Physics 10 - Lecture 24: Universe I

[JRabba1995]

viva chile mierdaaa

[skepticalinquier]

And the world is carried through space on the back of a great elephant.

[stewitr]

I just ordered the book 'Surely you're joking Mr Feynman' after Prof Muller's recommendation.

[Hollywood1898]

Did he die?

[NikolaGrobar]

What's a boson? :)

[FallofDarkness55]

@NikolaGrobar a boson is usually a messenger particle with spin-1. A messenger particle is usually a particle associated with three of the four forces i.e. EM, Strong, and Weak. The bosons for those forces respectively are called photons, gluons, and the W & Z bosons. If gravity had a boson it would have spin-2 and it would be called a graviton. Quantum gravity is a theoretical concept. When unified with the other forces, that's when superstring theory emerges.

[NikolaGrobar]

@FallofDarkness55 Thanks mate. I know they are supposed to find it in that accelerator in mountains, or something like that...

[NikolaGrobar]

Fantastic professor!!!

[masegta1]

he might not be the best astronomy teacher, since there isnt 10billion stars in our galaxy, theres axtually 400 billion, and theres up2 1 trillion in the andromeda galaxy not also 10 billion as he said, but all his other lectures were really great.

[bessalle]

ESOOO!! VIVA CHILE MIERDA!!

[FallofDarkness55]

Great lectures! By the way, this guy kind of looks like Einstein.

[tallbrowneyes]

I smile when a scientist teacher casually says "It turns out..." to gloss over the years or decades of research it took to bring us this information. I'm grateful for what science has done for us.

[glupsamja]

future president of USA? what?

[nckcanna]

Has anyone used the CC transcribe Audio... the things it comes up with are helarius lmao!

[HeyHeyHarmonicaLuke]

:D cool richard muller is a carl sagan fan!!!

[Mirid]

just putting it out there that the caption can be quite sucky at times. For instance Hawking radiation = "talking radiation"

[BroArmoDillo]

Is this a higher level physics course?

[slovakmath]

@BroArmoDillo this is a class for everyone, but mostly business majors, political science majors, etc. people who will probably never in the rest of their lives even consider physics, in its deepest sense, again, end up signing up for it. The purpose of the class is to educate the youth who could possibly become a US president in the future, to hopefully make the president aware of basic concepts of science and physics so as to be able to spend money properly ... basically

[mdo686]

The reason tsunami`s are called harbour waves is because that is where the damage occurs. Fisherman out at sea would not notice the tsunami but upon returning to the harbour they would find it destroyed, so they called it a harbour wave.

[XmegaPresident]

There are MUCH more the 10 billion stars in our galaxy!!!

Several other reliable sources clearly state 250-400 billion stars within the Milky Way Galaxy.

[KoningStoma]

And the Andromeda galaxy has about one trillion stars. This lecture may be a bit outdated. Its from 2006.

[evangrogers]

i'm pretty sure that the binding energy is actually BE= Gmm / r'squared. I might be missing something, but the gravitational force works in all directions, so it must be squared.

[zynot91210]

By that logic it should be cubed.

[desnouck8]

force is r², energy is r

[roniepao]

is he the best physics teacher in america?

[bowmhoust]

How do you want to measure that?

[roniepao]

by the amount of his salary i guess.

[abaddon1112]

well, all I know is I wish I had the money to have a seat in that class..  He's somebody I could learn from.

[glupsamja]

@abaddon1112 yeah, he is a really great professor

[glupsamja]

is this professor still teaching??

[AtheistCentre]

LOL at 6:20

6 x 1000 = 5000

Who'd have thunk ;)

[royswinkels]

I've had this thought for a long time now:

Why isn't "size" considered as a Dimension?

-We can go infinity Left,Right Up,Down For-,Backward.

-We "travel" infinity forward, and can "see" backwards trough Time. (4th, or whatever, Dimension)

-But we can also "see" infinity in and out. (Bigger'nBigger, and Smaller'nSmaller.)

Carl Segan Showed in his awesome "Cosmos" that a 3D Projection of a 4D cube looks like a cube within a cube.

I love to hear what you think.

[welhungjohnson]

Sagan was a hack.

