The Absurdity of Detecting Gravitational Waves

  • Опубликовано:  6 месяцев назад
  • A head-vaporizing laser with a perfect wavelength detecting sub-proton space-time ripples.
    Huge thanks to Prof Rana Adhikari and LIGO:
    Here's how he felt when he learned about the first ever detection:

    Thanks to Patreon supporters:
    Nathan Hansen, Donal Botkin, Tony Fadell, Saeed Alghamdi, Zach Mueller, Ron Neal
    Support Veritasium on Patreon:

    A lot of videos have covered the general overview of the discovery of gravitational waves, what they are, the history of the search, when they were found but I wanted to delve into the absurd science that made the detection possible.

    When scientists want one megawatt of laser power, it's not just for fun (though I'm sure it's that too), it's because the fluctuations in the number of photons is proportional to their square root, making more powerful beams less noisy (as a fraction of their total). The smoothest mirrors were created not for aesthetic joy but because when you're trying to measure wiggles that are a fraction the width of a proton, a rough mirror surface simply won't do.

    Filmed by Daniel Joseph Files

    Music by Kevin MacLeod, "Black Vortex" (appropriately named)

    Music licensed from Epidemic Sound "Observations 2" (also appropriately named)
  • КатегорииОбразование
  • Длительность: 9:7
  • Тэги для этого Видео:  veritasium  science  physics  ligo  gravitational waves  wave  interferometer  black hole  black holes  interference  gravitational wave  spacetime  laser  detection  detecting  absurdity  detector  gravity  einstein  general theory of relativity  waves  

Комментарии: 4 608

  • Shalva Qutelia
    Shalva Qutelia 1 день назад

    Something tells me that a gravitational wave wouldn't add more distance for light to travel but stretch both it's frequency and the measuring instrument not letting us notice any difference

  • kareszt
    kareszt 2 дня назад

    YEp X 2, 100% sure.

  • MCTanman1
    MCTanman1 2 дня назад

    That fat guy with the glasses doing the explaining, is he indian?

  • İlker gul
    İlker gul 2 дня назад

    Are the effects of g-waves permanent? for example when they were passing through the Earth did they make a change in volume of the planet and does it last now?

  • Ritam Chakraborty
    Ritam Chakraborty 2 дня назад

    how come they know that 1.3 billion years ago 2 galaxy collided into a black hole and created a gravitational wave ?_

  • Gero Nimo
    Gero Nimo 3 дня назад

    I can hardly express the amount of "what" this has brought upon me..
    I am amazed as well as confused.

    I love this channel :)

  • eiyaz00
    eiyaz00 4 дня назад

    Did we know the two black hole collided before the waves hit? Or did we find out after it happened?

  • Jane Kailey
    Jane Kailey 4 дня назад


  • A. K.
    A. K. 5 дней назад

    how do know what a wavelength of gravity is if it's never been observed or detected?

  • The Stuffed
    The Stuffed 5 дней назад

    Yo mama so fat she caused an uncertainty in the frequency and wavelength of two beams of light at the same time and effect as another two beams of light 1000 miles away!

  • Tyler EIN
    Tyler EIN 6 дней назад

    Ligo detects gravitational waves by using the Doppler effect? Light will have a change in frequency when the wave pass and their frequency will be different and there will be a signal? Is this how it works?

  • living robot productions
    living robot productions 7 дней назад

    Space is not a Thing it has no properties ... That is why it's called Space ... This is stupid and makes no sense.

  • David Jackson, II
    David Jackson, II 7 дней назад +1

    So the next step based on detecting all of the black holes in the universe is a star map based on those black holes?

  • cubecube bean
    cubecube bean 7 дней назад

    Need to do these measurements outside into the space.

  • epsilonxyzt epsilon
    epsilonxyzt epsilon 8 дней назад

    min 1:23 must be 1 in 10^-21

  • Christopher Ellis
    Christopher Ellis 8 дней назад

    clever stuff, at least it is not the work of clever fools.

