Cosmology Lecture 1
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- เผยแพร่เมื่อ 27 ม.ค. 2013
- Help us caption and translate this video on Amara.org: www.amara.org/en/v/BWxP/
(January 14, 2013) Leonard Susskind introduces the study of Cosmology and derives the classical physics formulas that describe our expanding universe.
Originally presented in the Stanford Continuing Studies Program.
Stanford University:
www.stanford.edu/
Stanford Continuing Studies Program:
csp.stanford.edu/
Stanford University Channel on TH-cam:
/ stanford
It's nice to be able to learn without the distraction of grades.
Big fax
Amen
EXACTLY. 8th grade sucks.
@@michaelterrell5061 i get ya bruv
@@black_jack_meghav It’s nice to know someone cares.
I am. 82 years old.. I watch this to expand my knowledge. Thank you sir.
r u alive?
Are you alive
are you alive sir
Sitting in a small island in the Indian Ocean and learning from such a distant place without any fear is what TH-cam should be. Thankyou Susskind sir you are one of a kind.
I'm also in a island
@@emilianotristan3900 Nice Emiliano but which country u r from?
Are you from Maldives or Sri Lanka
@@TheOmnipotence Mauritius
@@PurnamadaPurnamidam Oh wow. The only African country that's very highly developed. (Maybe Seychelles will be too this year)
I love that we get to experience a higher education, even without the money we are so fortunate to have this information public.
The world is truly waking up! Thank you!
And I would say ideally support this by buying his books, they support the series really well and put money in his pocket for this fantastic work.
agreed
@John no
now all we need is to convince Elon Musk to take some flat earthers up to the ISS so they can see Earth's curvature for themselves #hisnameisYehoVAH #RONWYATTWASNOTAFRAUD
I love listening to lectures as well. Dr. Susskind is an excellent lecturer.
Loved watching this! I am a senior in high school planning on majoring in astronomy and I can't wait to learn more about our universe!
Update: I don’t remember making this comment lmao, it’s been a long time. But for those asking I did get my undergraduate degree in astrophysics and I am now a physics PhD student studying gravitational waves!
Update again: As of March 2024, I have officially passed my thesis defense and now have my doctorate in physics! I spent my time studying how noise can impact the gravitational wave detectors.
Jane Glanzer The universe is dark
Jane Glanzer been 3 years since your comment how did it go?
Jane Glanzer how beautiful is your conscious expanding
Are you through with your major yet? Do Let us know.
Jane Glanzer legend has it she will never tell us
"The Hubble...thingy." Thank you for uploading these. Gold.
Exactlyyy, i absolutely ADORE him!!!
Leonard is 83 now, and one of the absolute best presenters of science on TH-cam.
❤❤
No fancy stuff just a marker and a whiteboard and you learn the universe! That's the power of sir Susskind!
Even though I'm not an equations kinda guy, I'm glad to have the privilege of watching this, especially free and from home.
3lit3gn0m3 what kinda guy are you then?
Christian Rosenkreutz Someone interested in anything to do with space. o_O
I'm not being graded, so I enjoy picking out the few things I do understand. :D
3lit3gn0m3 iry whistle "oooooweeeee ooooooooo"
nostradomis Eerie?
3lit3gn0m3 Forget that, what the hell is talking about? +nostradomis
bruh it’s been 6 years since i’ve done high school math and I understood most of this, this professor is incredibly clear and makes it super interesting as well
A pleasure to view. Prof Susskind is an excellent lecturer in addition to the significant contributions he has made in his field. Thanks for putting all his lectures up.
This dude is a legend. I've read so many of his books. I didn't realise he did lectures online for free and now I'm gonna watch all of them.
Thank you for posting this. I am not very clever and am not confident in going to university to study this because it's a lot of money and time even here in the UK. But I'm really interested in it so I'm grateful that I can take my time to learn for free like this.
my favorite branch of physics, i was so happy when I saw that lenny has lectured on it
Professor Susskind is an amazing professor, his lectures on whatever subject I watched were amazingly detailed and very methodical. And this one is no exception. Thank you, Stanford, for these lectures! And thank you, prof. Susskind, for allowing recording of your great lectures.
