I have a book on anti gravity, I can’t put it down

Oh he even got a mom joke in😂

That was the funniest "yo mama" joke ever, just cause it came from you of all people. I am still laughing a minute later

I came to get info but ended up getting roasted

Why doesn’t gravity work herf?

Road runner + anvil + gravity = Flattened coyote.

1:22 The seldom-seen, often-feared Simon burn.

Did not have Simon making a your mom joke on my bingo card for this year... That was great. Thanks for the laugh

In case anyone is curious about the wood engraving at 1:00 It is (old) German and here is the translation (ChatGPT): Doctor Zirkel (Zirkel is compass I believe) [1st picture:] From the study's stuffy air, Dr. Zirkel steps into the morning fair. [2nd:] Mr. Zirkel strolls to and fro, His head heavy with ideas that grow. [3rd:] Suddenly he sees with great desire A ripe apple hanging higher. [4th:] Dr. Zirkel thinks: now would be Quite pleasant the effect of gravity! [5th:] And lo, not a minute does flee, When from the tree he sees the apple free. [6th:] How great from the tree the distance is, The doctor measures with his compass. [7th:] Once his thirst for knowledge is satisfied, He decides not to let the apple be denied. [8th:] Though the process isn't fully clear, Suddenly it becomes perfectly dear. [9th:] A new law of nature in space unfurls: "The apple doesn’t fall far from the tree!!!"

Another thing with Gravity, GPS has to take account of time dilation for both Special and General Relativity otherwise the accuracy would drift away rather quickly by about 2km per day.

Gravity: Just when I thought I was out, ... pull me back in!

Correction: The strength of gravity isn't stronger in the center of a planet. It is in fact zero there. Inside a homogeneous sphere, the gravity is linear to the distance from the center.

Time dilation makes it so that even if you could somehow get out of a black hole, the universe would be over.

Thats what id say if i accidentally got caught in the event horizon of a singularity..... Whoopsy daisy!! 😂😂

Thats the thing that genuinely mesmerises me with space is that any question you may possibly answer will only lead to a thousand more questions , something we will never understand or truly comprehend its creepy but amazing at the same time, also the size of it is just ridiculous when you stop to think how truly meaningless and insignificant we are in the grand scheme when not even our solar system would be a grain of sand in the ocean

“Do you hear that Mr. Anderson? That is the sound of inevitability.”

I once escaped from a black hole riding on a gravitational wave. They said it was impossible! I told them I didn't have time to explain. =].

"Gravity doesn't work herf" is how i read the thumbnail

E = mc^2 is not complete BTW. It is actually E^2 = (mc^2)^2 + p^2c^2 to account for massless particles.

“Maybe yah Mum does!” 😂

This was a great one Mr. Whistler, keep em coming!

Great job on this one Simon🙏🏻

The plane analogy stops being intuitive as soon as someone asks "but what if the plane is stationary?"

0:35 - Chapter 1 - It's not exactly a force 5:05 - Chapter 2 - Our theories fall apart at the quantum level 7:45 - Chapter 3 - It's also limited by the speed of light 12:20 - Chapter 4 - Gravity warps the passage of time 15:45 - Chapter 5 - It is most extreme in black holes

This is excellent. One of your best.

The young picture of Einstein makes him look like he sells tweed covered furniture. Everything plaid.

Fun fact: The ends of the LIGO arms are built up slightly higher than the surrounding landscape, because they had to be so straight, that they had to account for the curvature of the Earth.

The Zeno Effect. That and Bell's Inequalities. Really are blowing my mind. Then, of course you have Negative Energy, Entanglement, Vacuum Energy, QCD, QED, Field Theory, Tensors, Scalars, Hilbert Spaces, Time Dilation, Antimatter and on and on. You all are cray cray, and I love you.

"Entropy" next ?

Have a good weekend everybody!

Nicely done video Simon. The is one the best written/edited you’ve done and in a challenging topic.

Hey writers! Super awkward timing (I know the time between script and release is delayed) but the “radiation” or light only black hole was just proven impossible in a paper released I think exactly a week ago, maybe 2 weeks ago. I’m not 100% certain if it was peer-reviewed yet but.. just so you know haha. Honestly with how much crazy space stuff has been figured out this year it can probably be a “10 discoveries this year (plus some corrections) video

Gravity is a cruel mistress. God forgives, gravity abstains.

Great video, Simon!

The mom joke caught me off guard and now i have to wipe coffe off of my phone.😂😂😂

Ahhh... >raises finger< Your path may lead toward the singularity (there is evidence that the singularity can be orbited or bypassed) but it does NOT end with you MEETING the singularity. Space trades places with time and so the singularity remains forever IN YOUR FUTURE.

