't be too bad really, maybe even with time dilation

[@stephenmartinez1]

I just read the last question, after you mentioned it. and the ending was just, amazing and completely unexpected. The realization of what the AC had actually become. thank you for mentioning and suggesting it!

[@stevenevans6261]

you are proof that some people are smart and handsome. love your content

[@beowulf2772]

I think Kurzgesagt and Isaac Arthur both want to stay grounded (with our current understanding) and still stay optimistic. Both their channels explore how much the 6% of Universe we have currently can already be godly to us.

[@Raugharr]

I'm so glad I found your channel. As a fan of Kurzgesagt, not only do I get to re-experience their beautiful videos, I also get proof or correction of the things they mention. Never stop learning :) May I recommend Veritasium's videos for review as well? There are some mind boggling concepts those videos as well.

[@rahiljain8907]

The balanced audio really made a difference. Love your videos ❤

[@lucifersarmygaming7715]

our current understanding of physics isnt wrong its just a smaller piece to the bigger picture of how everything truly works. and its always evolving and adding new understandings. thats what science is pushing the boundaries of our current understanding and learning more about the universe we are in.

[@lichtenberglearning3801]

Great content, I enjoy your general lack of bias. Humility is rare and beautiful and this was full of great information

[@alansmithee419]

24:40 As a physics student, the most important thing I'm learning is not physics, but rather how to learn/discover more physics. I look forward to learning whatever it is we discover we've got wrong in the future. Being wrong is annoying, but discovering you're wrong is incredible because it could be a bridge to learning so much more.

[@Xenon_001]

"Being wrong is annoying" Unfortunately that's where 99% of society lies, adamantly believing and following the biggest lie that currently exists today: evolution.

[@-stefanv-5439]

The fact that science still has to solve many many things actually makes it more interesting. Because when everything is solved there is no possibility to dream anymore. There would be no "what if we could do that one day", because someone would have a definitive answer for everything... Also the scientific progress is kinda defined by the more we uncover the more we don't know (or phrased differently we find out, continuously, how stupid we were before). At the beginning there was just our planet and the night sky with a few lights, now we know there is a universe unimaginable huge and trillions of times larger (and smaller than we ever thought), with lots of unexplained stuff in it.

[@triplex5651]

My favorite kurzgesagt video is the loneliness one. It may not be about physics, but it's relatable and inspiring to learn more about how loneliness works and the history of it also.

[@powderedphantom5765]

4:52 Well (assuming the speed of light is the same in all directions) the galaxies already collided millions of years ago

[@Ninjxxitty]

light travels distance instantly because of its acceleration. it goes from 0%-100% speed literally and its momentum is maxed out as well.

[@XRedDemon27]

Love ya man. We ARE hallucinating reality. Your mind does amazing things to bring you your perception.

[@ScoobyYTP]

What if the universe is older than we think?

[@salambekmajrbekov348]

The chadiest of the physicists released a new video, my day is complete 😎

[@thomasjohnson3544]

"Let there be light" The Last Question is beautiful

[@mazuzuri]

Couldn’t help but think of hyperdrive from star wars and stargate when you mentioned other dimensions

[@KingOfGamesss]

24:10 The CORRECT saying is: "Ignorance is TEMPORARY bliss"

[@SirRobertSpriggs]

I love your tangents at the end of the video. I think about that stuff very often!

[@lukat.djukic9760]

Man... As science don't know it's limits, YOU don't know how good are your videos! :)

[@Matyanson]

Sorry to write this under every video, I just don't know if you have read my comments. I just wanted to say that I highly recommend the channel "ScienceClic English". I love how they can explain complicated topics clearly by intuition without compromising on accuracy while still being captivating. Every bit is nicely spaced out to give the audience time to process, and no information is extra. I find all of their videos amazing, but if I had to pick one, it would be "What is General Relativity?". They also made an explanation + visualization of Falling into the black hole, I'd say more accurate than Kurzgesagt and I learned more from it. I love both Kurzgesagt and ScienceClic English. I think Kurzgesagt is more on the entertainment side while ScienceClic is more on the rigor, educational side. But you learn super interesting things from both of them!

[@dalhaan]

ScienceClic is such a good channel. Would love to see a reaction to their videos. Especially the general relativity, quantum field theory or what are forces videos.

[@tidedetergentyummy]

why do you look like Matpat who actually studied and finished physics instead of theatre and psychology.

