Carolin Crawford is awesome and so are her lectures.

I am realy EVIOUS of the people who are in their teens right now that they have all that PROFESSIONAL material at their disposal and only a click away. I started school in the 1983 in the Soviet block (Hungary) and it was the DECAY of that system and you can imagin what "QUALITY" EDUCATION that could have been. And after that came middle school in the early 1990-s whitch was even more confusing and more degraded. I always had an intrest in astronomy and sciences in general but at that time the BIG DISCOVERIES were years away. So the current students should be VERY THANKFUL for such opportunities.

I love the way she says.... "I have to show you at least one graph 'so that you can say you have been at a science lecture'". Brilliant lecture!

My gratitude to Caroline. In my opinion seeing more women and ethnic groups in this field is great. It is a way forward to make the world a better place.

Awesome lecture as usual. I really appreciate the way you offer nonstop enthusiastic info during your talks!

Best lecturer in astrophysics on the WEB.

Di Vaz, this whole lecture goes towards explaining why things spin. Once momentum in one direction starts it will not stop unless force is applied in the opposing direction. Under gravity everything spins because of forces applied to each side of the matter

It helps me to think of angular moment as essentially an extension of linear momentum. Objects travel through the universe in straight lines if unperturbed by external forces. Each mass particle in a rotating system is perturbed by a force perpendicular to it's path of motion, thereby preserving the magnitude of linear momentum |m*v| of each mass particle. This conservation of linear momentum of each mass particle yields many of the phenomena seen in rotating systems such as cons of ang. mom.

Clouds spin. Shrink. Spin faster. Stars and planets. Angular momentum. This is fascinating stuff!

I have a functioning fusion generator for the energy I need for my time travel machine. Should be finished with the quantum phase emitter array with the braydon particle focusing ring. The easiest to manufacture was the Ekypirotic EPR Luxen inhibitor. I still need the Chronon Decoherence Wave Platform which is a 4 meter by 4 meter square approximately 4CM thick pure platinum.

This is quite the lecture about the motion of heavenly bodies. It was helpful to reference for the calculations I'm working on.

Good lectures, don't have to agree with everything. She is one of science types who start their lectures with the word "so''.

I love the Accent, she sounds like a REAL PROFESSOR!

Really nice lecture. Thanks for making it.

wonderful lecture, thank you

Awesome lecture! I thought I knew a fair bit of space related facts but I learnt a lot here. Ever wondered how you can tell if an exoplanet is orbiting retrograde? She tells you how... and a lot more besides.

How come no one has said, "my head is spinning" yet?

I was hoping for more discussion about the way energy gets distributed between the heat and pressure within the material of a rotating body and the turbulent motion of waves and currents moving around the body as well as the rotation. It seems to be an assumption that rotational momentum is something separate and isolated from turbulent wave motion and currents within a rotating body, but this is unlikely. It's more likely that turbulence gradually harmonizes into monodirectional flows, which harmonize into unified rotation. Likewise, the turbulent currents and waves within a body are largely emergent from energetic processes at the molecular level, such as climatological phenomena on Earth. Likewise, the temperature of the materials making up the body are responsible for their relative densities and pressures. We might take it for granted on Earth that all the water is liquid and the molten core is not a hot cloud of vapor, but in the gas giants, there is probably a core that contains liquid and solid portions of the same substances that make up the atmosphere in gaseous form. So, for example, if Jupiter contained less energy and was therefore less turbulent and cooler, more of its gaseous atmosphere would likely collapse into liquid oceans or solidity within the core. This would presumably cause Jupiter's gas atmosphere to shrink, which would cause it to spin up. But what would a cooler but faster-spinning Jupiter do in terms of gravitational effects within the core? Would the increased spin produce a centrifuge effect that would counteract gravitation, for example? If so, would that mean that further radiation of energy out of the planet would gradually result in slower rotation, which in turn would increase the gravitation measured at the surface? Finally, isn't it short-sighted to assume that all the material of a galaxy is moving because it's being pulled inward toward the center? After all, the cloud from which the galaxy is condensing contained energy and also possibly angular momentum as a cloud. While the internal gravitational dynamics of the galaxy may change as it goes from being a more dispersed cloud to a more defined galaxy of stars and other condensed bodies, why would you expect the momentum of those condensing bodies to cause them to fly off away from the galaxy's center? After all, if they were more or less stabilized into a position within the unified galactic cloud and rotating as such, would they not maintain their relative position throughout processes of star-formation? The invisible 'dark matter' is more than likely nothing more than regular matter that has become so accelerated and energetic as galactic clouds separated away from each other that the particles are no longer able to settle into subatomic and molecular positions that would be capable of emitting, reflecting, or refracting/diffracting light. Nevertheless they contain energy and the potential for force-interactions so they must remain part of the galaxy's conglomerate mass and angular momentum/inertia.

