Added: 4 years ago
From: XXXSDESDEXXX
Views: 99,401
Sort by time | Sort by thread (beta)

Link to this comment:

Share to:

All Comments (507)

Sign In or Sign Up now to post a comment!
  • @AndyBJ Light photons are certainly not atoms, they are particles. One photon does not have any mass at all but a cloud or photons/beam of light have mass because they have energy, kinetic energy and E=mc^2 means energy and mass are interchangable.

  • Comment removed

  • Three words: atheist worm chow

  • how come light is being disturbed by ultrastrong gravitational force since it's massless?

  • @63Hertzi It is not massless, everything that moves/can move has kinetic energy or if its still "potential energy" so rest mass. Most things can move and be still so they have kinetic energy and a rest mass but light can never slow down so it only has kinetic energy which means they also have mass because E=mc^2 which means that energy and mass are interchangable.

  • Out of curiosity, could there be a star that is "big" enough to have an escape velocity that prevents light from escaping, but "small" enough to not collapse upon itself? I guess this would be the dark star proposed by Laplace.

  • @TenTonHorse Well its a possibility but if they exist they must be rare because the conditions have to be just right. I believe the star would be very instable. It might be a possible fase for bigger stars before they die.

  • @Ryalnotch Thanks for your reply. I think I once heard Hawkins in a lecture say that there is a limit to how big a star can be before it inevitably collapses into a black hole (he was probably talking about Schwarzschild's work). I guess a "dark star" would have to be exactly balanced in size between preventing light escaping and collapse.

  • LOL - "I've been to a couple of parties like that, myself"

  • What after space?

  • What I always wondered that if it were true (proven) that black holes can act as a "gate" to another part of space, wouldn't the exit act as a black hole too? And if that's the case then would you be able to even "exit" either black hole since their gravity wouldn't allow you too? Wouldn't you be forever stuck inside that "hole" in space? It seems very mind boggling.

  • @CyclonedProductions Well some people think that there are so call "white holes". It is said that whatever gets "swallowed" by the black hole is spat out from a white hole. So you wouldn't get stuck in it since the white hole doesn't gravitationally attract other masses.

  • @TheSteady0

    Except we don't see in space any areas of concentrated energy and matter being spat out. They'd be very, very bright, and space is very, very empty.

    The mass falling onto a black hole only adds to its own mass. That's all that happens.

  • @CyclonedProductions

    The thing is that a black hole shreds to atoms anything that gets to its event horizon. An astronaut would be turned into a stream of inward-falling particles--and killed long before by the bath of hard radiation.

  • Curiouser and curiouser. Lol. I love it.

  • this is so fucking interesting--why isn't science taught like this at school? imagine gravity just being 2X as strong, or 5 times as strong, trying to move would be like a marathon...10X--wed all be dead. But then you keep going to 100 times--Then 10,000X and light hasnt even flinched. 1,000,000X and still nothing!--only at BILLIONS of G's is light effected --meanwhile were fucking dead at 10.

  • @pawndominance1

    Astronauts have done 11-12 Gs. The Shuttle on liftoff is about 3Gs acceleration.

    Remember too that light is just part of a spectrum of ER radiation, from gamma rays down to long-wave radio, all moving at 300,000 km/s.

    But yeah, who'd wanna hang around for 1,000,000,000 Gs?

  • here is the one theory of how extraterrials could have been on earth

    go ahead, those who think are unique in the universe can laught now

  • this man is a true genius, not only does he know this complex theory, he knows how to explain it even to ppl who have no understanding of physics

  • why is jersey shore on television and not this?!?!

  • there was an add for "Quantum Jumping" that popped up when i watched this. it mentioned people who "jump" to change their lives. what a horrible add to show before a Carl Sagan clip.

  • Comment removed

  • what's the music at 5:12

  • where could i find soundtrack for this show?

  • 5:40 to 6:30 feels like im in a pink floyd animated music video lol

  • @TheHolydunk All you touch and all you see...

  • The running gag back at Cornell was WHERE'S CARL?

  • Our understanding of the universe is but a mere infinitesimal dot of knowledge in the vast sea.

    We once knew that the earth was flat.

    We once knew that we were the center of the universe.

    Imagine what you'll know, tomorrow.

    (Men In Black, anyone?)

