Was the Gravitational Wave Background Finally Discovered?!?

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A few weeks ago a large team of gravitational wave astronomers announced something pretty wild. The moderately confident detection of pervasive ripples in the fabric of space time that presumably fills the cosmos, detected by watching for subtle connections between the signals from rapidly spinning cores of dead stars in our galactic neighborhood. In other words, the gravitational wave background has probably been detected using a pulsar timing array.
Thumbnail Image Illustration Credit: Olena Shmahalo for NANOGrav
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00:00 Introduction
01:02 Relativity and Gravitational Waves
02:21 Discovering Gravitational Waves
03:49 Gravitational Waves & Pulsars
05:04 Pulsar Timing Array Discovers GWB
06:48 Understanding the GWB
07:55 Are Pulsars Seeing Gravitational Waves?
09:00 Correlated & Anti-Correlated Pulsar Rates
10:07 Hellings and Downs Curve
11:44 Binary Supermassive Black Holes
13:39 NANOgrav Frequency Spectrum

Опубликовано:

31 май 2024

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Комментарии : 1,4 тыс.

@igortolstov487 10 месяцев назад

Kudos to the team responsible for visual effects on this channel. They do amazing work

@johnmorrell3187 10 месяцев назад

That swimming astronaut near the beginning was... Certainly something

@dinogt8477 10 месяцев назад

remember

@SomethingEternal 10 месяцев назад

I started watching this channel before my name had "GameDev" in it (when I wasn't eating, sleeping, breathing and dreaming mathemathics.) Even when the on-screen formula was illegible, I could always understand the demonstrations clearly. Even if hitting myself in the back of my own head with a ladder walking into a shed sounds strange, they've always been able to make digesting it extremely easy by visualizing it well.

@synisterfish 10 месяцев назад

The visuals help sell the new cosmology/mythology. Not as many people would believe in the new mythos if it were only available on the radio...

@Pain53924 10 месяцев назад

@@synisterfish Hi intelligent person Question: Normally a star is stable because the its own gravity is balanced by force produced inside the star due to nuclear fusion. How are black holes stable then i.e. why isn't all the mass of a black hole in the singularity?

@some_words2112 10 месяцев назад

Love the Anton and Dr. Becky shoutouts. Anton in particular deserves all the love.

@EvenTheDogAgrees 10 месяцев назад

And Becky deserves all the peace. And Vash has plenty of both to go around!

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@emceeboogieboots1608 10 месяцев назад

@@JoshuaRolen Dude, you are throwing this in everywhere! What gives? When AI can copy the Aussie accent correctly, we can be sure we are near the singularity 😔

@MrDowntemp0 10 месяцев назад

Hello wonderful person!

@peggyking9543 10 месяцев назад

Awesome trio - Matt, Anton and Dr. Becky. Life is good - though apparently really complicated 😂.

@himynameis3664 10 месяцев назад

I just love how you guys can communicate science to the layman such as myself. Ye make everything so accessible. I dunno, i reckon that ye deserve an award of some sort. Its always interesting and i always learn something new and fascinating. Thank you for the hours of entertainment and education. Favourite channel by far

@hassassinator8858 10 месяцев назад

Why are you talking like a pirate

@helenamcginty4920 10 месяцев назад

I understand the words. Its once he puts them together I can follow for 10 minutes or so then my brain hurts.

@wenchinatrenchcoat8459 10 месяцев назад

No other show has as much rewatch value Space Time.

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@hassassinator8858 10 месяцев назад

@@JoshuaRolen 😭

@SeanGhaeli 10 месяцев назад

I'm so happy this channel is still around, it was a driving force for my interest in physics back in high school 6 years ago. Fast forward to today and I'm less than a year away from getting a degree in engineering physics

@sebastiano97 10 месяцев назад

Brooo Im also in engineering physics in part because of this channel! 2 years till graduation, see ya on the other side.

@Pain53924 10 месяцев назад

@@sebastiano97 Hi intelligent person Question: Normally a star is stable because the its own gravity is balanced by force produced inside the star due to nuclear fusion. How are black holes stable then i.e. why isn't all the mass of a black hole in the singularity?

