Neil deGrasse Tyson Explains Time Dilation 

Well, either that or your language skills aren't very good.

You call that explaining it simply? I mean granted he broke it down pretty good anyone here watching this I think is a niche audience and is probably able understand it a bit better tho. But I'd say even this breakdown is far from simple for everyday folk.

@@satisfiedcustomer yes and no. it is for a specific audience but he broke it down in simple terms RELATIVE to that audience. you could even say to anybody with his particle accelerator example that the faster u go approaching the speed of light the slower your time is relative to others

Time is LOCAL.

That was explained very poorly.

Its really crazy how much stuff he predicted so long before it could be physically proven

It's actually easy. If you use the Pythagorean theorem and compare two reference frames, and then allow the speed of light to be constant, you get time dilation. Einstein didn't even invent this, but Fitzgerald and Lorentz did. What Einstein did was to have the courage to see how this could affect everything - nobody wanted to go there or think about the implications. In fact, they used all their energy to come up with some alternative explanation that did not seem so insane.

cough isaac newton cough

Maybe today he would just be playing videogames...

It helped a lot that he wasn’t scrolling through RU-vid comment threads. What? Oh! Oops!

There is no real "dumb" person actually. There is no smart or smarter imo. Personally i think we all live in our own world and we try to express that with own views.

​@@semiramisubw4864 LMAO

@@semiramisubw4864uhhh ok… get em son

I think both Neil and Chuck together....

Oh and btw its alr been proven that people can be genetically smarter than others and you can also inherit the intelligence from say for example your dad.

I would’ve probably graduated

I would then believe there are 500 genders.

Why is that ? @@porterwake3898

All the people who made it in life, became their own Neil to teach themselves. All the losers like you blamed not having a good teacher.

One major problem is, teachers that WOULD be like NDT can’t be like him because their class sizes are too big for individual attention as kids need, as well as overwhelmed with the amount of work and not enough resources. 😢

The closer to the speed of light an object moves, the slower it appears to be moving through time (aging) to outside observers... and the faster the outside observers seem to be moving through time (aging) to that object. Another way to look at this, if you looked through the window of a spaceship moving near the speed of light, the outside universe would seem to be moving on fast-forward like a VCR. And if outside observers through a telescope peered into the window of that space ship, you would appear to moving in slow motion. Now light (photons) move AT the speed of light, so to outside observers photons are frozen in time. They don't age, they are the same age the moment they were created as when they have traveled 1 billion light years. And from the photons' perspective, the universe moves through time at infinite speed, so in the instant the photon is created and then destroyed, the universe ages instantly. A photon created shortly after the Big Bang and flung into deep space experiences the birth and death of the Universe in the same instant. Basically, photons are outside of time, time doesn't seem to apply to them in any meaningful way.

whats about the heartbeats? Does that remains same?

@@sleepwith4098 From the perspective of outside observers the heart would beat in slow motion, the heart beats of outside observers would seem faster.

Great!!! It's not just me. I start off paying close attention to every word and detail. About 4 minutes in and I'm lost.

Okay, I've heard that explanation umteen tumes before. Still no aha moment.

I think he is smart so that must mean I am not part of all of us! 🤔

He’s annoying and ruins the videos

Deadass … he is keeping up with the convo meanwhile idk wtf they even talking about i keep having to rewind it lol

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1BCkSYQ0NRQ.html

Chuck's a beast

so someone x light years away will see us and someone 2x light years away would see our ancestors this is amazing to think about light emitted preserves our image throughout space n time

u dont even need a hypothetical world moving faster than us u just need them to be at a greater distance