a spinning wheel in space is only quantitatively different from a planet or a small satellite but the gravitational effect is just as real. Today we talk about dark matter or dark energy to describe the galaxies or clusters of galaxies and their iterations that nor classical Newton neither Einstein's relativity can explain in full. Three centuries after the death of the great Newton gravity is still a crucial challenge for physics and the understanding of the universe.

It is actually an up/down direction, however, a left/right, forward/back would work just fine aswell. Remember there is basically no drag in space, and there is no effect from the whole system moving in any direction. kind of like if you are in a car and spin something horizontally on your finger, you would not expect it to crash into your finger as it comes around in front of you. The car's current speed does not affect the inside of the car. (except for bumps in the road :P)

Go to Los Vegas, watch the roulette wheel, and you'll understand that (despite the appearance) the result of the "big bang" is asymmetric. Conservation of angular momentum is everything in space.

About exoplanets in retrograde orbit relative to the rotation of the star: How likely is it that a planet's orbital plane is not fixed relative to the star's rotational axis? That way, our observation of a retrograde orbit would simply be a consequence of the orbit's position relative to the star's rotational axis at the time of observation?

Nice, this answered a lot of my questions.

For Einstein gravity is the property of matter to warp space time, today we have loop quantum gravity, string theory and more. The problem of gravity in physics is very complex and far from being solved in a definitive way the mass certainly plays a role (even kids know this by now) but it does not answer all the questions. Even the energy exerts a significant role in gravitational relativity. The movement of a mass creates a curvature in space time from this point of view

Oh, what a wonderful talk

And sharing it for free.

My question: is the universe rotating? I know this is quite a fundamental topic in today's physics wich involves relativity, strings theory, and possible time travel eventually. Also is gravity due to the cosmology effect of rotation? and last why everithing rotate? I would much appreciate if you could do a video on such topics. Thanks Professor Crawford

In addition, one of the ways proposed by scientists (including the well-known A.Clarcke) to produce a simulated gravity onboard spaceships is just to create an artificial rotation, which means that rotation creates gravity, and this is a proof of what I am saying.

So why do moons/stars spin backwards creating an angular problem?

To my understatement there is not a single object in the universe which is not rotating so how can you scientifically exclude this possibility? Some physicists have also postulated the existence of a particle called a "graviton" but to date there has been no evidence about that.The fact that Newton in his equations colleagues the amount of mass to gravity is only one way to measure it and not an explanation of why it is acting,or either why objects all rotate, and propelled by what force.

" to stubbornly suppose you know is to be arrogant" in that you are correct, perhaps turn the mirror of truth upon yourself

When calculating the mass of any black hole, are there corrections applied to take account of the gravitational time dilation field around the hole? How do you "home in" on the correct value of the mass, if when mass is bigger, the time dilation is greater and so the speeds are affected to a greater extent which causes the real Newtonian speed to become even more distorted on observation? I suspect we could take any value of mass and with the varying time dilation effects, a change in mass would make no difference to our calculated value. In other words, I don't think we have a clue about the mass of any observed black hole. Except we do know the real, Newtonian speed of the Earth system around the Milky Way. This is the ONLY observed speed which can be relied upon NOT to be distorted by time dilation and so THIS speed should be used to calculate the black hole's mass. What do we use at the moment?

at what point does a mass register in the mesh of time and space? and when you're not at that needed weight does that mass fall or pull away or what? anybody?