@FPSIreland2 10 месяцев назад

@@Pain53924that’s a fundamental question in general relativity lol, if you answer that you’ll probs get a Nobel prize

@brandonwalker5011 9 месяцев назад

While I agree with the above comment that this is a very hard question, there are some explainable elements. Some matter orbiting a black hole have very large angular momentum relative to the singularity which allows them to continue orbiting for some time. The other important thing to remember about singularities is that they are both an anomaly in terms of space being a point of infinite density, they are also anomolies in terms of time. Things that have fallen into the singularity from the point of view of the singularity, as much as that can even make sense, may appear to us to be still falling in. Also matter that does fall in will eventually escape via Hawking radiation but as far as I know it is not known why.

@00alexander1415 8 месяцев назад

@@Pain53924 Stability means different things for planets and for black holes. What we call "Black Hole" is what light does around a singularity, where "most" if not all of the mass is. For all we know the Singularity could be a "solid thing". Black Hole is the phenomena of space-bending by what seems pretty much infinite mass in a finite area.

@gheckolock81 10 месяцев назад

I've always believed in galactic giga whales. So glad to see space time positing a theory of their existence.

@almightysapling 10 месяцев назад

No one can prove they don't exist. That's good enough for literally billions of religious people, it's good enough for me!

@CAPSLOCKPUNDIT 10 месяцев назад

I am delighted they were proposed as an explanation, and eagerly awaiting confirmation that it wasn't just a fluke.

@Numba003 10 месяцев назад

@@almightysaplingAs a Christian myself, I would like to say that I don't blindly pin my faith on "can't disprove God" notions alone.

@gheckolock81 10 месяцев назад

@Numba003 as a Freman of Dune I agree.

@AdamBoozer 9 месяцев назад

69 likes Nice.

@dragonslayerslayerdragon5077 10 месяцев назад

Your graphical representations are phenomenal.

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@lyrimetacurl0 10 месяцев назад

@@JoshuaRolen 😒

@The1stDukeDroklar 10 месяцев назад

@@JoshuaRolen Detox for a few months... including weed.

@thelegendofzelda187 10 месяцев назад

@@The1stDukeDroklarI'm trying

@The1stDukeDroklar 10 месяцев назад

@@thelegendofzelda187 It's definitely important for one's mental health.

@daxmasterflex3494 10 месяцев назад

My favorite is when RU-vidrs reference other RU-vidrs similar videos, knowing their audience has probably seen said videos instead of bickering about who did it first or best.

@Didymus20X6 10 месяцев назад

I think most of these science types are more concerned about the information than they are about their egos.

@JoshuaRolen 10 месяцев назад

You must listen to the speach closely, Matt has been replaced with an AI

@daxmasterflex3494 10 месяцев назад

@@JoshuaRolen lol

@minotaurbison 10 месяцев назад

It tickled me to see my other favorite science youtuber, Anton, in your video. You both are awesome creators!

@nazarinoutama8269 10 месяцев назад

I see you are wonderful person as well

@Pain53924 10 месяцев назад

@@nazarinoutama8269 Hi intelligent person Question: Normally a star is stable because the its own gravity is balanced by force produced inside the star due to nuclear fusion. How are black holes stable then i.e. why isn't all the mass of a black hole in the singularity?

@Demonrifts 10 месяцев назад

@@Pain53924 A black hole IS the singularity. I assume the part you're getting confused about is the event horizon of a black hole, which isn't part of the mass of the black hole itself, its the radius around it in which gravity is too strong for anything to be able to escape. The event horizon is like the top of a waterfall while the actual black hole would be the lake at the bottom. Water going over the edge of the waterfall isn't part of the lake, yet, but its the point of no return, and that water will invariably become part of the lake soon.

@Pain53924 10 месяцев назад

@@Demonrifts Oo thanks

@bootskanchelsis3337 10 месяцев назад

Dr. Becky too !!!

@r1b3y38 10 месяцев назад

Channels like this are so important because monumental discoveries like this are otherwise buried in the noise that is our grasping pop culture soup. I’m constantly appalled that you never see coverage of these stories in mainstream media. (I’d say news but we don’t really have mainstream news sources anymore other than local newspapers.)