  • Justin M
    Justin M 8 дней назад

    how fast would say a basketball get up to if you put it in the tube then popped the pipe behind it

  • DannyLoveJoy
    DannyLoveJoy 9 дней назад

    If the gravitational wave would come directly from the direction 45 degrees in between the 90 degrees angled arm, would there be a measurement?

  • Skeptical Dreamer
    Skeptical Dreamer 10 дней назад

    a trillionth of air left.. a trillianth detected in change.. hmm.. I wonder.. 😂

  • Gus Ngregg
    Gus Ngregg 10 дней назад

    I always took space as a medium for everything that goes thru it...

    STAGING & LIGHTING SensatioN 10 дней назад

    How is this acuert if the mirrors are moving . These guys are faking it to try and prove gravity. Its not gravity wave its a m.p. magnetic poleses tesla already new this .

  • Gabi Mor
    Gabi Mor 10 дней назад

    heyy what animation software are you using?

  • Richard Smith
    Richard Smith 10 дней назад

    So the trick to detecting if the light was stretched was to make the number of oscillations of the wave on the trip static? If space is stretched it will alter the distance AND time, but also slightly shift the phase of the light, so since the distance and time being stretched is not measurable being within the same frame of reference, this instead relies on detecting the phase shift of the light from said stretching.
    Essentially this machine makes a 'virtual frame of reference' by continually firing new light, each photon having its own frame of reference, and letting that light interfere with each other, and then measuring THAT interference?

  • Louis Cypher
    Louis Cypher 12 дней назад

    that guy describing the laser is probably the coolest scientist I ever seen. even cooler than DeGrasse.

  • IAmAgainst
    IAmAgainst 12 дней назад

    It's sad that despite being clearly a genius he doesn't use a little bit of his intelligence to take better care of his body..

  • Rudi Simon
    Rudi Simon 12 дней назад

    my question is why? Why so much effort for such a non event? They can never reproduce this.

  • Atif Rana
    Atif Rana 13 дней назад

    Such a laid back scientist

  • Lui Cirocco
    Lui Cirocco 13 дней назад

    if two black holes make a ripple in space time when they collide, how big do they need to be to make a big bang?

  • Sh0t
    Sh0t 13 дней назад +1

    Cost to US taxpayers: $1.1 Billion

    • brownj2
      brownj2 4 дня назад

      $1.1 Billion Inserted into our economy, generating some well paying jobs and revealing an otherwise unproven truth for all humans. This has more benefit to humanity than all of the worlds strategic bomber fleets combined. Quite a deal.

  • Arnold Christian
    Arnold Christian 13 дней назад

    What if the expanding of the universe is just a cyclic wave-like motion? like it will start compacting and then expanding again, etc etc. Know what i mean?

  • leo001leo001
    leo001leo001 14 дней назад

    the germans built these machines.

  • Jason Stokes
    Jason Stokes 14 дней назад

    How do they even know that is what they are measuring, and not some other anomaly?

  • John Cloeter
    John Cloeter 14 дней назад

    Somebody get this man a better shirt

  • LaserGadgets
    LaserGadgets 15 дней назад

    Ohohohohoooo yeah :<

  • Vaishnavi H
    Vaishnavi H 15 дней назад

    I did not understand most of the things in there but whatever these guys have achieved is just remarkable and that guy is Indian which gives me even more pride:)

  • Ti DeCoske
    Ti DeCoske 16 дней назад

    Why not put one in space where it can't be disturbed by use

  • Roscoe Coltrain
    Roscoe Coltrain 16 дней назад

    his shirt is an art piece

  • v a
    v a 16 дней назад

    What I don't understand about this is did we just happen to build the LIGO at the right time? Are the waves still passing through? Or are gravitational waves always passing by....? It seems to coincidental that humans build the LIGO and then happen to discover GW's.