  • @TheSonicGod

    We once knew that the earth was flat? lmfao that sounds kind of stupid, just saying. We never KNEW that because it couldn't be proven, we KNOW the world is a spere and we can prove it, that's why we say we KNOW.

    People had faith and thought they knew the world was flat

  • @stride7860 Whilst I commend your scepticism, you are missing out on TheSonicGod's appreciation for one of the best pieces of satire in recent history. Enjoy: youtube.com/watch?v=kkCwFkOZoO­Y

  • Because he isn't Fucking stupid and doesn't get afraid of dying and buys into an outdated religion

  • @vexx654 outdated??wats so outdated about your religiouis based laws u coward on??? hahaha

  • I love this guy! Why did he have to be an atheist :(

  • I just loved viewing and listening...

    thanks!!!

  • Why is a particle with no mass affected by gravity?

  • @mirabilis Do a bit of research and you can find out that light does indeed have mass. The gist I got out of the few minutes I was digging was that light doesn't have "rest mass," since it's in constant motion, but it does indeed have mass. An experiment could theoretically be conducted in which you take a flashlight and put it in a zero gravity vacuum and find some way to turn it on. The "force" of the initial light emission would push the flashlight back, thus giving light a measurable mass.

  • @mirabilis As Sagan explained, the essence of General Relativity is that gravity bends space-time. Photons ("particles" of light) travel in a straight line through space, but the presence of gravity bends the space through which the photon is travelling. So it is not directly the photon which is being affected, even though it may appear to be.

  • @mirabilis  The answer is they are not. Einstein proved that it's not light (Photons) that are effected by gravity, but, that it's space/time itself which is effected . This was proven experimentely in 1919 by Arthur Edington from Einsteins special theory of relativity.

  • @mirabilis E=mc raised by 2

  • Comment removed

  • @MajorLeagueGuitarist do you even know what the LHC is doing?

  • I wanna experience 0 G please.

  • Comment removed

  • @MajorLeagueGuitarist Um what? We're not even a blinker nearer from creating a single graviton?

  • @MajorLeagueGuitarist Ehh your and idiot plain and simple.

  • methinks ol Carl Sagan has been on a "trip" or two

  • How many teachers show these videos in class ?

  • @AboutHreinzi not enough

  • @AboutHreinzi I do!

    

  • @AboutHreinzi Sadly, none here in germany..

  • I could listen to Carl Sagan talk about anything. He could describe a penny to me for five hours, or how to tie shoe laces and I would still take notes.

  • the visuals at the end are INSANE!! rip

  • RIP Carl :-) "billions...and billions"

  • "I've been to a couple of parties like that myself."

  • Are black holes flat or three dimensional? They must be spherical because we live in a three dimensional world, right?

  • @jjjjjoey

    I would think so, since the gravitational pull is coming from all sides.

  • @jjjjjoey We actually live in 4th dimensional universe, but if you want to apply certain quantum principals there is 9.

  • @yaik7a how are we in the 4th dimension?

  • @ApostateOfTheDamned There is a large amount of theories in quantum mechanics that have been proven true that also require a 4 dimensional space time universe in fact some require 9 like some types of String Theory.

  • @yaik7a interesting, but i was more curios of how the forth dimension applies to us and what the dimension is like. (sorry that may question was really general last time, also you seem to know a lot of the subject, yet you don't have to answer my question/s)

  • 4:28 - 4:36 who else thought of symphony of science when hearing this? This guy's pretty special, there's little more I can say about him - whenever I watch him speak about the majesty of the universe and the elegance of its processes, I want to be an astrophysicist.

  • I dont really understand how a sun could bend space...Is it all just hypothetical and analogous? But I still dont see why.

  • @maneatingtoilets according to many theories everything bends space-time but suns are so large and heavy that they create gravity, to conclude it's just one way we try to explain gravity

  • 0:08 same music played in the 4 dimensions video, what is it?

  • curiouser...and curiouser.... I love it! Nobody I know speaks like this anymore :)

  • "I've been to a few parties like /that/ myself!"

  • HE MADE IT ALL CLEAR TO ME! I love this guy. All the things that are hard to understand become completely clear when I listen to him.