@Jhary7 10 месяцев назад

While I did watch Dr. Becky's video first, it's important to get the information from multiple sources... I'm happy you referenced her, as that's added evidence of the quality of her channel. Thank you.

@EPMTUNES 10 месяцев назад

Dr. Becky knows black holes like the back of her hand! One of the best astrophysics communicators of our generation.

@bootskanchelsis3337 10 месяцев назад

Im addicted to Dr. Becky ...and Sabine Hossenfelder.

@Jhary7 10 месяцев назад

@@bootskanchelsis3337 I just ran across Sabine Hossenfelder a week, or so, ago. The algorithm is finally bringing more positive content my way. 🤣

@newrev9er 10 месяцев назад

This channel continues to be among the very best on RU-vid! Thanks so much for making these amazing discoveries a little more accessible to all of us! ...also, galactic gigawhale t-shirts when?

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@alt3space 10 месяцев назад

@@JoshuaRolenPlease get some sleep soon, you’re delirious

@The1stDukeDroklar 10 месяцев назад

@@alt3space That's EXACTLY what an AI trying to cover for another AI would say 😝

@shruggzdastr8-facedclown 10 месяцев назад

@@The1stDukeDroklar: Prove that you're not another AI behaving likewise yourself

@The1stDukeDroklar 10 месяцев назад

@@shruggzdastr8-facedclown I compute, therefore I AM... Oops 😜

@marcusw3459 10 месяцев назад

Not to be *that* guy, but I know you value accuracy, so I have to point out that LIGO first detected gravitational waves in September 2015, not 2016. I say this with all humility and want to close by telling you how much I really love and appreciate what you do at Spacetime- thank you for opening new worlds to those of us who otherwise would not have access 🙂

@axetroll 10 месяцев назад

This will change everything, recall newton right now!!

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@Scotty-vs4lf 10 месяцев назад

@@JoshuaRolen ur joking right

@derfalschejunge 10 месяцев назад

@@Scotty-vs4lf Or is it an AI generated comment? 🤔

@OriginalPiMan 10 месяцев назад

Was the result published in 2016, perhaps?

@gehteuchnichtsan7911 10 месяцев назад

this makes so much sense to me. that's why the universe on a macro scale looks like the light reflections of surface of water in motion, like a pool or something.

@WeaselBass 10 месяцев назад

3:19 "Inspiraling Stellar Corpses" is a great metal band name

@pbsspacetime 10 месяцев назад

🤘

@JoshuaRolen 10 месяцев назад

You must listen to the speach closely, Matt has been replaced with an AI

@disbelief3911 Месяц назад

@@JoshuaRolenWe all have 🤖

@LaunchPadAstronomy 10 месяцев назад

As always, I'm blown away by your visual and written explanations. You are the channel I want to be when I grow up.

@onecst 10 месяцев назад

I just watched your video about this. It, too, was a great watch.

@LaunchPadAstronomy 10 месяцев назад

@@onecst wow, thank you!

@Eamenic1 10 месяцев назад

Ha, funny seeing another channel i'm subscribed to here.

@cvayas. 10 месяцев назад

This is rad! We are all perpetually roaming, fleeting gravitational-waves

@yossarrian 10 месяцев назад

the way i understand the axion (not at all but a huge fan of Space Time) this is precisely true, but essentially infinite.

@MCsCreations 10 месяцев назад

Yes... But can someone please stop it? I'm getting dizzy... 😖

@cvayas. 10 месяцев назад

@@yossarrian love the poetry in your reply!

@yossarrian 10 месяцев назад

@@cvayas. you are too kind

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@maxsykes8622 10 месяцев назад

before I even watch the full video, I just want to say I love the fact that I never have to panic about 'when will the next video come out that I can binge??' because, if science is happening, you can best believe Matt and the team are going to comment on it. And, as everyone always points out, it's at a level that most can understand! Thank you so much for everything you do.

@mikeroni 10 месяцев назад

It’s amazing we’ve been getting this kind of quality information for years through public funding such a good channel

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@ethzero 10 месяцев назад

Nice nod to Dr Becky Smethurst and Anton Peteov's excellent RU-vid channels!

@yourguard4 10 месяцев назад

Omg, Matt has super massive black holes close to his heart?😱 Sounds dangerous....and bad ass.