  • Brian Kerr
    Brian Kerr 16 дней назад

    there is no such a thing as a gravitational wave.

  • Artur
    Artur 16 дней назад

    I want that guy to say, "You may have been looking for me for the last couple of years, but I have been looking for you all my life, Neo."

  • Nikhil Dewangan
    Nikhil Dewangan 16 дней назад


  • Matthew Bailey
    Matthew Bailey 17 дней назад

    Now imagine how F-ing cool it will look when we can built a LIGO that is several light-minutes on a side.

    We will be able to actually "Resolve" images of the event.

    But in terms of immediate applications...

    I just want to be able to get the kind of Resolution out of Maya in terms of HSV distinction.

    Or to have eyes that can distinguish that kind of resolution.... But then I am into the Realm of John Cavill.

  • Jorge Mori
    Jorge Mori 18 дней назад

    So you're certain what you think you detected was caused by a gravitational wave?

  • ranan rahim
    ranan rahim 19 дней назад

    For those who love physics, this is a video that they can masturbate to. Amazingly presented, thanks @veritasium !

  • Beanshkabob
    Beanshkabob 21 день назад

    A thousandth the width of a proton. You gotta be shitting me. That's amazing.

  • He Richard
    He Richard 21 день назад

    great,so my question is , when trump is going to build the death star

  • Giovanni Stani
    Giovanni Stani 21 день назад


  • George Bond
    George Bond 21 день назад

    wow so smart to detect gravitational waves but they still can't find that elusive Oort cloud.

  • chari Muvilla
    chari Muvilla 22 дня назад

    To annyone feeling stupid after watching: Well you might didn't understand some terms from physics but to be fair no scientist right now knows enough about these things.

    I mean gravitational waves, black holes, how time or space could possibly be affected by other things, all these are things we barely know about. So study them if you want to know but you will always get the feeling that you don't know enough or that many things you know could be proven wrong

  • Phil Jones
    Phil Jones 22 дня назад

    a hundred and fifty years from now. we will be communicating with gravity waves.

  • titaniumslug
    titaniumslug 23 дня назад

    Sounds like the most expensive example of confirmation bias ever.

  • Greg Hawkins
    Greg Hawkins 23 дня назад

    This is America. State distances in inches, feet, & miles, not meters & kilometers & weights in pounds, not kilograms.

  • tuber
    tuber 23 дня назад

    I got news for you genius. No matter what point in the history or future of the universe you existed, you would always feel like "nature doesn't want you to go any further". It's called technological limit.

  • VB. Jayasekara
    VB. Jayasekara 24 дня назад

    So what is the last discovery ?

  • forestsoceansmusic
    forestsoceansmusic 24 дня назад

    Okay, so the Heisenberg Uncertainty Principle may not apply, but the coarseness of the technology is still way too gross to measure something a thousandth the width of a proton. In fact, doesn't quantum mechanics state that the time it takes light to cross a FULL width of a proton is the shortest time there is -- that that time is the shortest tick of the universal clock. This ridiculously-minuscule scale is also the scale at which random quantum fluctuations happen, so surely you wouldn't know if you're detecting gravitational waves or quantum fluctuations.

  • forestsoceansmusic
    forestsoceansmusic 24 дня назад

    And the whole experiment -- is it based on the ASSUMPTION that these supposed 'gravity waves' travel at the speed of light?

  • forestsoceansmusic
    forestsoceansmusic 24 дня назад

    A trillionth of atmospheric pressure still means there will be some Oxygen and Nitrogen molecules to interfere with the beams.

  • forestsoceansmusic
    forestsoceansmusic 24 дня назад

    One part in 10 to the 20th power, but you said earlier that they are trying to detect something in 10 to the 21st power, so their laser-stability is 10 times to coarse to be able to measure such a miniscule event (if indeed it does exist).
    Could you please explain how any orbit is stable if gravitational attraction only propagates at the speed of light. Surely that is too slow even on the scale of the inner solar system -- sunlight takes about 9 minutes to reach the Earth.