  • ANYONE KNOW THE NAME OF THE MUSIC BEGINNING AT 5:10???? PLEASE REPLY OR GIVE ME UR IDEAS

  • @TheJimzhe842  carl sagans cosmos series

  • This wormhole-theory is where he derived his physics for the book "Contact" where a single Earth-ship was transported throughout different places in the galaxy to the center, in about an hour, remained there for 2 days, and then ended up exactly where it started and only a short time had passed (20 minutes in the book, a split-second in the movie).

  • Gravity doesn't affect light, it affects the SPACE through which light travels; if light is completely reversed, then theoretically the hole disappears from the Universe.because the space is completely curved.

  • This is an excerpt from his historic television series Cosmos. The episode is titled The Lives of the Stars.

  • Anyone know the name of the piece in this?

  • 9 people incurred the effect of thousands of Gs. Actually they were trees...

  • @f1f1s

    Lots of people experienced thousands of G's... when they hit the ground in plane-crashes.

  • @mintez54 so your saying your theory is 100% accurate? u have a dictionary use it,Now u can even make a page on your own defenition of a "theory" and put it on wikipedia, keeps u irrelvent. So your theory is 100%?

  • @mintez54 theorys remain theorys, scientific theory, is not in no way a scientific "FACT" can u grasp on that?a well observed assumption is not 100% accurat in no way, self-proclaimer.

  • @mintez54 a cyber vigilanti 'bravo 'bravo, u must comando rightouse, with your comando ignorance, Now your attacking me? And judging me, u must be one of the teenage mutated monkeys

  • if gravity is so f heavy, how the hell did we go to the moon? Gravity is sustaining all the planets & Stars.

  • @1billion1deaths1

    How we got to the moon?

    Take one million individual parts.

    Assemble.

    Fill with kerosene, liquid oxygen and liquid hydrogen.

    Place three highly skilled pilots on top.

    Light fuse.

    Run.

  • @1billion1deaths1 Gravity is heavy, but firing anything up at enough speed will push it out of earth's orbit.

  • @mavs2147 Its still very mine blowing intense concept to really understand.

  • @1billion1deaths1 especially if you still believe in god

  • @smokemylungsblak Especially if u believe in anything which equals to nothing. You must b one of thouse who have tookin the pill lmao

  • @1billion1deaths1 That doesn't make any sense.

  • @mavs2147 your understading of creation is nowhere to be found. Your actually a dog descendent....you have no philosophy/belief. Survive to fit or coward under govern/religious laws u choose ape descendent.

  • @1billion1deaths1 My proposal is simple: show me evidence of god's existence, or keep quiet.

  • @mavs2147 my proposal is also simple the understandings of creation and equality has given the human population Understandings based on "LAWS" that govern not just the land but reality in general , This understanding is born naturual to humans via the fruit of the tree of knowledge of good and bad. If u dont understand the philosophy of love u dont understand god. So move on

  • @1billion1deaths1 Via the fruit of the tree of knowledge of good and bad? It's fucking ridiculous arguing with a creationist. When someone is so backward, it's like talking to a brick wall. You might as well believe the sun revolves around us.

  • @mavs2147 I am yet to come across a humble atheist on youtube. Please make an effort and be the first.. Respect other people's worldviews!

  • @ohedd Why do people say beliefs should be respected? If someone believed in Santa clause when they were 30 years old I should respect that?

  • @mavs2147 if enough people believe in it and if it has had enough impact on society, then yes.

  • @ohedd Oh, like the Nazi movement in the 1930s? Yeah, a lot of people believed in it and it certainly had an impact on society...

  • @mavs2147 Yes, national socialism is to be respected. Especially you should agree on that as eugenics was a scientifically supported basis.

  • @ohedd Respect Nazism? You're crazy.

  • @mavs2147 No I'm not crazy. I'm saying you should not disrespect the Germans for sympathizing with the nazis in the 30s', it could've happened to any people and the prevailing sociological circumstances allowed it to happen. An entire population can't be evil, and I'm sure you wouldn't say that about the Germans today. The same way you can't say all religious people are to be disrespected, especially as most of them are probably just as peaceful as you are.

  • @ohedd I give people the general respect they deserve. I just don't feel that I have to respect their beliefs. I generally respect religious people, especially if they're good people, but that doesn't mean I respect what they believe.

  • @mavs2147 Ok, then let me rephrase; Do you respect the fact that they believe? There will always be different theories- religious, scientific, political, or whatever. The least we can do is to respect the fact that it has great importance to people. I'm definately not saying we should all agree, just not look for differences and get hostile about it. I know it's hard for me to respect gender studies. I think it's like the dumbest shit ever, but I don't want to make enemies with them.