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@andrewkepert923 10 месяцев назад

To an astrophysicist, “close” = “within the Virgo supercluster”

@ThoughtsAreReal 10 месяцев назад

The truth is out - Matt is a gigawhale.

@Mohammad__M__ 10 месяцев назад

@@ThoughtsAreReal yes! the only way to keep a SMBH in his chest is to have another SMBH or lots of stars binding it gravitationally

@sladewilson9741 10 месяцев назад

Maybe the super massive black hole is his ass.

@diabendoindia9707 10 месяцев назад

Fantastic- the animations and explanations are literally and figuratively out of this world

@steelgreyed 10 месяцев назад

We spent 1,000's of years trying to make the most precise clock possible, using everything from Astronomy to technology to both. Then about 100 years ago, we figured out the Universe really doesn't care about precise time, and we've been trying to figure out what to do with that ever since. This is the best application I've seen yet. :)

@ChrisChoi123 7 месяцев назад

As a theoretical comsologist working on this myself, i was very excited with the new nanograv results. it has more tight bounds on various predictions frmo beyond-GR models, like massive gravity, which is what im working on.

@mj.ray0898 10 месяцев назад

I've been really interested in all the discoveries and space missions that have been happening the last several years, and channels like this one help so much to understand this stuff without needing a degree in quantum physics or something. Thanks for these!

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@thealliesarejews 10 месяцев назад

I honestly cannot appreciate this the existence of this channel enough. So many scientific advances, theories, and just incredibly complex things are broken down so that the average human being can understand. I am always amazed and will continue to look forward to each video, just to see the newest advances of humanity. Thanks SpaceTime!

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@thomaskilmer 10 месяцев назад

Oh shoot, I did my undergrad capstone on how ALIGO or the Einstein Telescope wouldn't be able to detect gravitational background waves. So it's really cool to see researchers found an alternative way to measure it! Thanks for the update, I'd stopped following this field, so I'd have never known without this channel!

@markahenda 10 месяцев назад

Love the shoutout to Dr. Becky at the beginning! She's great, also an amazing science communicator. :)

@JacobProbasco 10 месяцев назад

Is it just me, or is space getting even more amazing?

@colinhughes6635 10 месяцев назад

No. It's just you. LoL

@kriegeryt 10 месяцев назад

I think most things do as understanding increases, right up until they don't, so you're probably not alone.

@cabanford 10 месяцев назад

Wow! I actually could follow an entire episode 🎉🎉🎉 Love your channel (thanks for throwing the occasional "softball" 🤗)

@garyfilmer382 10 месяцев назад

Wibbly-Wobbly right through the universe, it all vibrating waves, rippling through space-time. This gravitational wave background is fascinating, we have come such a long way in our understanding of the universe, thank you, excellent video.

@tonynussbaum 10 месяцев назад

This show has gotten pretty damn technical over the years. I love it.

@cyanah5979 10 месяцев назад

The LIGO configuration somehow reminds me of the Michelson-Morley experiment. I'm wondering if we could detect an absolute vector of movement against the gravitational background?

@stuartdparnell 10 месяцев назад

It IS the Michelson-Morley experiment with a precision magnitude of 100x. If their inferometer was 2m wide, LIGO is 4km. So the "aether wind" wasn't disproven, null result does not mean it is disproven - it came back as gravitational waves!

@CodyEthanJordan 10 месяцев назад

Something else to consider is that a vector of motion against something isn't absolute, thats relative. We can already detect motion against the CMB or stars via light waves.

@emanemanrus5835 10 месяцев назад

@@stuartdparnell not a physicist here: what about if we tilt the M&M interferometer 90° vertical ? (making it working on a vertical plane?). What if the aether would existi and "move" from the above space in the earth direction? I'm thinking about superfluid quantum spacetime models, imagining the gravity as a manifestation of spacetime quanta flowing towards the Earth, in a radial direction, generating pressure. Could M-M's interferometer have found anything in that configuration? (laying on a vertical plane?)

@kylelochlann5053 10 месяцев назад

@@emanemanrus5835 The orientation makes no difference whatsoever.

