How Fast Is It - Chapter 8 - Gravitational Waves (4K)

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Why wouldn’t he still be posting?

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​@@kjhmanhe's getting old? He looked very frail a year or two ago but seems to have improved lately.

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@@kjhman He has been doing it a long time, and things can change. I wanted to express my appreciation.

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The legend finally uploaded

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Hello Mr. David! I wanted to thank you for continuing to make these videos for such a long time. I have come a long way in my quest to learn more about the universe and I simply wanted to thank you for being a part of my journey and show appreciation for all of your work that we learned from. What started a few years ago with a simple question has now become a lifelong obsession, and I would be grateful to continue learning from your videos for years to come. I hope you are in great health, its been a pleasure seeing your video pop up after a while. My sincerest regards Mr. David!

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Perfect timing. I'm out on a back injury and love your long form content, especially when i have lots of time to watch it!

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Actually you're in.

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@@sclogse1 I'm in what?

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wonderful... thank you sir

[@Scuzgar]

Thank you so much for your videos. I felt a rough anxiety as I marveled at how violent it must have seemed to Einstein to think about two supermassive objects rotateing at half the speed of light (or realizing this to be a plausible occurrence). How does our little shoebox garden (solar system) last with such awesome power happening all throughout the cosmos, constantly? Through your videos I find a deep love of the surreal epistemological fugue we live in now, compared to our Greek forefathers and all other thinkers of mankind’s world. Hard to reconcile much in light of such fantastic distances, such behemoth masses, and such terrifying forces. I cannot believe we are close to detecting actual evidence of the big bang. Thank you for giving my mind concepts to wander and wonder in the cosmos. God bless you

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Thanks love to hear your voice

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Fantastic video, thank you for making these!

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Finding your channel is truly a gold mine of information and knowledge on astronomy and for that I thank you

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Thank you so much for your wonderful productions!! So much appreciated!

[@mtrxQuarks]

David, you do a great job of explaining the intricacies of astrophysics. I'm impressed. You don't treat the topic superficially, but you explain the details quite meticulously. Additionally, you visualize with images and charts, which is very important. This makes me enjoy watching your episodes.

[@Firenutz]

No matter how fast it is, it can’t compete with how fast I’m falling asleep tonight!

[@SamSpadeLives]

😂😂😂😂 same here man..... these videos knock me out flat within minutes... I love them❤

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This series does such a wonderful job at explaining “why” all this happens.

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Professor Butler's voice is the most relaxing , Thank You

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Thank you for this mesmerizing and fascinating presentation of the material. Absolutely a great achievement.

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I've been watching your videos for a few years, I love when you post long videos with calm and clear explanations, thank you for taking the time to create them. I admire you a lot. a hug from Brazil.

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The Legend Returns.

[@malakiblunt]

just yeasterday was thinking hadnt had a new vid from you in too long. - Nice

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Good man Dave!

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Another fascinating and informative presentation. Thank you.

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Thank you Mr Butler.

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Yay new David Butler video! Love this channel

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Absolutely love your longer content like this. Thank you for making them!

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Thank you, David.

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Was having a pretty bad time as of late, always happy to see you post. Legendary content of the most legendary subjects.

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Sir David Butler is living my retirement dream. I wish I would be so chilled and still doing what I love long after retirement age.

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WOW! You're back! Excellent 👍

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I seriously love you content man, I just found your channel and I will have enough content to last me the rest of my life. Never stop posting. Each video is seriously golden

[@ej2796]

You're the best Dr. Butler...except "here on Earth" we are actually NOT far from anything that could create ripples in spacetime/gravitational waves. Everytime we simply wave our hand, or a butterfly flutters by...gravitational waves are created. They are just FAR to weak to ever be detected. It's kind of a technicality, but true nonetheless. You're by far my favorite space & physics content tho. May you live long and prosper sir! :-)

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Thank you, sir.

[@Mike-ge7pe]

Thank you so much for making these videos David. I’m certain their impact will trickle down to generations of people who will never see them simply through their influence on so many who are watching now

[@bimblinghill]

It must be very satisfying to update the book to account for a breakthrough observation

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Mr David good to hear from you again...

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David, excellent job on these recent Videos. thanks much! You dig into the details, but explain it pretty succinctly.

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Always a pleasure watching your videos. The way you explain things and the pictures and diagrams you use are super helpful

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I can't thank you enough for this sir.

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Mr. Sir! Thank you for making this fun for the kids!

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Glad to see your posting new content…. I’ve been a huge fan since your first videos!!!!

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Wow, l missed this update what it came out. Can't wait to enjoy it! Thank you for another substantial chapter to this journey!

[@luudest]

41:33 Aren't the changes in Earth Rotation, Orbital Motion, disperition delay compared to the change due to the gravitional wave much bigger?

[@howfarawayisit]

Yes they are. But they are small over the very short time period between pulsar peaks.

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David, thank you for your tremendous contribution to education online.

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so excited to see a new upload from you sir!!

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Love your videos, David. Thank you for all the great content.

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I love this man 😭

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David you dont have to redo stuff in better/higer qualliity..your old stuff is still gold...i rather get more stuff from you then you redo stuff...youre awesome and i have learned a lot...all the best from Denmark

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I’ve gotta say, this Is very fascinating! Great production And presentation. Thank you!