@@chunkyboi4526🤯🤯🤯

more mind blowing facts: Let's consider the hypothetical journey to the Alpha Centauri star system, which is located 4.3 light-years away from Earth. If time is measured in years and distances in light-years, then the unit acceleration (a) = 1 light-year/year², is close to the acceleration due to gravity and approximately equals to 9.5 m/s². Let's assume that the spacecraft accelerates with unit acceleration for half of the journey and decelerates with the same acceleration for the second half. Then the spacecraft turns around and repeats the acceleration and deceleration stages. In this scenario, the flight time in the Earth's reference frame will be approximately 12 years, while on board the ship, it will be 7.3 years according to the ship's clocks. The maximum velocity of the ship will reach 0.95 of the speed of light. In 40 years of proper time, such a spacecraft will reach the center of the Galaxy, and in 59 years of proper time, a spacecraft with unit acceleration potentially can make a journey (returning to Earth) to the Andromeda galaxy, which is 2.5 million light-years away. On Earth, during the duration of this flight, approximately 5 million years will pass. By developing twice the acceleration (which a trained person can adapt to under certain conditions and with the use of certain adaptations, such as hibernation), one can even consider an expedition to the visible edge of the Universe (approximately 14 billion light-years), which would take astronauts about 50 years. However, upon returning from such an expedition (28 billion years according to Earth's clocks), the participants risk not finding alive not only Earth and the Sun but even our Galaxy. Based on these calculations, in order for astronauts to avoid future shock upon returning to Earth, a reasonable radius of accessibility for interstellar expeditions with a return should not exceed a few tens of light-years unless, of course, fundamentally new physical principles of space-time travel are discovered. However, the discovery of numerous exoplanets gives reason to believe that planetary systems are found around a sufficiently large fraction of stars, so astronauts will have plenty to explore within this radius (for example, the planetary systems of Epsilon Eridani and Gliese 581).

One point in this film interests me. It is known that when approaching a black hole, time slows down (for an external observer), but when crossing the event horizon, time stops altogether (for an external observer). The question is: how was the main character able to cross the horizon of events? After all, for any external observers this moment will happen in the infinitely distant future. That is, when it crosses the event horizon, by this time an infinitely large amount of time will have passed outside the black hole, and the universe surrounding the black hole will have long since perished.

@@NamemaNSl so, you're not bothered by the fact that after crossing the event horizon he sees the freakin bookshelves in his daughter's room, but you're bothered by the lack of sufficient time dilation for an external observer?

@@NamemaNSl I'd say this is where the "Fiction" part of Science-fiction comes in...

@@IamGroot786 In fact, this question interests me even without reference to the film. How can black holes grow if the lifetime of the universe is not enough for anything to cross the event horizon? It seems that it is believed that the event horizon still intersects in a relatively short period of time from the point of view of an external observer, but I have never seen an explanation for this.

Learning is actually really cool.

@@StarTalk yeah it is, my 6 year old daughter is learning that everyday:)

You know Chuck meant business with the fewer than average quips in between.

Yes. I was thinking the same. Chuck loves the subject as much as us watching and does a brilliant job of translating (as you said) and saying the genuine "wows" as we are. 👍

I really enjoyed this. He's genuinely intrigued, as am I.

large ?

@@geog26 you know what he meant.

Only those that don't hit a telescope are extremely large hence relativity

Yah well 9.5 trillion kilometers. Extremely large. Wanna know what's even larger? A 105,700 lightyears. That's the diametre of our galaxy, The Milky Way. So theoretically speaking, a photon born at one point on the edge of our galaxy would take 105,700 years to reach the opposite point, while travelling 9.5 trillion kilometres/5.9 trillion miles per year. Gives you a headache just trying to fathom the vast expanse of just our own galaxy doesn't it? We're nothing in front of it. Then there are 200 billion galaxies and that too is limited to the spectrum of what we call the observable universe.

I didn't understand the correlation there between Photon not experiencing time and then light year becoming extremely large. Hypothetically a spaceship is travelling at the speed of light from our perspective we can see its travel albeit very fast but still observable for us.. but from the perspective of traveler in the spaceship he would not experience the travel itself and from Point A to Point B as soon as he starts he would reach his destination and time would not pass from him between the two points so basically for him he teleported there maybe would not have aged in his travel but for us we saw him moving from Point A to Point B that's what I understood here.

Agree!

But thought time slows down the faster you go

©€€° J™udah D™avid ®€€°

On other topics, Neil DeGrass Tyson is a scientific sellout and should not be taken seriously. He has lied on several counts and pushed SCIENTISM (the abuse of science for the sake of pushing a narrative) for his own political gain in certain arenas. Buyer beware.