  • forestsoceansmusic
    forestsoceansmusic 24 дня назад

    I thought the Heisenberg Uncertainty Principle said we can't measure on such a small scale without our measuring 'instruments (even if we only use photons) affecting the result.

  • plasmaastronaut
    plasmaastronaut 24 дня назад

    an awful lot of resources spent chasing myths. Insanely stable lasers might have some other use though.

  • Dennis Liu
    Dennis Liu 25 дней назад

    It took me awhile to wrap my around on why "more photons you use, the smaller the uncertainty gets".
    Then I realized what the short phrase after it really meant.
    The variation in terms of number of photons will increase, but when compares the numbers of photon varied to the total number of photons used, the percentage decreases, hence less uncertainty.

  • Ebenezer Olutomilayo Fagbemi
    Ebenezer Olutomilayo Fagbemi 25 дней назад

    crazy how the beginning looks like two daughter cells

  • Anubhav Yadav
    Anubhav Yadav 25 дней назад

    sir you always ask the right of u 4 that

  • Metal Gear
    Metal Gear 25 дней назад

    The absurdity of trying to Prove that there is an invisible HOLE punctured into Space...
    Why not just throw a Satellite as far away from Earth as possible actually Testing. How far does Earth's Gravity go beyond Earth's Atmosphere?...

    A simple Scientific test rather than a 300 trillion dollar "We found SIGNS of the Loch Ness Monster's Existence guys!" fiasco...

    Are you fkn kidding me w/ this BS blatant Confirmation Bias of so-called 'Science' charade? gtfo here w/ this nonsense

    Black Holes are like Falling off a Flat Earth except now you're falling into a gd fkn Hole..
    Wtf is the Difference. Neither 1 is REALITY

  • metalko koma
    metalko koma 26 дней назад


  • Scawsome
    Scawsome 27 дней назад

    I say we take the uncertainty, and *push it somewhere else!*

  • Remi Stardust
    Remi Stardust 28 дней назад

    We have to apply some Baysian Theorem here: Having read a long article on this and watching vidoes, I can't give 100% certainty that they ACTUALLY pulled this off. The measurement requirements are absolutely nuts!

  • Morris The Cat
    Morris The Cat 29 дней назад

    1MW infrared laser would vaporise your head? WTF?

  • Omartini
    Omartini 29 дней назад

    what if Time was shifted, and not space? Meaning the measurements are happening at slightly different times.

  • Karol Palazej
    Karol Palazej 29 дней назад

    how do they know the data they get is truly from gravitational waves? what if theres some other signal causing it?

  • Miriam Moore
    Miriam Moore 29 дней назад

    the other guy said 10x the energy of the rest of the universe. hmmm

  • Jaime Monsalve
    Jaime Monsalve 29 дней назад

    If being close to the black holes (at a "safe" distance lets assume), we would be able to percibe with our own senses those gravitational waves?

  • Simon Stebbins
    Simon Stebbins 1 месяц назад

    I'm not sure I trust him, because he appears to be wearing crocs.

  • J Kinney
    J Kinney 1 месяц назад

    Just because you worked hard, with the best equipment, advanced degrees and achieved some result doesn't mean you have proven what you think.

  • guy anello
    guy anello 1 месяц назад +1

    is this man wearing crocs...?

  • Martyn2473
    Martyn2473 1 месяц назад

    Is it just me or is one hell of a coincidence that that wave went pass earth just after we'd built this device. 10 years earlier and we would have missed it?

  • Dheeraj Bhaskar
    Dheeraj Bhaskar 1 месяц назад

    I like how chilled out that scientist guy is (not the host). Is he an Indian btw?