Does this guy ever stop making KZfaq videos. Like wtf.

1:05 is the beginning of the sickest burn ever 😂😂

Brilliant work. Thanks! Geaux Louisiana.

A wise man said "Time is an illusion, lunch time doubly so..." It's a shame he passed away (Sort of ironic too)

Best use of a Mom Joke in years...

Recently, new thinking has forged a link between Quantum Field Theory and General Relativity: the Higgs Field. The Higgs Field is (supposedly) responsible for the rest masses of the elementary particles. However, the ONLY definition of rest mass is the resistance to acceleration, and acceleration is defined entirely by General Relativity since it determines the Metric Tensor which defines local inertial frames.

I have never heard time dilation explained so simply and clearly.

The concept of gravity altering time is best summed up in the movie "Interstellar" (2014) with Matthew McConaughey. That movie spawned several scientific papers that won some notable prizes and were proved to be correct. It's amazing, especially if you like science and astrophysics to be specific.

Woooooo science

Gravity is ridiculously weak. The fact that a human being can stand up and even jump with the entire earth's worth of Gravity pulling on you shows how weak it is.

I like all your videos but this was the most thought provoking one ever, thanks.

That was heavy. Thanks for enlightening us.

Gravity doesn't work herf

Thanks for a great explanatory video!

That 'ur mum' joke really brought me back down to earth

I’d be interested in you making a video about Penrose’s black hole singularity theory and Kerr’s paper in response to that theory. Theories and ideas about the nature of black holes, geodesics, and singularities are fascinating and the work of Penrose and Kerr are equally so.

I may not understand Gravity, but... it just works

Let's face it, nobody fully understands how gravity works. Even Einstein's theory of relativity describes how gravity works, but not why. There must be (possibly quantum) mechanism, just saying it distorts spacetime is a fudge- how does it actually do so? It doesn't happen by magic.

Well this little video just cost me 57 years

Thanks Nomis, great video, mind blown again, go to love science 👌

They forget to show the rotational curve on illustrations, heavy objects that have spin will also spin space time which is why you can’t go in a straight line into a black hole, you’re forced into moving along space time which is nearly infinitely curved at the event horizon

Damn Simon, I wasn't ready for that 😂

I really didn't understand any of this but, found it incredibly interesting. Thanks, @Simon Whistler.

Space itself can travel faster than light. The seemingly ever increasing expansion. And entanglement seems to be instant and ever present.

I was a few days behind in viewing my favorite KZfaq content. I made my tea, grabbed a couple lemon cookies I'd made earlier in the day, turned on the TV and up popped "GRAVITY DOESN'T WORK HERF". I was trying my best to figure out what HERF meant (thinking it an unfamiliar acronym). Heavy Earthen Radial Fixtures? Then it hit me, I almost spilled my tea laughing at myself. As always, wonderful, well researched and well-presented content that is much appreciated.

On a k hole trip felt like I was in a black hole falling through space time. Kinda cool and scary at the same time

enjoyed this one

Two recent papers have shown quite well that one CANNOT make a black hole out of photons.

Gravity is a *side* project now? Settin' that bar pretty high ...

Thank you for the Your Mum joke. Feeling a bit down today and that made me laugh stupidly. 🤣

I noticed two mistakes. The gravitational pull weakens as we go deeper inside the planet. It reaches 0 in the centre of any planet. Second is that when we replace the Sun with a black hole it will suck all the planets, unless they start rotating much faster which would be noticeable by observers on the surface of the planets.

I like to think of black holes like a spinning record or platter, where the outer diameter is moving faster than the speed of light by a lot and everything within is slower linearly. The Event Horizon is a little further out and due to gravitational 'drag' is moving at light speed only!

Excellent

Isaac Asimov wrote an essay once about gravitational effects that caused scientists to consider the possibility of the "planet" Vulcan orbiting inside the orbit of Mercury. It was presented in a discussion of historical coincidences, but the final explanation was that the Sun's energy density was the source of the observed gravitation effects. It's an interesting read, if you can find it now.

Entertaining and educational

Those glasses accentuating your skull, Simon! 😁

Something gives me sleepless nights: How did they manage to equate the lengths of both laser arms at LIGO with such accuracy? Need an episode on that

I recently saw an experiment with coherent light in a fluid medium which showed photons slowed down to a visible pulse. I do not remember where this study took place but it was in the USA.