@emanemanrus5835 10 месяцев назад

@@kylelochlann5053 sure on a flat plane (I know they repeated the experiment from every possibile angle 360°, but the instrumentation was laying horizontal). But on a vertical plane? Did you mean also the vertical case ?

@Yumari-Mai 10 месяцев назад

I've watched an explanation on a different channel and read an article on GWB before, but PBS really brought home the idea of angular correlation and anti-correlation, so I'm hugely thankful for that. I feel like I finally understood why this detection was possible in spite of all the possible sources of timing differences. Great stuff, and I hope we can learn more about gravitational waves in the future, most notably pinpoint the source of their background.

@morganisles4222 3 месяца назад

Does correlated and anti-correlated mean that the waves interfere constructively or destructively?

@SoulDelSol 10 месяцев назад

Thank you opera for supporting these videos

@GerinoMorn 10 месяцев назад

I know we presume it's not, but if the Universe was finite and bounded, would analysis of that "noise" potentially allow to detect interaction with the boundaries?

@roneyandrade6287 10 месяцев назад

There are no models that predict any kind of boundary even in a finite volume universe. There's no "outside" of the universe but perhaps you could get measurements of the curvature (wherer it's finite or not) of the universe.

@kafirekufr 10 месяцев назад

We don't presume anything. As far as a scientist is concerned, there could even be a creator. So boundaries of the universe are most welcome. But, we must test the hypothesis that there may be a boundary. Think about how you would test it and how it can explain existing universe and you have yourself a theory. Good luck 🤞.

@oriraykai3610 10 месяцев назад

@@kafirekufr Who's "we"? Atheism is firmly built into the core of these theories from the ground up. It is assumed that there is no God.

@CodyEthanJordan 10 месяцев назад

Presumably the boundary would also interact with light waves, which would probably be much easier to measure

@vurpo7080 10 месяцев назад

@@oriraykai3610 These theories make no statements regarding the existence or nonexistence of a god.

@RagaarAshnod 10 месяцев назад

Opera being everywhere and nowhere, but greatly appreciated in this vast gravitationally bumpy version of spacetime :mattbot:

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@matl7560 10 месяцев назад

⁠@@JoshuaRolenDid the real Matt get kidnapped by Opera?

@freddan6fly 10 месяцев назад

Love the shoutout to Anton Petrov and Dr Becky Smethurst.

@cleversonsutil4495 10 месяцев назад

0:40 Really great from you for mentioning Dr Becky and Anton channels! I follow them and watch their content.

@gurk_the_magnificent9008 10 месяцев назад

The fact that there is such a thing as “gravitational wave astronomer” is amazing 🤯

@drakomus7409 10 месяцев назад

so amazing that we are wasting money on 'gravitational wave astronomers' instead of cleaning up east palestine ohio or flynt michigan water 🤯

@gurk_the_magnificent9008 10 месяцев назад

@@drakomus7409 you know these things aren’t mutually exclusive, right? 🙄

@drakomus7409 10 месяцев назад

@@gurk_the_magnificent9008 30trillion in debt, maybe learn basic maths and how to balance a budget. if the money went to cleaning up the water GURK, then the crooks wouldnt be able to steal it. savvy? btw, that gravitational research center(HANFORD) has been getting billions for 30years to clean up the nuclear waste leaking into the water tables, the contractor gets 100million a year for NOT cleaning it up, they call it '90% job completion' each year. if they actually cleaned it up then they wouldnt be getting billions every year to clean it up.(SOURCE: I LIVE HERE) DEFUND THE DoE

@ardag1439 10 месяцев назад

Take a moment to gravitationally wave back at all the black hole pairs who made these studies possible

@drabbyvideos 10 месяцев назад

So on point! 👋🌌🌌🌌

@saumyaladhani 10 месяцев назад

Amazing video giving air to the spark of curiosity in numerous young minds. At 4:42 the formula should be distance = travel time * speed of light.

@baseformrolf6710 10 месяцев назад

Shoutout too my boy anton, bro’s smile at the end of the video always making my day good 💯

@AmblesJambles 10 месяцев назад

Can gravitational waves be lensed? Like what happens to the GWB around supermassive black holes right before they merge?

@kylelochlann5053 10 месяцев назад

Yes, GW follow the same geodesics that light does and are necessarily lensed.