[bagthesecond]

Agreed. I could flip through a dictionary with my eyes closed, pick about a dozen words at random and form a better theory with said words than this guy.

[HeyHeyHarmonicaLuke]

i had to read your comment a few times :P

i love that Carl Sagan movie about tessaracts and flatland!

your asking why isn't size a dimension because you can zoom a microscope in on things just like you can zoom your telescope in any direction of choice,

I've head dimensions defined as a 'degree of freedom'

a direction in which a particle can move

so although we can imagine zooming in on a particle, that's not a direction the particle can move in

[BenG549]

If you asking why isn't size considered a dimension is that not because size is measured in dimension? an object runs x distance latitudinally, x distance longitudinally and x distance along the axis of altitude. if your locating an event you will measure where it is i.e along the latitude longitude and altitude axis' and then when it was (time) in that sense time is the fourth dimension of measurement but only in that you are using it to define an event. does that even make sense lol?

[chernobila]

should not it be r^2 at the binding equation?

[paulb1989]

Nah, it's "r[squared]" in the force equation. It's just "r" for the potential energy.

[chernobila]

Thanks you very much, I figured that little late when he put that 2 above that fraction and said that "r" was defined funny way.

How about stars? when he said that its 10x10^9 stars in milky way? its more like 200x10^9 to 400x10^9?

[jacksonwalters]

The r^2 is the equation for force. You get the potential energy by integrating the force from r to infinity, thus going from r^2 to just r.

The 2 being defined in the "funny way" probably has to do with the fact that the radius is related to the event horizon in a black hole, not the center of mass, but I'm not sure.

[chernobila]

thanks for details.

but how about the number of the stars? is not he little short on that number?

thanks again

[DanC9189]

i really like these lectures but they are a little basic

[quarkphotonect]

Absolutely true

thanks for saying

Im 13 and there quite basic especialy the one on radioactivity.

[arseymcpherson]

Is there one for grammar?

[quarkphotonect]

What You Trying to say?

[HeyHeyHarmonicaLuke]

grammar for future presidents class

[quarkphotonect]

Ohh lol!!!!

[chernobila]

hey if you find anything more advance please let me know ok? I am on hunt for this lectures. No money to go to school so got to learn from here

thanks again

[DanC9189]

MIT and Stanford both have lectures on youtube, you could check them out. One thing you should try is emailing a university and see if they will give you their reading list for what ever subject. You end up spending most of your time reading books and journals anyway, well i do might be different in the US, so you will learn the same amount.

[archaedemos]

check out my Light is a wave video and post a comment ! (:

[landin048]

Prof. Muller explains things in wonderfully relatable relative terms. He's great.

[landin048]

Dude. You don't have enough to do. Have you ever looked up the word "zealot"?

[anomnomnom1]

No, gravity is a fact of reality. Reality, in the words of Phillip K. Dick, is that which when you stop believing in it doesn't go away.

So try it. Stop believing in gravity, and then walk off something tall. See what happens.

Obviously in the seconds immediately after you attempt this experiment, you will find that your disbelief did not exempt you from natural law, and then nothing.

This is the difference between your faith and reality. Gravity is part of reality. It doesn't go away.

[dkcnebula]

Gravity is a very real thing. You do have a very interesting standpoint, but I think you're confusing a characteristic that is developed by society with a similarity between a real force. Interestingly enough, you can find these parallels almost everywhere in human interaction and existence. For example, if you examine what "justice" is for a human, it's merely a need for balance. These kind of things were probably passed onto us from our star ancestors. Life IS nature's perception.

[VelociralexBojarzin]

"Gravity is nothing more than influence".

That means Gravity = the chuch.

[VelociralexBojarzin]

of course, I meant church*

[jchav981]

No, physics does not understand the "why". Why is not important in physics. Physics is a study of "how."

[landin048]

Um...you can't control me because I think for myself. Give it up.

[chernobila]

Andromeda has more then 10 billion stars. it more like 400 billion

[dkcnebula]

First off, galaxy means milk, not Greece. Secondly, what you call "instinct" is simply the characteristics of the chemicals we are created by, coupled with millions of years of evolutionary habits. Thirdly, your misconception that the truth should be easy to find is false. The reality we live in is infinitely complex, and will not be found by anything but rigorous study and experimentation. SCIENCE is the only real truth, and refusal to believe what reality tells us is bordering denial.