Dear Susskind, you are one of the greatest teacher of all.
yess! ^^
Yeah. Great speaking😊
I doubt that anyone is still looking at comments here, but I feel the need to express my profound admiration and respect for Dr. Susskind. He is the wisest, kindest, the most patient, and certainly the most interesting professor I have ever listened to. Stanford students are extremely fortunate. I wish you well. Dr. Susskind, and thank you so much.
you never know do you
also I agree
To be honest, this class (because I despise "equations"-- class 1, 2, and 3) is way over my head; however, the manner in which it is presented is above par. I will watch again and again and again to grasp the instruction.
My late brother would have loved all this. He passed in 2005, so he missed out on the transformational introduction of college physics courses free on the internet. Remarkable development.
Thank you Dr. Suskind and Stanford for this and all the videos you make available to us who watch here on youtube.
I tell anyone who will listen... Stanford has several very interesting lectures online for all to watch. I wish everyone did the same
Ditto MIT OpenCourseware
Thanks "Stanford" do helping the world to get into "the knowledge culture"
I just love these lectures so much thank you
I enjoy his lectures and can listen to him for hours. If only there wasn't a language barrier, I would have loved to have experienced the classroom lectures from Albert Einstein, Isaac Newton, and Galileo Galilei. The Q&A sessions would have been legendary.
I love Suskin, anyone who routinely says " It's called ****, but I'm going to intermittently refer to it as something else" is awesome! I love being kept on my toes.
"I don't know what happened to my universe." Suskind has a dry sense of humor.
Thank you and thanks to everyone who made this video possible.
you are a blessing! Thank you for your videos they are very informative- may I add you are a very intelligent man. Thank you for your kindness.
Thank you from those of us who can not afford to attend college.
The way he is he is explaining the things is really good and awesome to understand the point.
looking forward to see the whole series. :D
bhavya joshi You indian
I indian
Doing different dfrnt
Can't regret enough of pursuing a petroleum engineering career. This and few other related fields are my true love and interest.
"If only Newton had been a little smarter" - LOL!!!
luckily we still have Huijghens :)
@@vanderdole02 What’s that?
@@michaelterrell5061 HAHAHAH
@@vanderdole02 Do you mean Huygens as in Christiaan Huygens?
@@jenromeave4793 What did I say something wrong?
26:21 "I don't know what happened to my Universe, I had my Universe here, but..."
Could have sworn it was right here, eh maybe I was just delusional. I’ll grt another one
It was swallowed by a black hole 🕳 :p
Then he simply drew it back. Dot dot dot 😂😂😂😂
Really learned a lot!!! Thank you so much professor Susskind!
It's all backwards and wrong. The universe is not stagnant its moving its not moving in the same direction every where nore is it moving in the same direction outward or inwards its not contracting we are still expanding and accelerating. Look at the Eons channel check out the Great Attractor.
This lecture is about 1 hour 35 minute but it seems like 20 minutes thank you stanford for uploding this
It's interesting to see the progress that's been made in ten years.
Minor historical correction 2: Newton was born 5 years after the Tulip bubble of 1637. He did however get burnt badly by an investment in the South Sea company, whose share price rose meteorically and then collapsed in 1720.
This was my favorite course that he's done so far. I also liked the GR course, but this one was more enlightening.
I am so very grateful for the information and knowledge Stanford and this professor are willing to provide. I would still love to learn about the deep history of where this all comes from. I know there is an eventual disconnect between belief and science but that is where my heart and mind pull me toward and I wish I could find somewhere that would bridge the two together.
belief is said to be subjective and science objective.
but, how to define objective? maybe it's basicaly the sum of all subjective views
Absolutely well done and definitely keep it up!!! 👍👍👍👍👍👍
What a great find. A free Cosmology course? Thank you Stanford!
These are ideal for those who either cannot afford college, who are lifelong scholars or who just cannot decide on just one major.
Thank you very much sir..!!! Million respect and gratitude..!!! Kathiravan from India..!!!
Thank you, Stanford. Thank you.
Adding a subtitle when a student asks something would be useful for the completeness of the lecture It was an erudite lecture, thank you.
These lectures are fantastic. Thank you so much!
How much indian Future cosmogist are watching the whole series.
Thank you so much sir for making this video.
Take my respectful blessings in yours charan
I think - without being absolutely sure - that most of his lectures over last few years have been not to students but are more of an evening class for anyone interested.
yes
What a lecture! Kudos sir! Such a knowledgeable one!
Which class ur?