@sudoboat 10 месяцев назад

Is the data public? I would love to build a pulsar delay visualizer from it. Would be interesting to see it in 3D.

@chrisdooph5092 10 месяцев назад

Nice shoutout for Becky and Anton :D

@anderspaulsson 10 месяцев назад

Matt is the coolest guy in space time🤩

@WhitefirePL 10 месяцев назад

Have you noticed this cool thing... The universe shows wave-like behavior on its largest scale (gravitational background, black holes collisions etc) and ALSO on the smallest scale (quantum world, probability waves...) The medium for these waves is not precisely the same (spacetime or "now" for gravity and quantum fields for particles), BUT this wave nature of both relativity-scale and quantum-scale physics seems to be telling us something important. Or is it just my excitement?

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@jerrykrampera8145 10 месяцев назад

The medium /spacetime /quantum /background gravity has long ago been identified as the "AETHER" by Nicola Tesla, for one. It is what a spike of energy we call a photon, perturbs through at the speed of light. When this spike of energy is much higher its actually a particle with mass, a proton ,we call it Matter. a building block of the hydrogen atom. Aether is what connects Spacetime to quantum.

@feynmanschwingere_mc2270 10 месяцев назад

Guess who first came up with the idea of probability waves (in a letter he sent to Max Born)? Rhymes with spine. ; )

@feynmanschwingere_mc2270 10 месяцев назад

@@jerrykrampera8145 Tesla did nothing of the sort. Tesla didn't even understand Relativity. Go look it up.

@WhitefirePL 10 месяцев назад

@@jerrykrampera8145 I think the classical 19th century concept of aether has been disproved, and later, kind of, replaced with 'spacetime'. But it seems that the idea of spacetime is confusing even for hardcore physicists. Perhaps because, in its core, spacetime is more of a mathematical, abstract concept dealing with dimensions, rather than part of real physics (which, intuitively, deals with *things* not with nothing). I'm sure there is an episode about spacetime on PBS Spacetime :).

@BassNinja 10 месяцев назад

I seen dr becky and Anton

@stoatystoat174 6 месяцев назад

I would recomend watching the 'Sixty Symbols - The Gravitational Wave Background' video on this too. Covers some different ground and some of the same points from a slightly different angle. I love PBS Space Time for my space wander news and a reminder that t'internet is a place of learning, not just a bunch of fannies

@iavdortmunder8132 10 месяцев назад

Thanks for the explanation of the grav waves Matt! You bring a great energy and enthusiasm, and I very much appreciate you shouting out my other two favorite channels for this mind-blowing world of science discoveries. The scientists who work on these projects are all amazing and the cutting edge of human intellectual accomplishment and I really can hardly believe the these things they are doing and what they find out, but I love to hear about it!

@alla5578 10 месяцев назад

Could we use the SMBH in combination with Opera One AI to finally playback earth and find out Einstein's last words?

@naimah92 10 месяцев назад

Has there been any consideration of gravitational permeability? And a follow on of that, the idea of gravitational waves being subject to refraction?

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@zacharyalger2302 10 месяцев назад

@@JoshuaRolen why do you repeatedly comment this?

@Manchen50 10 месяцев назад

Thank You.... I sometimes have to watch/listen more than once... But you are spot on my learning curve. Thank You.

@Srikumar_ 10 месяцев назад

I just love that the thumbnail looks like the stellar version of rooks from Everything everywhere all at once

@palpytine 10 месяцев назад

If pulsars are more accurate than even caesium clocks, how can we be so sure of our accuracy in measuring them?

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@garethdean6382 10 месяцев назад

Because the accuracy change caused by gravitational waves is great enough. If I have a cesium clock and a stopwatch, I cannot hope to measure nanosecond changes to the atomic clock. But if I bump it and it skips a few seconds, my stopwatch can see that. To measure the base accuracy of pulsars, we merely need to time it with a bunch of cesium clocks. The cesium clocks and pulsar will 'drift' a certain, random, amount. If the pulsar is totally accurate then it will end up out of step with the clocks by an amount averaging x in a normal distribution. The clocks meanwhile will have drifted from each other MORE since any two clocks will BOTH be drifting, giving twice as much average drift. This allows us to measure something more accurate than our clocks.