Why do things spin? What is always was. Spinning will survive and a simple stop will stop what you see

gravity is constant movement in space is relative remember. so i the earth am x distance from the sun and i fall towards it.. i also and rotating around it at the same speed as I fall meaning that as i fall one step towards i move one step around (i think actually there is probably a relativity between 2 speeds for this to work but this is how it works) or better as i spin away from the sun,, im pulled back towards it by its gravity. so the suns movement pulls the system with it across space

uhhh, I don't even know where to begin... 1st of all there was nothing biblical or dogmatic about anything I said, second, I'm not willing to have an argument about whether mass causes gravity. Just like I'm not willing to have a discussion about whether or not daylight is from the sun. Seriously tho, love the enthusiasm, have fun learning about the universe :D

Isaac Newton in his main work Philosophiae Naturalis Principia Mathematica, 1687, in Book I defines the centripetal force: "The centripetal force is the force the effect of which (the body) the bodies are attracted to, or are pushed, or otherwise tend towards a certain point as to a center. Of this kind is the gravity, the effect of which bodies tend to the center of the earth, [...]

thankyou Professor Carolin Crawford i listen to your whole playlist at nite love you topics thanks

thank you so much

was it the spin rate of the Black hole from within the black hole or outside the gravity of the black hole?

19.35 yeah er I want safe space travel suits even open top orbital cruises eventually. Angular momentum and particle diffusion may keep us safe from solar wind. Micro furry paint? Anyway really enjoyed. Thanks

At 20:45 it is shown the classical diagram of the solar system,sun in the middle planets orbiting around.If this diagram were accurate,what direction would the sun be traveling:in a left,right,forward or backward manner?or more of an up/down manner?I am just trying to picture,because if it were a left,right etc.(lateral) way,with the planets actually orbiting like saturns rings,Im wondering,if gravity is attractive,why doesnt the planet collide when starting to pass in front of the suns path.

Bewdy Carolin, goo donya.

As things move toward the center the angular momentum increases (the ice skater with folded arms), but the sun has only 2% of the angular momentum in the solar system. Go science!

I wish I went to Gresham College

See work by Ernst Mach - and how it was further developed by Einstein and others.

I love your enthusiasm, but alas, gravity is due to mass, not rotation. Just because you can simulate gravity does not mean the method you used to simulate it is the same phenomena that is actually responsible for the real thing. ex: flashlights simulate sunlight, therefore the sun is powered by double A batteries.

Man! those things are HUGE!!..;)

Who is she talking to who would understand and appreciate the subject...yet needs to be "introduced" to angular momentum?

Why should I accept your assertion without explanation as a scientific fact better than mine?

The Equation of Time explains the "mean" in Greenwich Mean Time. Those of us old enough to pre-date GPS and use a sextant for navigation had to correct using the Equation of Time to find out our exact latitude with the "noonday" site which could vary by quite a few minutes from clock-time midday at our longitude.

You really want to know why things rotate? Look into fluid dynamics.

50:31 If 9/10th of the matter is *outside* the visible galaxy, why aren't the outer stars tugged out of the galaxy and towards the dark matter halo?

18:05 For all of your big tory dustus needs.

This rules

Thank you dear friend at least this is now the kind of "logical" and "academic" answer I was looking for. Now I hope the debate can seriously start, therefore my question is if I can "simulate" a physical phenomenon as you stated how can you demonstrate that my is a simulation and your hypothesis (mass) the serious staff. I can put things the other way round and you must make a demonstration which you didn't so far. Give me a scientifically demonstration please not biblical dogmas thanks.

so electromagnetism, a strong force, has nothing to do with spin or rotation any where in our universe except in our ceiling fans ?

I’m disappointed. Ms Crawford explains, quite well I may add, how things spin (or rotate). I was interested in finding WHY they do. From galaxies to atoms, everything in the universe is spinning since day one. Why are they spinning at all? And what keeps them spinning, why are they not slowing down? Inquiring minds want to know.

