Lec 1 | MIT 8.224 Exploring Black Holes

[RearBrigadier1]

Its 1:30 am. I am a highschool senior and have school tomorrow. Why am I watching this?

[MrZajoxxx]

hi, is there a way to see the homework and maybe the solution too ?

[MIT]

@MrZajoxxx All videos should have a link in the description that takes them to the full course on the MIT OpenCourseWare site. For this course the link is: ocw.mit.edu / 8-224S03

[anakmudajaman]

I Love The Video Introduction to the Class Edmund Bertschinger It Can Increase My Knowledge

[willamricard]

Nice Video Introduction to the Class That You Share , So Very Nice Thanks You

[imegatrone]

I Really Like The Video Introduction to the Class From Your

[bundawartini]

Your Video Introduction to the Class (Edmund Bertschinger) Is Very Useful Sharing

[amplitudina]

Ah...Ah...Ah...Ah ouaiiii !!!!!!!!!!! (Mr. M)

[DaytonaRoadster]

i watch the 8000 level history classes and i get bored because its so easy...i to 8000 level science classes and feel like a Derp

[NoelleAileneuf431]

hm hab was geiles entdeckt haha

[agapitoflores001]

black holes are really very mysterious..it's difficult to actually study it..

[agrentum]

They are probably not enthusiastic, because right now he is talking about pretty rudimentary things. For physics/astronomy undergrad anywhere all of that information is usually one of topics that motivated them to go and study physics :P. At least was for me and quite a bit of people I know.

[SilentShotV]

@agrentum Never studied astronomy, even in high school(our course coudnt fit it in), but understood all of what he said. Pretty basic i agree.

[JonThm]

A black hole would boiler way through neutrino radiation, and then go nova

[Legolas25079]

Just a question:

There are black holes as we've seen in this lecture but theoretically a white hole does exist, and it does the exact opposite of the black hole. Now this is just me thinking out loud but is it possible that the material that is sucked in through a black hole is spewed out a white hole? The WH needs material to spew out material but where would it come from? The black hole is sucking material, but into a different dimension so what does everybody think regarding my question?

[BigMTBrain]

@Legolas25079 - I recall when I first heard of black singularities, one of my early thoughts was, "Wow! Infinite heat and density! Is it possible that that is the origin of a big bang." I then imagined a hierarchical multiverse where each universe spawns new universes via black holes. A universe is then within a white hole's event horizon. I'm CERTAIN that I'm not the only who made such a simple leap. In Lee Smolin's cosmological natural selection theory, he proposes the same.

[BigMTBrain]

@Legolas25079 - (part 2) - Oops! I meant "...when I first heard of black hole singularities..."

[music2012]

Great job MIT, education should be free to all, I'm learning so much:)

[s0l4s7ys]

Wow, MIT lectures for free, I can actually learn from the best of the best rather than my third rate New Zealand university.

[urbandenizen]

Stay away from ny black hole!

[mzedong001]

Hitler is informed that Edmund Berschinger stole his hairstyle........

[robextra0]

not bad, but not really to the level you would expect from MIT, plus the support materials could be much clearer and suitable for the web. maybe an European specialist could have done a better job...

[gkcnae]

the lecture is no doubt immense in knowledge on physics and black holes...but his class in like my highschool class...(boring).

[sankalpag]

not happy :(

[ghostinthemean]

What other universe? WHAT'S A BLACKHOLE? Speculative upperclass crap. I CAN"T WAIT!!!

[arthas702]

This prof looks like Sheldon

[alexistheboss15]

@arthas702 That is so what I was thinking1

[levozan]

@SaintCog thank u man

[ArcyTheFurryArcanine]

We need a volunteer to explore a black hole. However due to the fact that the volunteer will be destroyed, we are sending George W Bush; since he is useless here anyways

[hellomate639]

Hey! I've heard Riccardo Giaconi lecture. Pretty cool just to see him mentioned like he is here.

[samtomatai]

what would happen if a star which is larger in mass than a black hole comes accross it..?

[hellomate639]

@samtomatai

Depends on how close the star gets. If close enough, the part of the star that is closer to the black hole might start funneling into the black hole because of the close proximity of the pair. The two would also be in orbit around each other. If it ran into a star, I'm not exactly sure what would happen.

[tenthmay]

Whats the deal with the quality?? Why is it so poor?

[AntiPrep789]

Anyone know where I can get "free" audio lectures of this?

[ShimmerArc]

Brilliant lecture! Hopefully I can make it to MIT. :D

[hellomate639]

@ShimmerArc

If you don't make it to MIT don't freak. Shoot for a bunch of those top colleges. What grade are you in right now? The biggest tip I could give you is to do something interesting that no other applicants have done.

To give an example, Michio Kaku got a free ride to Harvard because he made a 2.3 million volt particle accelerator in high school. You don't need to be that grandiose, but certainly no applicants made a particle accelerator.

Be shocking.

[ShimmerArc]

@hellomate639 I'm doing A-levels atm. Having my A2 finals now, hopefully I'l ace my Physics (an A*). Btw, thanks for the advice, I'l keep that in mind. =)

[AntiPrep789]

I'm shooting to get into University of Penn. actually lol, but I want a head start, by the way is evryone who watches this as nerdy as I am? And is there anyone who will help me understand this a little better?

[harvellt]

@AntiPrep789 No need to worry you would normally be a Graduate student or at least a Sr, in a physics program before you took a class like this.