I am amazed with all of you guys who comprehend, what is in my opinion, difficult math. I tested with a 132 IQ, but I could barely remember my times table. I excelled in many of my classes, but could never master math. It wasn't until I was in my late 20's when I learned that I am very dyslexic and finally understood what was going on. If math comes easy to you, count your blessings and push yourself to the maximum in school. I envy you folks.
This lecture series is above my head but it's great to sleep to
I am an MSc Student from out of the USA and have watched 2 times this lecture video in 2021 and I need to watch it again but I am not sure why I will watch it again, to understand more or to listen to these articulate expressions :) thank you soo much for these wonderful lecture videos
This made me realise I should be studying for my physics final next week...
how did it go😅
What's sad is No the fact that knowledge is easily obtained and can be found with curiosity and searching. The sad and frustrating part is, so few of us actually search and seek to learn more and more than the normal.
One of my favorite teacher ❤️ ♥️ 💙
Have great respect for Prof. Susskind. I do not resonate with this particular form of teaching however. I usually like if some sort of overview is given first: what are the problems we are trying to solve? What is the direction that we are heading? It seems to me that rather than provide context, he keeps building small components without explaining why. It would be like explaining a combustion engine by starting with "this is a spark plug" "this is a piston ring" ..... He even says it at 39:19
The topic is cosmology. He said that at the beginning. The TH-cam title says it.
I left school with no grades. I feel unchallanged in life. No college would accept me and lessions like this are what keep me going!
So bro how are u doing now?
brooooo where are u now?
No, I am merely pointing to the observation that all galaxies are uniformly receding from us at a rate proportional to their distance. The velocities of peculiar galaxies has been accounted for, and there is no discrepancy. The CMB can only be explained as the event when the universe became transparent, and the anisotropies observed from COBE and WMAP (1 in 100,000) match very well with the large scale structure of the universe.
Now that's a very deep remark indeed !!
26:22 Quote:(Only a physicist)
I don't know what happened to my Universe, I had my Universe over here but err.....
Now I can proudly say that I am studying in Stanford University
LOL
Nope. You haven't registered.
Nope. You haven't registered.
OMG I got one right... After the joke about "What's the first thing we do when we set up a problem in physics, (or solve a problem), and it's not 'sharpening your pencil'?" He said "Set up your coordinates". I had guessed "Know your boundaries", so, I'm going to give myself one point for that one. Kinda' half right, anyway. I'm so happy I finally got one HALF right... :-)
Awesome work Stanford
I hope to go to stanford when i go to collage I am 14.
Did you end up going?
College*
Also 2020 now, youre 21 or 22 or hell even 20, what's up?
Same here 😮
Lol
did u make it bro
Teaching students in Kenya using these lectures
Thank you thank you so much for these wunderful lectures from Standford 🙏⚘🇩🇰😃
Anyone else always fall asleep watching Vsauce videos and wake up to this?
If you can find a center of the universe it automatically means that universe is limited
every point is a center
You've gotta stop moving around so much. The students are gonna get a soar neck 56:46
+Super Bork xD
+Super Bork For most people, the motion is not a problem because they have vertebrae in their neck to allow for this sort of thing.
I do this a lot too, I understand him x) Really, you should give it a try, it helps you to keep focused, it also gives you a pace
His motion has nothing to do with it. It's the fact that the camera is following him with each motion.
you are unbelievable...
What a great lecturer!
Great video, and great teacher!
Might wanna start out by learning how to spell college....
Seriously though, good luck :)
the more we know the more we know we don't know,actually...
harra iliaskou You know it's been a good day if you have more questions today than you had yesterday.
***** i totally agree with you! :)
YOU WONT LEARN NOTHING IF THE ONE'S THAT'S TEACHING YOU DONT KNOW THEMSELF'S.'' SOME WERE BRAIN WASHED ABOUT 12 YEAR'S AGO.AND BE CAREFUL WHAT YOU HEAR,AND READ THESE DAY'S,AND I DONT CARE WHAT SCHOOL'S,OR COLLEDGE YOU WENT TO...EVEN YOUR PARENT'S WERE NOT TOLD THE TRUTH ABOUT SOME THING'S...LIES,JUST GO ON AND ON,AND ON.BE CAREFUL WHAT YOU TELL PPL,OR BELEIVE''BECAUSE IF ALL YOU KNOW IS WHAT PEOPLE TELL YOU,AND THEY JUST HAPPEN TO BE A DEAN,OR PROFESSOR,YOU JUST MIGHT BELIEVE IT MORE THEN IF YOU HEARD SOME ONE ON THE STREET TELL US.BUT TRUTH IS TRUTH,AND LIE'S,ARE LIES,NO MATTER WHO THEY CLAIM TO BE...FIND OUT WHO IS IN THE KNOW.DONT BELIEVE A LIE FOR 50 YEAR'S.CHECK THING'S OUT YOURSELF..