  • Mario Jost
    Mario Jost 1 месяц назад

    The next obvious step from my perspective would be to create a third tunnel to get a sort of 3D measurement. How can they detect gravitational waves if they are coming from directly above? These waves would then have the same impact on both arms rendering the measurement useless. A third arm would solve this problem. I just ask myslef who pays for this stuff? What do they gain by the knowledge based from these measurements? I'd like to beleive there are selfless companies or people that do this for the greater good. In the end, this has to give some kind of payback, i think.

  • Benjie Urbina
    Benjie Urbina 1 месяц назад

    the guy's white shirt is loaded with gravitational waves

  • mouaj
    mouaj 1 месяц назад

    can he detect the gravitational ripples with the wrinkles in his shirt too?

  • Duncan Gray
    Duncan Gray 1 месяц назад

    So, the LIGO detectors work because the gravity propagates at the speed of light. So, why doesn't the mass inside the event horizon of the black hole become hidden from all objects outside of the event horizon ... thereby making the black hole "not heavy?"

  • Omero Diaz
    Omero Diaz 1 месяц назад

    understandable have great day

  • Sabeer Abdulla
    Sabeer Abdulla 1 месяц назад

    So, the light itself is being stretched by the waves as a result of space time being stretched. To counter which, they send in new light to check the difference to the old light. By the time the new light is being made, the wave would've stretched the source of the light, right? How's that factored in?

  • rushabh m
    rushabh m 1 месяц назад

    how do we know that collision occured ,it took information and gravitational wave same 1.3 billion years?

  • Hank Jagt
    Hank Jagt 1 месяц назад

    Neutrinos cannot be removed from the detector so my question is, what impact will this have on the result you see?

  • Ken Kall
    Ken Kall 1 месяц назад

    does a falling apple create gravity waves?????

  • Me Not You
    Me Not You 1 месяц назад

    How do they know ?

  • Movie Spoiler
    Movie Spoiler 1 месяц назад +1

    got asked about this in my a level exam today🙃

  • Ferris Vueller
    Ferris Vueller 1 месяц назад

    When 95% of gravity is unaccounted for (dark matter 27% and dark energy 68%), call me a skeptic.

  • Max Lindner
    Max Lindner 1 месяц назад

    You should show this video to Bill Gates and ask him why my PC necessarily needs to install updates for HOURS every now and then.

  • Nic Morales
    Nic Morales 1 месяц назад

    Beautiful video man, one of your bests! Keep doing this good material!

    With this quality of videos consider entering into a new platform called Steemit, where you may find a lot more of earnings per post and a whole new community rising up. If you do, find me there, I'm @anritco and as a concept designer and illustrator, my hand is yours in case you need it =)

  • Craig Mackay
    Craig Mackay 1 месяц назад

    thanks for a great channel! always leaning something from your videos.

  • Patrik Bergenholt
    Patrik Bergenholt 1 месяц назад

    Fascinating, but what does it cost and how are the results helpful?

  • Anatole Sokol
    Anatole Sokol 1 месяц назад

    wow, holy ONE MEGAWATT!!! is about 1300HP or so... ?

  • Luke Brog
    Luke Brog 1 месяц назад

    I WANt those Glasses 👓 cool AF!

  • Nick Loz
    Nick Loz 1 месяц назад

    This megawatt is singlehandedly causing global warming. Totally worth it.

  • semmering1
    semmering1 1 месяц назад

    It would be so wonderful, to get translation's of this videos, so bad not to understand all of this.....

  • Squidward1314
    Squidward1314 1 месяц назад

    at 8:09 what is the "other thing" where the uncertainty gets crammed into? They measure distance with high accuracy, then what value has high uncertainty and how does that play out in this experiment?

  • Kumar Abhishek
    Kumar Abhishek 1 месяц назад

    Please, I beg not distort the names. Indian names carry a lot of meaning as with many other cultures, so kindly respect that @Veritasium. Very informative video though, nicely explained too!

  • Microawesome
    Microawesome 1 месяц назад

    "the whole thing is bogus, shut it down!!" 😂😂