  • @mavs2147 its even more ridiculous when your understanding for philosophy is pertty lame. Try understanding basic philosophy befor u try talking to me u retart descendent.

  • @1billion1deaths1 Ohh you got me good. That means a lot coming from a retard that can't even spell. Try understanding basic knowledge, period.

  • @1billion1deaths1 Tell me, how is my understanding of philosophy lame?

  • @mavs2147 Id bet you'd like to know, Your understanding for basic philosophy is lame because u dont accept the belief and understanding of good and bad. No god=No creation=NO equality=No love=No purpose ...christianity claims moral truth!!!! Good and bad!! This is found through the philosophy of equality and the understanding of whats good and bad. So if u believe in morality u believe in god,,and if u believe in "equality" u must believe in creation.Philosophy is wat seperates us from the rest

  • @1billion1deaths1 I do accept the belief of good and bad, so the rest of your point is moot.

  • @mavs2147 Then u accept "beliefs". How do u think "equality" comes about?

  • @1billion1deaths1 Equality as in "everybody is equal"? That's something we have instilled in this society. In other societies, women are still the lower class. It used to be that same way for every minority, even here.

  • @mavs2147 Yes but its the belief that every man and women is equal that finds love. And with that belief comes great understanding ,, realization that you and me and every human bein have the same capacity. Realizing this brings "LAWS" of "equality" that were found through philosophy "human higher understandings".

  • @shockoflogic wats so funny..have u come to high understandings??? will u prosper correctly like a healthy fruit bearing tree or will u die out like a weak tree. If u follow laws that come from "idea" that are define by "belief" and high understanding of the tree of knowledge of good and bad. Or are u a Animal ..with no purpose? If so survive to fit..dont cowar under religiouis beliefs of morality.

  • @1billion1deaths1 i like your comments. they're silly. :)

  • @shockoflogic silly enough to reason with animal likes?

  • @smokemylungsblak wat your a fuking retart..your god understanding is nowhere to be found..stick to animal rights...survive to fit...stop being a fat pussy relying on rules and laws created by religioun/belief/philosophy. Stick to your caveman tacktics kid

  • @1billion1deaths1 i was being sarcastic. how could you believe in god with all this information. eat a dick

  • @smokemylungsblak god is equality and the philosophy of good and bad, if your understanding does not go that far just leave it alone and move on.

  • @mavs2147 That would be called escape velocity.

  • @mintez54 theorys is no were near a "fact" can u grasp on that?? if your assumption based on billions of years ago were 100% accurate ther would be nothing to debate about, but seeing as its not. All u christian?? LOL your a self proclaimed christian, just like im a self proclaimed power ranger u dont impress anyone. Obvouisly u got no christian values, seeing as u attacked me and put your god and modern knowledge in two diffrent sections, watta a Joke!!

  • "FACTS" are "FACTS", theorys remain theorized.

  • What do u mean by that

  • Heaven is real!

  • we are currently working on worm hole configuration! ^.^ its officially awesome.

  • i like the way he accentuates his "P"s.

  • Learning about black holes though Alice and wonderland who else could do it

  • I've learned more from Carl Sagan than I ever have in school

  • @shitonawall I learned psychological torture is school, it was kinda fun. But then again I am a slave worker and deserve no more.

  • I'm sorry but I'm having the hardest time visualising this.

  • Its a very nice fantasy to think that you have some time portals inside black holes, and while its not entirely impossible - its a little too far reached to be considered seriously...

    I doubt we will crack such mysteries in our life time, too bad :(

  • Comment removed

  • duuuuuuude it just like mass effect man......

  • damn it what's the music.

  • @cuadfromts IKR I really want to know te name of musi at end!

  • imagine how cool this would be redone with computer animation instead of how they seeminglly penciled this one together :-)

  • 9 people fell into the black hole

  • i could listen to carl talking about hemorroids

  • @xDeadmauZx One of those rare YouTube comments I actually LOLed at.

  • @xDeadmauZx Carl Sagan forbid

  • @xDeadmauZx MMMILLIONS AND MMMILLIONS of blood cells...interacting with FECES

  • This dude is a genius

  • This is so beautiful I'm crying.