@twotheabyss5966 10 месяцев назад

perfectly wrapped up with another Space Time finale 👏

@SunsetGraffiti 9 месяцев назад

So happy to see that shout out to Anton Petrov! He makes great content as well.

@anywallsocket 10 месяцев назад

If you played MassEffect you know the core of the galaxy contains not only a maelstrom of blackholes, but the secret hideout of the Reapers 😳 Lets hope they don’t notice we’ve started listening to them!

@stuartdparnell 10 месяцев назад

And the Leviathans...

@xBINARYGODx 10 месяцев назад

well, it contains both - but the reapers are not really meant to chill there, only a totally thralled species as a form of backup. Also, leviathans don't live there - they hide elsewhere.

@6Twisted 10 месяцев назад

If the whole of the universe is wobbling how much energy is involved?

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@garethdean6382 10 месяцев назад

Quite a lot, a single decent black hole merger can release more energy in its few seconds than all the stars in the observable universe do via light in that same time. Compared to the mass energy in the universe it's quite small, but on human scales gigantic.

@WhiterunGuard11998 10 месяцев назад

Jesus H. Christ, in this video Matt is churning out simple and flawless explanations like chucking tennis balls into the world's largest hole. This man is on another level, there's just no competing with this kind of performance. Just incredible to watch.

@WhiterunGuard11998 10 месяцев назад

Matt just doesn't ever drop the ball and lose the attention with confusion or unclearness. How do you beat someone who doesn't make mistakes? He is too good.

@scholtif 10 месяцев назад

Greetings from Canada and how much do we Owe you? you are better than any Lecture comming out of our Universities,,,,, you should be integrated in our schools, and being very critical of what ends up Payed by Public funds,,,you are one Great Exeption! Bravo!

@davidcerutti8795 10 месяцев назад

One thing that I've been trying to figure out about this is how the rotation of stars in the Milky Way can be discounted, or subtracted from the result. We needed very precise measurements of the movements and masses of planets in our solar system in order to understand the positioning of the earth to do this, and I suppose that these motions are much more significant.

@juliasophical 10 месяцев назад

The orbiting of stars in the Milky Way has no measurable effect on the signal, so there's nothing to subtract here.

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@garethdean6382 10 месяцев назад

We're fortunate in that the orbits of stars in our galaxy are both much weaker sources and much longer wavelengths than what the array needs to detect. Galactic orbits are on the range of hundreds of millions of years. Binary star systems however produce shorter wavelengths that COULD conceivably be detected by LIGO type detectors with a bit more sensitivity than the ones we have.

@benmcelwain5301 10 месяцев назад

Sounds surprisingly similar to the space-time topology described in the discredited pilot wave theory.

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@garethdean6382 10 месяцев назад

In what way? Pilot wave involves a distinct, ordered waveform guiding a particle. This result indicates random, noisy waves moving through space. It's signal vs random noise. It's like saying that a stormy sea is similar to pilot wave theory. I'm not seeing the parallels.

@LordZordid 10 месяцев назад

I always end up with more questions than answers when watching your channel. And I appreciate that. Thank you.

@rxscience9214 10 месяцев назад

There may be other channels that got to this first but only Matt’s voice puts me right to sleep without fail every time ❤

@mraarone 10 месяцев назад

Can we get a breakdown of what might be on the inside of a black hole as if we are disassembling matter down to the Higgs, much like the disassembly of matter at the core of a neutron star?

@gjjkhjkk9241 10 месяцев назад

anti-matter are inside black hole

@JoshuaRolen 10 месяцев назад

Matt has been replaced with an AI, listen to the words closely. The Globalists have faked science!

@morningstarkid07 10 месяцев назад

I am a huge fan of the channel but the AI voice filter in your recent videos is extremely distracting to me. Your audio was already perfect! In this day and age we are all beginning to train our eyes and ears to pick up on what's real vs what's AI generated, and this filter raises my alarm bells unintentionally. Obviously I know you guys are a legit and trustworthy source of information, but it still gives me the creeps.

@JoshuaRolen 10 месяцев назад

Head this missive, listen to the speach closely, Matt has been replaced with an AI

@voxsideres 10 месяцев назад

Love getting a shout out, even if unintended 😅

@marioromano4039 10 месяцев назад

I love pbs spacetime!