[@CausticSalsa]

Alright this video is giving me a bit of an existential crisis and anxiety so I'm gonna hop off for now but it's a wonderful video and I'll most likely come back to finish it later.

[@marleythedogge1839]

I almost geared up as well that was indeed beautiful

[@ahmadshakaib1311]

I love watching your videos. Your encouragement of questioning our current understanding of the universe is refreshing. Too many people go through life with certainties especially related to our world.

[@dannyguitardrums]

Thank you for these videos so much information I didn’t know

[@Sen-ki-]

2:36 No you don't need to update, you're right. 100 000 light years in radius and 200 000 light years in diameter. They were talking in diameter, you probably were talking about the radius.

[@beowulf2772]

I hope Kurzgesagt will make a video about the last question, just like with the syory of the egg

[@Aoitori365]

yeah like for example warp drive in star trek expands and contracts space in a bubble around the ship to go faster than light without actually moving faster than light

[@IroAppe]

It is a testament to how well you did it, that I always forgot to write this: The sound is super, i'd even call it perfect. I can hear both you and the kurzgesagt video well, and can even decide who I want to listen to. And after the pauses, the volume is still at the same level. Also, have you updated your microphone? I think the sound quality of you talking sounds great too!

[@sock2828]

Thank you for pointing out that we don't actually know a bunch of stuff for sure. I've seen people, who should know better, seriously claim that we basically fully understand gravity because of how accurate general relativity is. Which is kinda a silly claim to make when you consider that we've been trying to reconcile GR with quantum mechanics for like 90 years.

[@michaelwerkov3438]

"Reconcile these nuts" -einstein, probably

[@Minalkra]

Hope we have a Gellar field before trying to pop into any of those bridge dimensions ...

[@kobil316SH]

The way the futurama ship moves can do it

[@androth1502]

the people who evolve on a planet in the final galaxy may theorize that at one time there were many galaxies as they watch their own galaxy slowly wink out, one light at a time. the people who evolve around the last star will probably have no idea whatsoever.

[@MrMrMadMax92]

If there are more great minds like you, i see a bright future for humanity

[@hulkamaanio]

I just listened the last question from isaac asimov mid this video :D and OMG its so good! :D

[@chloekaftan]

finally you are starting to understand why so many people watch kurzgesagt! his videos are a spiraling rollercoaster between hopefulness and existential dread! xD

[@edwinamador5147]

You Know What let's talk about everything in the universe "later on"

[@Nopejams]

This dude talking about going into the warp then out of it…HERESY!

[@Kafrin588]

kurzgesagt actually has a wormhole video, you should check it out!

[@PaulADAigle]

Theories: 1. Black holes are E-R bridges to other universes. Our Big Bang is actually a White Hole side of another universe's Black Hole. 2. Dark Matter/Energy is the result of parallel universe gravity leaking through. I'm not sure how we could do any scientific tests to check #1, but mapping the extraneous gravity effects might be a way to check #2. Personally, I believe parallel universes are actually an aspect of adjusted time from our own space-time. Basically a mirror of our own, but somehow split by happenstance.

[@izzycrybaby1164]

Aliens somewhere right now: "Ha, get a load of these idiots. Still thinking the universe is flat, eh?!"

[@notcallum9899]

go on lad

[@rots3123]

Please react to "The Egg" visualization of kurzgesagt. Thanks

[@Nikioko]

The best proof for a finite universe is Olbers' Paradox. If the universe was infinite big and infinite old, the night sky would be bright because at every position there would be a star.

[@Xenko007]

Just subscribed On My personal Email for your news letter I don't have wifi all the time so hopefully when I check it out I get to see some Cool News 🔥

[@lubomirkubasdQw4w9WgXcQ]

interesting how the big rip will occur in about 22 Billion years. we really do not have much time

[@lubomirkubasdQw4w9WgXcQ]

(not featured in the video, i'm just typing that because it's interesting, and it kind of matches the topic)

[@mainaccount0007]

Why is Die Walkure, Act III playing in the background at the start lol. Interesting song choice, thought I was the only one who liked classical music.

[@ivanskorica6979]

24:52 Oh no. No no no no. I don't need this kind of bug in my head xD xD xD

[@philwallace6381]

wow i'm so glad you mentioned Isaac Asimov! He's my favorite author, fiction or non fiction, i've read most of them

[@DerSenat]

i highly recommend getting an addblocker.