Thats like not being able to count and hiring someone else to do your books. How would you know if you are not being cheated out of money? You won't because you can't count. Taking something at face value is just the same.

...absolutely - couldn't agree more. He's become such a well educated dude.

Calm down. Intelligent people exist, don't be surprised and threatened by them.

Chuck always impresses me

His "live fast die young" was perfect. 😂

If you spend ** hours with Neil you should just get one …

Wait until you hear about Feynman's work. It's perfectly possible for subatomic particles to travel back in time. Happens all the time in fact.

Sounds/seems almost spiritual in nature

@@Y_M1967 From a spiritual perspective, it would seem this description of travel from the photon's perspective (timelessness) seems like the closest scientifically observable thing we can compare to the nature of God. I mean if all the photons in the universe collectively travel throughout the universe instantly (at least from their own perspective) then they are basically omnipresent which has always been one of the key attributes of God.

@@skyhawk_4526 omnipresence was not always attributed to god(s). Even within christianity: according to the bible, god only knew that Adam and Eve ate the fruit when he saw that they were covered. Also, humans are sentient, and god has always been attributed sentience. This, among other attributes of god shared with humans, means that we're the closest thing to gods (which makes sense, considering we made it up).

How did the explanation of the travel of a photon turn into commentary about spirituality and god? That makes no sense to me. People's opinions about spirituality and implying them in science boggles my mind

Apparently it has a pretty short life span once it stops woving fast enough to freeze in time, hence turning out a light in a room and it going dark right away. A photon is literally an instant frozen in time, never succumbing to its extremely short lifespan

then how come the light from a star goes out or it dies and turns into a super nova?

@@cocolove9916 that’s because the star runs out of fuel

@@aaronmiranda1312 is there a reason behind why ?

if the photon does not age then how come it stretches?

Yeah it's completely counterintuitive.

Sounds like something a lot of kooks talk about in a psych ward.

It's actually impossible to understand. The faster you try to understand it, the slower your mind travels until it stops completely.

@@valueofnothing2487 haha!

@JFQ uhmm not really

How long can a can phone reach

@@ericparrish1515 Their maximum range was very limited, but hundreds of technical innovations (resulting in about 300 patents) increased their range to approximately 0.5 miles (800 m), or more under ideal conditions.

Chuck is kinda annoying tbh

Doesnt look too eternal when i hit the light switch and the room goes dark lol

"Light is eternal" Blackhole/dark spots on the universe: "Are you sure about that?"

Same realization lol

Lets say I have the whole universe in a snowball and I am some giant being observing. One person in the snowball is wizzing around at the speed of light, the other is stood still. Both have watches on, then the one who was wizzing around stops. Why would their watches then be different? Because it moved? Does not make sense to me and I'm trying.

@@mattball420 We dont know if light disappears when they get soaked in actually. It could actually live on.

@@StellarFacts12 ok buddy

@@StellarFacts12 ok😭lmaoooo

Yea 😐in fact think about it what do you remember before you were born you don’t remember anything 😐you could have had a life before but you were dead for a very very long time in fact when you die you go to the same place as if you were not born 😐and eventually you will loose track of time it’s self 😳in fact we could be somewhat repeating our lives and we don’t even realize it 😳after all how would we know earth would form? How would we know it will happen ?we don’t 😐live is very strange 🤔

If I’d had this presentation in school, I may have had a clue, and possibly an interest, rather than staying confused entirely in the weeds, and memorizing instantly-forgotten random facts. At 60 now, I’m finally having fun learning some science!

T=0 for the photon the entire distance travelled towards earth from its frame of reference earth is travelling towards the photon at light speed but hits earth at present time?

Same

On other topics, Neil DeGrass Tyson is a scientific sellout and should not be taken seriously. He has lied on several counts and pushed SCIENTISM (the abuse of science for the sake of pushing a narrative) for his own political gain in certain arenas. Buyer beware.

How you met your lover?

No kidding. So true.

neil is a big dummy dumb dumb

Same.