About time dilation with proximity to large masses, a simple way to describe it would be that for light to get trapped in a black hole, the speed for light to leave must be faster than the speed at which the light is falling inside. So your speed relative to the speed of light gets closer together creating a similar effect as travelling close to the speed of light. I know it's not scientifically correct, but easier to understand if you accepted that part with time dilation due to traveling at speeds close to the speed of light in a vacuum.

I think about Roger Penrose and how he said as a perticles speed increases, it's time slows. What if there is nothing beyond the even horizon, all particles falling in would accelerate to zero or near zero time. (Relative to all of us outside observers).

Black holes only from light seem to be disproven (or at least cast into doubt) by a recent paper on such 'Kugelblitz' black holes (due to Schwinger effect causing matter/antimatter pairs to be created before the energy density becomes sufficiently large for a 'photon energy hole' to form)

It's also interesting to note that when time stops at the speed of light the space between you and any destination also shrinks to zero. There is no distinction between taking zero time to travel a certain distance and it taking no time because no distance existed to begin with. Essentially at the speed of light you are already there from your own perspective. It's weird that the size and shape of the universe depends on the perspective you observe it from. It makes me wonder if anything else changes like physical laws or constants. It could be that we can't answer some questions because we are assuming that the laws we use to find the answers have always been the same.

DEEP, but well presented - now if you find a way to stop my head from spinning, please!

The gravitational pull near the centre of the earth is actually much smaller than on or near the surface, so the core should age more quickly, not slower.

Astronaught; moves 1 cm The Event Horizon: that a move that you won't be able to financially recover from

There is a great video showing you what you will see if "pass" through a black hole (if you are somehow not affected by its gravity). Essentially it is the same effect as your field of view angle approach 360 degrees. As the field of view increase more of your surrounding fits the center of view. At some point your field of view goes "beyond" your surroundings where there is nothing. As you approach 360 degrees, all your surroundings (what's behind and in front of you) collapse into a single point at the center of your vision. That is you can see the entire universe in a single point surrounded by the void. At the event horizon, every direction everywhere is the black hole and the entire universe is a single point in your view (a point has size of zero).

@sideprojects, the second LIGO in the U.S. is located in Oregon, now Washington State :). Thank you for sharing this interesting topic!!

Your description of Ligo and gravitational waves is great! However you equated the theoretical emission of graviton particles (which we’re still nowhere near able to detect) with gravitational waves. Gravitational waves are oscillations in spacetime, not graviton emissions.

Gotta hand it to you, Simon. This was a really accurate and researched explanation. Few KZfaqrs other than dedicated science creators get it this right.

I believe the analogy of a planet moving through space to that of a heavy ball on a trampoline is misleading. The ball on the trampoline is affecting one plane only, whereas a planet has an infinite number of planes surrounding it in all directions.

"gravity isn't exactly a force" ---> "gravity isn't a force, period, full stop"

16:41 you meant to say "any other object of that mass", because since obviously densities differ, if a black hole of the same size as the sun replaced it, the solar system would very much collapse, as the black hole is so dense the gravitational pull on the other objects would be extraordinarily bigger.

Most confusing part: gravity is the weakest of the four major forces, yet nothing is able to escape a black hole which is essentially a gravity well.

KZfaq gets Simon burnout

The singularity says, "You can't win. I have the low ground." The singularity says, "I'm inevitable." The singularity says, "Resistance is futile."

Simon Whistler is the only presenter I know of who can encrypt speech simply by the speed at which he delivers it.

Joke's on you, I don't know way more than five things about gravity. I just know that an actor needs it to be taken seriously.

4:30 light made blackhole used to be theoretically possible, but I believe a recent paper said that it's so unstable that it basically doesn't exist

In another vid I watched, there was a weird discussion that if nothing goes faster than the speed of light - but working out orbitals you always assume gravity is instantaneous- start adding in any delays won't work...like an aircraft flying over the sound lags behind - so the source of gravity should look like it lags but it doesn't work....did my brain in..

After passing the event horizon spacetime becomes timespace, you aren’t moving in space, you move in time and time only moves in a straight line and that line goes straight to the singularity

4:54i can see Simon reading that quote snd being like idk wtf i just read this whole chapter. Also i can see him doing the same at the end of this whole video

Another way to put it: "Once you pass the event horizon you can't exceed the 'speed' of causality". Your future only has one inexorable direction and all other possibilities are cut off.

This was interesting and detailed, thanks. A clarification is that escape velocity from objects has to do with distance from object as well as the mass of the object. Earth, for instance, has an escape velocity from the surface that. you shared, but from the moon's distance away, it requires less velocity.

Thanos: I am inevitable Black hole: here, hold my photons.