[dkcnebula]

If you had any understanding of quantum physics you would understand that the obvious is only an illusion simplified by our perception. When you get to what nitty-gritty of what reality is crafted by, you realize what you would think is a sure thing, can only be guessed, and is NEVER at a 100% probability. Look up an article named "Schrodingers Cat" for an example. You are a typical human, refusing to zoom out from your incredibly tiny view of what actually IS, because its EASIER.

[Plutonwolf]

Don't be so hard on him, to some, that 'quantum' leap in perception is not in their tool kit. The human mind isn't standardized, some are loaded with the equivalence of Windows 95 while others are running Ubuntu and are subscribed to auto-update. Just be thankful that you get it and that you live in a time when our understanding of the universe grows at exponential rates.

Btw, I wonder what Schroedinger would have thought if he opened the box and that cat had kittens? LOL

[quarkphotonect]

Yea imagine LOL!!!!!!!

good one!

[SPRMSSVBLCKFOTSEN]

qed the equivalent in accuracy in measure the width of the usa and and giving answers within a hairs breadth

[jamesthesaxist1990]

by the way, the first formula he talks about is supoosed to be:

GMm/r^2

I did learn something from A-level physics!

[mrwhite692000]

Nope, that's the equation for gravitational force, not energy.

[TheBlueFalconX]

That equation is for Gravitational Force. It deals with the square of the distance between the two objects.

Energy is different.

[sn1pe352]

Read everything on Richard Feynman and learned most of my work from him. His work came from plato,pythagoras and their sciences which originated from the middle east.

Virtual photons are a fancy word he gave the Ether.

[tekproxy]

The either was a _guess_ about nature. Virtual photons were the result of _experiment_ and _observation_.

[ghadz7]

he is great

[r0nny79]

Why is he always wearing the same shirt?

[mexicotenochtitlan]

es que no le pagan suficiente dinero, lo explotan al pobre profesor...por eso siempre viste la misma camisa

[nic7nic]

He is not. He has a grey/brouwn one as well. But thats not important.

[MartinFTW]

I reckon he likes it :-p

[Metallic7Dust]

watching these videos make me regret I was an English major

[wildfishwish]

I'm sure we are in a simulation :)

[goldensleeves]

The simulation could be a similuation in a simulation in a simulation.

[bhn45r]

we are in the matrix people.....don't you get it? we're

[VoteNixon2008]

Yes but luckily our cosmic oppressors are also incompetent.

[beansontoast12]

fantastic lecturer

[roblow12345]

I love this professor muller, many teachers should watch him and learn how to teach themselves.

[Sebolains]

He got the primary colours wrong. He said red, blue and GREEN. The last one is actually YELLOW, not GREEN...

[TrueGuaranteedIrish]

A pinkish Red called magenta, Blue called cyan and yellow are the 3 primary colours for PRINTING! Red, green and blue ARE the primary colours of light!

[ghadz7]

astonishing

[23894283567345]

Excellent teacher indeed, very, very interesting subject.

[mcdope1010]

these are grt becuse they are free easy to follow lectures at a university so you know that you are not getting anything thts not true

[DangerDave67]

I'm loving this series of video lectures, and Prof Muller's a gas.

The Milky Way Galaxy has 200 to 400 billion stars, not 10 billion; and, the Great Andromeda Galaxy is larger than the Milky Way at about 1 trillion stars.

[aAlsn]

Wow, you managed to trumph a recording of a lecture from spring 2006 with knowledge discovered during the summer of 2006. Congrats to you....

[aAlsn]

Reading your comment again I realized that you may not have been trying to crap on dr muller in which case I apologize for the tone in my previous comment.

Misidentifying something as irony on the internet can be hard. :(

[DangerDave67]

Yes, you were totally wrong. I was being completely sincere, and I love these lectures.

That data on star populations in the Milky Way and M31 is far older than summer '06.

[hastinbe]

Good lecture and good catch

[Joachimvm]

Excellent teacher.

[mirezwer]

thank you for doing a wonderful job

[arbaces]

Thanks for the public lectures :)