I would like to propose a new law of physics, which I will call the idiot law. "The arrogance (A) and ignorance (I) are always directly proportional within the idiot" So that Y = AI (Here Ai is not the acronym for artificial intelligence but a measure of human idiocy as the second most common substance in the universe we known immediately after the hydrogen)

one curse I need cured is the mirror ages me and my hands will shrink

Sagnacs experiment. Is she telling the truth, or fibbing a little?

"Collisions" is the apparent effect of Quantum Information Integration of the general field. (?)

Amazing lecture. It could be better if audience was better

My argument was not broken at all Mr I am right this is not arrogance I demonstrate the physical principle which you did not know about. You did not know about centrifugal and centripetal force. You did not know about nasa spacecraft designed in the 60 applying that principle and Clarck You don't know quite a few things To know things is to be educated, to stubbornly suppose you know is to be arrogant. Anyway nothing personal but sometimes just ask yourself is there something I'm missing maybe?

Ain't that the truth.

It would be much more serious and realistic if you'd say you don't n know. We calculate the gravity based on mass (because as Newton taught us), but we do not know from where gravity emerge really . Is it not so? Newton in his writings at least had the intellectual courage to admit it, while you pretend nothing has happened today. Nice way of doing science I like that

"You are an idiot and your sister also" A comment you posted and then deleted out of shame. Who is the rude person again?

I want to see the earth moving in real-time why can't I

ok

Gravity is NOT due to rotation

And again you make assumptions, THAT is what makes YOU arrogant. You assume that i don't have an advanced understanding of physics and you are wrong. Just because i have no interest in explaining to you, as i would a child, why you are wrong does not mean that you are right. Perhaps you could name and post a reference to the spaceship "designed by NASA" in the 60's...

great lecture , kind of got dizzy at the end there :) QC

you do not know what couse the rotation. just making asumtion and repeating convensionaly accepted models based on your exampl models. It is sade. I watch these vidios but dont see anything new bsed on facts.

Dear Sir I have already expressed my views and scientific evidence on that you seems not able to understand correctly. I'm not your tutor and don't have to explain anything to rude and unpleasant persons like you. This discussion no longer makes sense and please do not further interact with me since you are not motivated to a correct discussion looking for a scientific truth but you are only guided by personal resentment and personal problems that do not concern me.

nice

11:40 Rotating star.

Why our moon does not spin?

revolving on axes?

If you want to talk about physic study the basics first. Buy some good books (not Wikipedia) and study the ABC, you and people like you are just arrogant and offensive, but I have what it takes for you don't worry. If you need more just call me

Who should I talk to the Wikipedia Websites? I want to revise a true logical. Because all the theory of all Physicists in Earth have wrong theory why all planets revolves around the sun which they've got all the answers theory's wrong. They all didn't know. I have the true logical answers why. I know why the Galaxy and all stars why they are together relatively properly revolve to their orbital lines. The children grew up and at present were not correctly taught. For Christ sake. It makes my pin head spin.

You have expressed your views but shown no evidence. You are unable to corroborate any of your ideas, unable to back up of your statements and are entirely unable to understand the principles that are discussed in the video we are commenting under. You also use such terms as "scientific truth"science deals with facts, not truth. If you want truth watch a philosophy lecture or go to church.

Axes is pronounces "axe ease" plural of axis.

uh... lol k

my perfect woman i wonder does she like music too :)

Thank you for the scientific demonstration. Is that all you have to say? This is not biblical? have fun say stupid non scientific things too. You are assuming that mass cause gravitation but you can't demonstrate it. Very nice a good way to make science in 2013. Can you at least tell me what is the difference between you and a medieval sorcerer because this is not science this is religion and of the worst kind. Thank you sir

She can't promise she can keep rotation separate from revolution? Why is she giving the lecture?

I am going to guess that Carolin voted against brexit. I would guess she is a first born. I would guess she is a mother. I would guess she is divorced.