Chuck tries a bit too hard to unlearn what he learned from Neil over the last couple of years to act surprised. I think it's time for Chuck to graduate from the Tyson Academy and become an equal conversation partner!

Me too

Agreed. I am a civil land surveyor and I use a GPS unit almost daily. It's very cool to hear something That corresponds with the work I do and how it interacts

The muffle isn't caused by any change in the speed of sound, or the time taken for the sound to reach you. It is because of an inverse square law due to the wave-like nature of sound (so it spreads out over an area that has the same curvature as the surface of a sphere). If you're referring to a change in pitch, that is caused by a relative frequency change of said sound, measured by an observer (which indeed is a direct consequence of the distance of the sound source changing relative to you). If the source moves towards the observer, the frequency (pitch) increases; vice versa for a source moving away from the observer. Imagine someone honks their (stationary) car horn for 10 seconds at a distance of 100m away. Say we get z complete cycles of the sound wave in that time. Now assume the same car is travelling towards you at 10m/s, also honking its horn for 10s. As the amount of time is the same, and it's the same horn, you must also observe z complete cycles (oscillations) of the sound (the speed of the sound wave does not change). But as the distance to you is decreasing, then that must mean that the frequency of the oscillations must have increased, as the horn has honked for 10 seconds so the number of oscillations remains the same as earlier (also note that as the frequency increases, the wavelength decreases). Its this increase in frequency that you hear as the higher pitch, and vice versa, as the source passes you and moves away. That is the Doppler Effect.

@@blueboy189 Well, as the car comes closer, in motion, the speed sound, although constant, does change because the car speeding up and slowing down. The only way that it wouldn't, is if I were moving at the same speed as the car. Don't you just love this?

Seems like that's how most things work with science. I hope you're a fun teacher that does experiments and makes learning fun rather then a strict teacher that just hands out home work. Seems most science teachers in my experience are pretty cool.

no he just says wow to everything

Excuse me, that's Dr Neil and Lord Nice to you (and all of us).

Fixed, i'm so sorry. Didn't wanna disrespect doctor Neil deGrasse Tyson and Lord Chuck Nice.

I was looking for the exact term over the internet and indeed it seemed to be the neutron with a different lifetime than the one indicated in the video. Thanks for confirming it!

can u explain to me ... i dont get it, for me its jsut something that its faster arives faster , simple as that....

@@e7danny7m Well, to you a snail seems to move very slowly, but a horse seems to move very fast. Depending on how fast you can go, everything else either seems fast or slow to you. That's a way of saying speed is relative for most things. But light is different. Even if you move at 99.999% of light speed, light will seem no slower to you than if you are only going 1% or less of light speed. The speed of light is not relative like the speed of everything else is. The speed of light is constant to you, no matter how fast you are moving. The only possible way this can happen is if time actually slows down for anyone traveling quickly. Not just that time seems to slow down but it actually slows down. This is depicted in the 80's movie Flight of the Navigator. A kid travels around the galaxy at near light speeds, and when he meets his brother again his brother has aged about a decade but the kid himself has only aged a few days.

@@theboombody seems to me just a theory if we spek bout light speed. And i cant get this in my head.... For me its just things going faster from a to b point, its normal that everything else is doing it slower

@@e7danny7m Extremely difficult, or impossible to experience this theory directly. It has been tested and confirmed by scientists using extremely precise instruments we have no access to. We pretty much have to trust them because we can't test the theory ourselves.

Or, if they could travel faster than light, they could theoretically travel back in time. Imagine a society where said person (or group) could witness what you've described but then speed up and return back with this knowledge to the instant they left.

Crazy to imaging that, that is the perspective of parts of the universe. Although not living, parts of space are experiencing that acceleration, therefore skipping through our perspective of history in less time than we can imagine

They wouldn’t experience anything, because no time would pass for them.

They would only experience anything once they decelerated back below lightspeed. While at lightspeed, they would have no experience because no time passes.

An individual might see some cool things at near lightspeed, but at lightspeed, they wouldn't be able to perceive a thing. Even at near lightspeed, things would probably happen too quickly around them to make any sense of it (like watching a movie at 10000x speed).