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Long time no see! Great to see you´re still releasing more content! Keep it up Professor!

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The best channel on here

[@xJackkHD]

Hi David. Greetings from the UK. I just want to say I appreciate your videos so much, I never saw myself being interested in astronomy or physics but since I found your channel I've got to say I look forward to your next video because I learn so much from you. I just wanted to ask if on future videos, could you please notate which pieces of music you use throughout the video as they are so calm and relaxing, and I'm sure many other people think so too. Thank you again for the videos and I look forward to many more!

[@howfarawayisit]

The music is identified in the notes below the video.

[@SimonMcGrath-o8jk]

​@@howfarawayisit Hi David, what wud happen to u if u were saying 10 light years away from the 2017 black hole's merging to form the gravitational wave event, move out if 10 light years is way too near? I love the video lectures they are truly educational and interesting to the Nth degree from a fan in Liverpool, England and just to sadly let u no that with the riots in England cuz of. the 3 little girls murdered and we're not all like those far right thugs sorry to even mention it.

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I am amazed

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He’s not a standard candle but rather a Saganesque candle in the darkness. Thank you for continuing to burn!!!

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This is what I live for

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Greetings from Sweden 🎉 Lovelies indeed that you are going strong with this channel ❤

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Love your work sir, well done

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Excellent video. I appreciated the math. Sent this to my grandsons. Thank you for the video. I am subscribed!

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"As soon as I released the book.. ..they were discovered!" Hahaha figures right? Thanks so much for adding it. You teach me so much and I'm not even in your class , you da man 💪

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Sir David Butler, thank you so much for guiding me to the faraway universe.

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We miss you!

[@rollomartins6224]

My understanding was always that if you stretch or squeeze space with a gravitational wave, also the frame of reference is stretched or squeezed. And as the speed of light is measured in m/s it adapts to the stretch or speed as well. So you can't notice the stretch or squeeze at all from inside the stretched or squeezed space. But it seems light is not affected by this stretch or squeeze. So you can use the speed of light as an objective measurement. But would this not mean that the speed of light is, from the point of view of a person within the stretched or squeezed space, too high? Higher than the speed of light in vacuum should be? Have to squeeze this into my mind now.

[@wesjones1181]

Thank you Mr David

[@khaledadams4329]

I absolutely love these presentations! Question; at 26:27, "When a gravitational wave passes through the interferometer, and the distance along the arms are shortened and lengthened, causing the beams to be slightly out of sync." Wouldn't the wavelength of light scale up and down with the expansion and contraction of space/time? Or is the expansion and contraction confined to a single axis?

[@howfarawayisit]

The wavelength of the light deviations would be too small to have an impact on the detector.

[@redsix5165]

6:00 what does it mean the it carries momentum AND energy away? What does it mean to remove only momentum from a system?

[@howfarawayisit]

Loss of momentum includes a loss of energy.

[@redsix5165]

@@howfarawayisit thank you for replying. In my simple, non-physics mind systems have energy and as a consequence of moving they have momentum. Your statement seems to say that you add energy + momentum to arrive at the total (?energy) of the system. I have since looked up momentum and had to dig a bit to find an answer that would solve this puzzle. on stackexchange someone stated that according to Einstein E^2 = (mc^2)^2 + p^2c^2… so that is the essential source of my confusion because its only ever been E=mc^2 for me…also if people google momentum… the first thing that comes up is that it is a product of the mass and velocity. I dont think this definition resolves the confusion I have around (E,p) being two separate quantities being removed from the system because v x m seems a lot like what ai conceive energy to be…The only way I can logically make sense of it, is that E=mc2 works for things at rest and if things are moving you need to add momentum. Even now I am still confused bc the total energy in the system must include the contribution from momentum…does the lost momentum create the gravitational wave? Is mass lost and converted to energy and/or gravitational waves or is it all from the momentum? By the way- my comments are meant to let you know what the average but interested person doesnt intuitively understand around the grammar of physics…

[@howfarawayisit]

@@redsix5165 E^2 = mc^2 + p^2c^2 is indeed the operative equation. Also, p = mv so we can write E^2 = mc^2 + (mv)^2c^2. A loos in mass and or a loss in velocity will trigger the release of energy.

[@tomctutor]

General Relativity explains so much: SRely for a start and all its applications, e.g. RedShift and z measurement of galaxies. Then there is bending of light ( Eddington ) Black holes (Chandrashekhar), and now Gravitational Waves predicted by Einstein himself. Other than Newtonian mechanics, EMTheory, The Standard Model, GRely is probably one of the most significant discoveries in mankind's history.

[@KingJames61]

Enjoyed this very much.

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That was awesome! Thank you.

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happy for new video. gonna watch asap

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Finally my guy is back

[@joliteal1]

You are wonderful, thsnks!

[@paulg5376]

Spectacular video, thanks David! One question: If the radius of the observable universe is about 46.5 billion light years, how is it possible that the number of stars within 1 billion light years is around 7% of the total number within the observable universe? It should be a much lower percentage, right? Thanks!

[@howfarawayisit]

There are a large number of great voids with noting in them.

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Hi doctor ! Love your videos

[@deathorb]

Rasclat can die if ya don't know the Butler physics guy, badman for real! Blam Blam, and ting. (and I must add that I found the previous video series very interesting and well thought out - so bravo for being so coherent and mindful in your approach for the layman)