  • @Internetaddict666 get yourself together

  • @AngeloNiklis it's easy to understand. imagine the universe as the surface of an expanding balloon. the surface is 2d, the balloon though is 3d.

    Our universe is 3d and is curved in a 4th dimension

  • "I've been to a couple parties like that myself..."

    Carl Sagan is a boss!

  • Black Holios LOL as believable as bevis and butthead just more quackademic hollywood crap from the degenerate minds who control the media and academia.

  • Agent smith

  • I have a couple of questions. First, does this mean that gravity in the 3rd dimension bends space into a fourth? And, since time is part of the continuum itself, does it mean gravity bends that too?

  • @Voiderify Yes, that is in fact, the case. Both space and time are bent, for example, close to a black hole. Interestingly, time becomes so bent or "compressed" near the event-horizon of a black hole, that if a traveler fell in, he and his craft would experience the end quickly. (CONT.)

  • @Voiderify (CONT.) But if we were able to somehow view him with a high-power telescope, his trip towards the event horizon would seem to become slower and slower. Eventually slowing to a near stop. It would seem to take hundreds or thousands of years for him to fall in from our perspective. Where from his perspective, it would be mere minutes. This is analogous to what happens near the speed of light. The closer you get to the speed of light, the more time compresses.

  • Anybody can use their brain as much as Carl does, they're just too into a pleasureable life. I think thinking as advanced as I possibly CAN think is pleasureable.

  • how does gravity affect light? I don't understand. can someone explain why gravity can pull light?

  • @JohnF30Music

    Because light travels on photons. L2Physics.

  • @JohnF30Music I think that light is also matter...apart from 1 of 4 of the greatest forces, gravity is always stronger, even stronger than empty space itself.

  • @JohnF30Music Light is made of pure energy. Einstein found that mass and energy are the same thing, so light is actually mass with a weight.

  • @JohnF30Music Theoretically, light has weight. But only when moving - if you were to stop a photon, it would completely convert into energy and the photon is gone.

  • @JohnF30Music It's not so much that gravity bends light but that mass curves space so that the light is forced to follow a curved path as it approaches massive objects.

  • @JohnF30Music

    apparently photons have mass?

  • This music at 6:25 is making me cry... wtf, now I feel nostalgic... xD

  • In the graph paper analogy, what is pulling the balls through the 4th dimension to create the spacetime "puckers" that we feel as gravity?

  • @KayBeeEee1983 It's not being "pulled" through spacetime. It's distorting it. The spatial distortion just happens to look the way this analogous distortion looks, specifically because both are proportional to energy and size. Energy is really what distorts spacetime, and anything with energy does so. If you had a box filled with nothing but light, it would weigh more (distort spacetime more) than a box with vacuum inside. To understand how, we need General Relativity.

  • @goodnightsty I understand the distortion, I just don't understand how the distortion causes the "attraction" of gravity. In the analogy, it's 3D gravity distorting a 2D plane.  Take away the 3D gravity, and the balls wouldn't distort the plane anymore.

  • @KayBeeEee1983 Ah, okay. The reason the distortion causes "attraction" is actually simple. Nature minimizes what is called the Action, which means that when objects go between points, they do so in the shortest distance. For flat space, this is a straight line. In curved space, it is ALSO a straight line if you are in the curved frame. But if you view it from our frame (which appears flat), it LOOKS curved. So really, all objects are just following the curves of spacetime. Look up geodesics.

  • Comment removed

  • @goodnightsty The graph paper demonstration makes it look like a mass STRETCHES spacetime, but if I understand you correctly, it actually condenses spacetime. Is that right?

  • @KayBeeEee1983 That's the problem with this analogy,on the 2D surface it's gravity (i.e. the weight of the masses ) which create the "puckers". It's like using gravity to explain gravity....it doesn't really work.

  • Dude those animations at the end.... Woah!

  • I finally figured it out, he sounds exactly like Agent Smith from Men in Black

  • too much speculation for a scientist. if a video was little longer he would say the Virigin Mary might have entered heaven alive through a black hole:)

  • @MrJudube Speculation is good for the brain, as long as you keep it theoretical instead of claiming it as fact. It keeps your mind active and creative. Einstein said imagination is more important than knowledge.

  • that fucking cat. Just sits there. Gravity be damned.