[@Rosefallen]

Near the end when you mentioned Wormholes being a fold in space, I instantly had a revelation because of a book that I had read in the 5th grade called A Wrinkle in Time. They explain that in order to travel instantly throughout the universe they had to fold space on itself in order to put themselves in two places at once. With your explanation now I realize that it’s folding dimensions, which I believe could mean that you make a pseudo-fourth dimension temporarily to exist within two places at once and choose which one you stay in. If I am incorrect, please correct me

[@Rosefallen]

@PaperMan thanks! I didn’t know this

[@apaarsharma8143]

We might be able to go billions and billions of light years away through worm holes if they exist...They might even be in black holes which would mean there are many...All theoretical but possible Edit - He talks about this in video and I posted it before watching it

[@SkyLordPanglot]

12:20 hell I never realized that. All we see with the naked eye are close stars and they are not dead. The only ones that are long gone are stars looked through powerful telescopes or orbiting telescopes. I know you said that, but Im repeating it just so it can sink in. I really believed this misconception. Never occurred to me that really the naked eye sees just a tiny closer portion.

[@volsalacky]

In 400 years, modern theories will look as 400 years old (with stars nailed to the sky sphere). People will smile, as we do today.

[@St.leoMAGNVS]

You should make a channel just talking about the concepts that you bring up in these videos 🐇

[@midgetwars1]

Blows my mind that future people/aliens would actually know LESS than what we do now about the universe. That is, if we ignore sci-fi cos time travel

[@beowulf2772]

I think 200k Ly is the new estimate for the milky way from 100k to 160k to now it might be 200k

[@michaelwerkov3438]

Do we know any galaxies or stars that were visible one year but then started to or did disappear years later, as if they were on the cusp?

[@trevorcornell6729]

Wait if things like matter during the big bang then is it possiable for us to make something to replicate that? Or maybe even make a machine that could move fast enough to catch up to galaxies?

[@benmcelwain5301]

How is it that a photon can undergo change, red shift stretching, without it experiencing time?

[@michaelwerkov3438]

DYLAN... i love kurgestwazadgt ... but totally you should react to isaac arthur... especially his old interstellar and interplanetary war videos

[@Pseudo___]

Hope you support Kurt’z channel, you dont even play his support his channel message. You dont say to support his channel …

[@tommybronze3451]

wait wait wait, they stated "allowing sci-fi technology" - that includes FTL, which technically allows to move past the horizon ?!

[@vit.budina]

Just a creative thought, very much unrelated to the theme of the video, but fun to think about nonetheless. I've heard opinions that we cannot be certain that the speed of light is the same in all directions. So I came up with a small thought experiment: If we entangled two particles through quantum entanglement (which I'm not sure I understand correctly, so feel free to correct me), use them to communicate with an atomic clock on the Moon, Mars, or any other distant point in space, and then measure the speed of light in the direction towards that atomic clock, and subsequently measured its speed back to Earth. If light speed is different in different directions, it could be dependent on the direction from the universe's "origin", aka the centre of its expansion. We could then use that knowledge to calculate where the centre of the universe is, which, in turn, would enable us to estimate the minimum "radius" of the universe at the furthest point we can see today. I'm not sure if we can assume that the universe is spherical or any other centrally symmetrical shape, I know my comment is full of assumptions and likely overflowing with mistakes and factual errors, but I'd like to hear an astrophysicist's opinion on this thought.

[@rykehuss3435]

15:08 Surprised you didnt catch this one even though you were just previously talking about how the photon experiences no time. It would take 11 million years for people not on that space ship. But for the people on it would take 0 time. Yet in the graphics theyre showing multiple generations passing. Lightspeed travel is a teleport, just that the rest of the universe pays the "time tax" on the trip. Of course there's also the downside that once you hit c, you can never stop again since you are experiencing 0 time and 0 distance so you are essentially permanently frozen until your ship hits something and explodes or the universe has expanded enough to destroy you and your ship on an atomic level. For you it would not take any time. A proverbial blink of an eye and you would not exist anymore.

[@nzv300]

Next video "what if you were made of light? " by science asylum?

[@EduardoSanchez-un2hh]

You could use the Brave Browser so ads don't interrupt the video.