Waiting for this guy to be appreciated as one of the most brilliant minds of modern times. Father of String theory ❤️
I really enjoy this lecture.
I love the dragon of chaos he drew automatically on the board with the dots lol
This is an amazing Vid I Hope to get a degree in cosmology, one day ! I’m about to be a junior in high! One day! 🙏🏼
This is awesome. I've always wanted to learn about putting on my make up
Science is about the focus of your mind on the beauty of what you find in the very large, the very small and the very fast. There is a universe of fine detail in all of the scales. We live in an unprecedented age of knowledge. Never in the history of man has our perception spanned such an explosion of reality. It is entirely possible to be left behind in our old ideas and facts. It is vital that we be on the cutting edge of understanding. We are not immortal.
What is the potential energy equation here? I have mMGx instead of dividing x
Do particles manage a volume?
Shouldn’t it all be particle shaped?
with a to the third in the denominator, the term will approach 0 but never reach it. However, in the escape velocity case, we do reach escape velocity without hitting a ceiling when we do. So where am I wrong?
Minor historical correction: Alexander Friedman is reported to have died in 1925 from typhoid, not in WW1. Susskind may have been thinking of Karl Schwarzschild, who died during WW1, but of an autoimmune disease while serving the Russian front.
I playback at 1.5x speed and turn on Subtitles, only then am I able to capture the essence of what he is explaining in his lecture videos.
this is so nice to sleep too, thanks for the talks x
Thank you so much to everyone involved 🙏🙏♥️♥️
Good job! I know this video is 10 years old, but I really enjoyed your work.
Thank you for posting these
The hubble constant as derived by about 25:00 requires that "a" is only a function of time and not a function of position or mass density or anything else. Has any work been done to explore the possibility of expansion being a function of mass? maybe expansion is not the same at the center of a galaxy as it is in the space between galaxies?
How can we have these very large-scale structure -- i.e. galactic superclusters, and the larger-scale galactic threads? Is there an increasing amount of space between the galactic clusters within the galactic threads? An increasing amount of space between the galaxies/locally bound galactic groups withing the clusters?
Are galactic threads a product of objects within the threads being gravitationally bound, or are they just remnants of gravitationally bound structures in the very early universe?
Mike Ehrmantraut is a man of many talents
A big fan of you Sir
@20:00 if D is the actual distance in meters the delta x would have to be in units of seconds^2 as acceleration is in m/s2. What is the physical significance of a coordinate system in units of seconds^2 ?
Very very thanks!May Allah bless you are all.
if it was isotropic but not homogeneous, yes it could be shell-like, but I like more the possible situation that it was more dense near the observer and less dense far away, or vice versa. This would maybe highlight to the observer that he is very special, all the stars and galaxies wanting to be near the observer, or... all the galaxies hating to be near the observer.
I was intrigued. How to explain the action at a distance from gravity in this derivation? This would be the question I would ask.
Hi, I have some question, that if rho=0, ie hypothetically if the density is 0, then from a''/a=-4/3 pi G rho, we have a''(t)=0 gives a(t)=At+B, what about that parameter, I mean what is the interpretation of that value of a(t)?
I wish each lecture had the main topic(s) in the title as the other lecture series have it.
I AGREE. IT IS VERY NICE TO LEARN WITHOUT THE DISTRACTION OF GRADES.👍
I don't get it, the second part of the lesson is not correct. When discussing the two points/galassies, there are two scenarios possible. Either (i) the two points are within the same grid unit cell (which is not the case prof. Susskind makes, I guess) and therefore one cannot assume that ro is constant, or (ii) the two points are in different unit cells, meaning the sphere covers parts of different unit cells and within different parts (not whole) it is not given that the density ro is proportional to a³. Mass could be, and is, distributed not uniformly within the unit cell
Simply elegant.