@xepher42 10 месяцев назад

I remain in awe of how well your team can communicate extremely complex science concepts. I can watch while sober, and be enlightened. I can watch while drunk and be astonished. But I am never lost! Huzzah!

@tastesawesome 10 месяцев назад

Great video! I definitely learned a lot due to your wonderful teaching and presenting.

@MinoriMirari-fans 10 месяцев назад

My new physics where wrote 5 years ago. I love you professor. Good video.

@TravelGeeq 10 месяцев назад

I love this channel so much. Thank you for always keeping us educated in such a wonderful way.

@user-ii4ex3ff7w 6 месяцев назад

This video is LOVED by Physics students from St. Finian's College Secondary School Mullingar Co. Westmeath Ireland

@fernbedek6302 10 месяцев назад

Cool, Becky and Anton getting shout outs.

@Nefville 10 месяцев назад

You guys have to make a 5Σ shirt or something. Something like "5Σ rock solid certified" or "My standard deviation is 5Σ" no that's not good... anyways PBS Space Time is 1 in 5Σ, keep up the good work!

@XxTheAwokenOnexX 10 месяцев назад

The universe has been surfing on gravitational waves since the big bang 😅👍

@dylanstone1327 10 месяцев назад

Thank you... For this channel

@HumanBeanbag 9 месяцев назад

Shoutout to our host here. He was really difficult to understand when he first started and now he's perfectly clear!

@ZetaFuzzMachine 10 месяцев назад

I'm just here to say that I'm finally a physics graduate! At last, I am able to understand PBS Space Time!!!

@the_unrepentant_anarchist. 10 месяцев назад

Yeah. Sure you are. You *do* realise that this is a *popular science* channel, nothing more, right? And by its very *definition* it doesn't require a Degree in physics to be able to "understand" it. These aren't lectures, they contain nothing of the mathematics required to be able to *understand* the physics involved, to be able to calculate these things for yourself- they are designed to understood by the layman, by people with little or no background in science beyond high school. So why would you need to become a "physics graduate" to be able to understand something that's presented in a manner that's *specifically designed* to be easily understood. Were you made of Neutronium before your "graduation"... 🙄 🍄

@physicsunderstander4958 10 месяцев назад

@@the_unrepentant_anarchist. calm down king, it was a joke. Yes, you don't need to know what a hamiltonian is to be able to watch and enjoy these videos, but there's definitely a level of nuance that will be lost in translation unless you have some additional background knowledge to back it up .

@phobosmoon4643 10 месяцев назад

I've been waiting to see this for weeks, im so excited! It's so cool to see Anton (the bottom of the two youtubers shown at the start) in this video.

@zacharywong483 10 месяцев назад

Superb video, as always!

@fredcloud9668 10 месяцев назад

Really enjoyed your presentation.

@owlredshift 10 месяцев назад

THAT NEW POST Q+A MUSIC, THO

@DouwedeJong 10 месяцев назад

Thanks for explaining and making this video. I learned a lot.

@codyashline4003 10 месяцев назад

The guy swimming while in space with a jet pack got me.

@yuvalne 10 месяцев назад

This is the first time I understood the Hellings-Downs curve! Thanks!

@Nathanhendrickson 10 месяцев назад

I'm loving the weird animation of an astronaut swimming through space

@JoshuaRolen 10 месяцев назад

Listen closely Matt has been replaced with AI

@Elephantine999 10 месяцев назад

Great description of a complicated story. Thanks for making the science accessible to non-specialists! :)

@jestermoon 10 месяцев назад

Take A Moment My dear Proffeser Waves and water is a great analogy Nice mate. Keep Looking Up Stay Safe and Stay Free

@amanjain4817 10 месяцев назад

That "pair of pulsars" at 9:52 had some real emotional depth behind it

@markhuebner7580 10 месяцев назад

Awesome! 15 years well spent, thanks!

@ziumzium5049 10 месяцев назад

Kudos for giving shoutout to the two other astrophysics communicators that i tegularly watch! It's great seeing people not seeing others in the field as competition but as colleges and linking to their videos as well.