[@Knightmage_elf]

on the limits set for us by the video and everyone else: "that can't happen because it doesn't make sense!" Since when does the universe need your understanding to do something? The reverse is true too. Who says humanity can't do something in the future just because it makes no sense to us now?

[@DaveR187]

At some point in time I'm sure we can use the electromagnetic force to bend space easier than gravity, allowing us to shape and move space to our liking, no speed limit would apply to us, given we control enough energy.

[@Silver_Sage663]

Imagine if future humans created a version of TARDIS. Boom done. No limits.

[@aaronmicalowe]

I suspect that we will overcome all known limitations, because our currently understanding is like one pixel of one frame at the beginning of the movie, and we think we already know the plot!? 🤔 No way. We literally know nothing relative to everything there is to know and every new discovery potentially rewrites the whole rulebook.

[@TheBadassTonberry]

The english Wikipedia doesn't say much, but the German one says the Milkyway is 170,000 - 200 ,00 ly in diameter. So he probably got it from there. NASA says 100,000 though. But SpaceDotCom (don't want this comment deleted) claims a new study suggests 200,000. So take your pick, I suppose.

[@neb-taui-djeser1060]

25:03 Nice, our real final border, consciousness. From my perspective everything starts and ends with my consciousness. No way to confirm or experience yours.

[@burns4246]

requesting that you react to some of issac arthur futurism videos

[@kishi7385]

How is it possible that things are moving away from us faster than the speed of light? That's impossible, anything relative to something can't go faster than the speed of light. Anything that has a mass of 0 or greater anyways.

[@darenmiller2218]

Also, I kinda feel good knowing we don’t know exactly what’s going on. If we did, there’s nothing left to figure out lol.

[@the_Periador]

I love watching your videos mate! You give some good perspective and insight! Just one thing, if its possible ofcourse, you are definitley a good looking man but i think it would be nicer if youd make your camview a little smaller, just a smidge. You seem to be getting more comfortable each video which is great! Keep it up mate!

[@noisemagician]

Could you make a video talking about the limits of our current understanding, talking about fringe theories that might be right?

[@thermalrain_yt9725]

I know it's lazy but can you put a link to the email list for your article. I would've signed up already but I'm on my phone and am too lazy to write it all out and search for it. I know I'm not the only one

[@johnnyd1790]

I think he meant SF tech in the manner of traveling through space, that's it. Other more wild or exotic type of SF tech is just unfathomable, so out of question for this video.

[@IroAppe]

7:56: That surprises me too, since I am in my mid-20s (40 years out of date wow) and still only have learned this order, where inflation came after the universe began. Are there resources where I can learn about how it really is, or can you maybe talk about it some time?

[@VojtěchJavora]

The problem is how you define the big bang. There is no consensus for that.

[@marcuswirick6896]

Shouldn’t we say “A” Big Bang instead of “THE” big bang since we think there was multiple big bangs

[@Nick-pd2yo]

If we had more senses than we do we would understand so much more. Between visible light and hearing and touch we are experiencing fractions of reality. You mentioned our galaxy or universe was flat. Does the same ring true for other groups. Do they curve or are they flat at a different angle? If they are flat then does the notion of higher ‘dimensions’ actually mean that parallel universes are true as well because they occupy the same ‘shelf’ in space and time?

[@totallylegit4092]

My personal opinion…we cant even directly detect the majority of the stuff in the visible universe. It would be arrogant in the utmost to think that we have a complete and accurate understanding of physics. Hell, I personally think that one of our biggest problems with understanding the universe is that we use math…and I am not sure math is the ultimate expression of the universe.

[@jerryberbss4578]

would like to hear your thougths on the break through in nuclear fusion

[@Nikioko]

Space-the final frontier…

[@unslaadkrosis9435]

Kurzgesagt gives you the strongest existential crises and then tries to end the videos motivationally. It's like chopping off someones arm and trying to heal it with a bandaid 😂 I love them

[@oddicocidic]

wouldn't it only take seconds, on the ships clock, to move light years away, if one moves around the speed of light?

[@chri-k]

No, not seconds. ( if i understood correctly ) _at_ the speed of light movement appears instantaneous. This presents a problem because you have literally zero time to decelerate, and you will obliterate whatever it is that you were trying to land on.

[@mrmurph9387]

Hello sir, When you said photons don't experience time but if their original trajectory is altered by gravity changes the trajectory won't they take longer to reach their enevetable destination?