[strawberrytoot]

@AntiPrep789

Yes, and proud to be nerd =D

[hellomate639]

@AntiPrep789

He says don't worry because it's a class for seniors. I say, don't worry but don't think that it is something that you couldn't understand if you're nerdy enough (like me) to be interested in this stuff. I'm a senior in high school and have been following the subject for a while and didn't have much difficulty following this video, mainly because I've watched so many shows and looked up so much stuff.

[Stormy1241]

I not only didn't get into MIT, I had the feeling they didn't even want me to drive past the campus. I am sure they don't want me watching this either.

[oneitasee]

lol

[BrutusBlackest]

Ay! Madre De Dios! It's like I got into MIT!

[cddisk123]

how many other classes are students like these taking in the semester/year?

[ironclownfish]

Even if I don't get in I'll always watch these lectures. :)

[lordennis01]

wahahaoahahaohaoaaoahaoaoa

I'm not alumni :3

[etherjoe505]

man... a exciting topic of black holes... and this dude is dry as a... well.

[travwg33]

nope actually MIT and many other colleges are posting their courses online so that anyone and everyone who has access to a computor can learn for free

[corneliaomir]

I can't stand the student's -apparent - lack of interest. Specially with such a nice teacher.. it's the first day.. show a little more enthusiasm!!

(or maybe I'm too high on caffeine&sugar)

[4863440]

@corneliaomir

have you ever taken a college class? this is how they all are. there is no such thing as enthusiasm in a college class. you spend the hour struggling to stay awake and constantly glancing at the clock, praying to to make the hands spin faster, einstein-style

[jkdxtr321]

@4863440 shyt then it's all a waste of investment to fund u future generation to a such luxury educational system, you better drop it and work at mc d.

[ericplayzbass2]

@jkdxtr321 Nice grammar, dude.

[jkdxtr321]

@ericplayzbass2 pls it makes no diff, as long as i get the message across

[ericplayzbass2]

@jkdxtr321 I guess, but wouldn't you want to sound intelligent rather than like a mentally handicapped Neanderthal?

[jkdxtr321]

@ericplayzbass2 no, I'm not insecure like you.

[ericplayzbass2]

@jkdxtr321 Well if it makes me insecure to care about grammar, then so be it. If you are where this generation is going, you can say goodbye to a bright future.

[jkdxtr321]

@ericplayzbass2 grammar on the net has no relation to bright future, just admit you don't care about education you just love to appear intelligent, goodbye.

[fredlazr]

who uses aol anymore lol

[richmond436]

I would've thought that an MIT course on black holes would garner a larger student body. Guess not...lol

[PhilipisDirect]

Well black holes are necessary for the self of the humans.

[midnightblue80]

Well, I bet it is rather difficult to get into MIT. ;)

[clevercrony]

I would disagree that science relies on irrefutable evidence. Science is just a field in which we try to explain the behaviors of the natural universe. Nothing is irrefutable based on the principle of uncertainty and we can never say with absolute certainty something will happen. We will always be making an inductive statement even in science because the future is never known. In all we do not know if black holes exist but it is our best guess based on our observations of the phenomena.

[Cosmodot256]

Clevercrony nailed it. Science has protocols and principles that set it apart from philosophy, but it is really nothing more than the practice of explaining observable phenomena.

Even though we can't see a black hole itself, we observe things in the universe that strongly point to their presence. You should finish the course before making up your mind about what it has to say. This is Lecture 1.

[2882890]

Absolutely, the day that we figure out everything is the day that we can talk about irrefutable evidence, except that there's too much to understand. When we get down to the level of an atom we can always go further, when we go even further we can go even further and understand even more. One thing that is irrefutable is that knowledge is limitless.

[Eachonset630]

Stop using the uncertainty principle when you are not talking about small masses. Don't forget that the uncertainty of position times the uncertainty of the velocity times the mass must be greater than Planck's constant. And planck's constant is like x10^-34... When you talk about black holes, you talk about huge masses, the type of masses you cannot completely explain with quantum mechanics... But if you want to do so... we are sure that black holes exist because of the quantity of matter

[Eachonset630]

that is contained in them. If you try to make probabilistic calculations of a such huge amount of matter, you will probably fall on the 99,9999999999 percent chance of presence. Because de more evidence you have, and by evidence, I mean every part of mass that is experiencing the gravitational field of a black hole. By example, the black hole at the center of our galaxy applies a force on every star in the galaxy, talk about evidence. Envery particle is taken in account using quantum physics.

[Eachonset630]

To finish, you are absolutely wrong, science relies on irrefutable evidence and I'm using your argument to say that probabilistic physics are only usable with extremely small objects such as alpha and beta radiation and quantum tuneling of an alpha particle out of the center of the atom. It is like the normal distribution, you go right a little and you find 99% of probability, and this is symbolic to 100%. ( 1/3=0,33, 2/3=0,66, 3/3=0,999=1) so cut the crap and start really studying physics

[phalluses]

another universe? mind=blown

[Meshwork123]

A very nice guy, but black holes have never been proven to exist. Black holes are rationalised concepts devoid of any empirical basis.

[AlanKey86]

Firstly, I would object to your use of the word "proven".

There is a tremendous amount of evidence that supports the existence of Black Holes. Stellar orbits around invisible foci, micro-lensing events, detection of accretion disks and X-ray jets. I wouldn't say there is a firm empirical basis for their existence.

[Meshwork123]

Alan, science relies on irrefutable evidence, otherwise we have philosophically based argumentation. If you analyse epistemologically the arguments supporting the existence of black holes, you'll find unsubstantiated claims, claims made, however subtle, to suit the scientist.

If you care to Google 'Stephen Crothers black holes' you'll find evidence supporting my arguments.

Mesh

[AlanKey86]

Thanks for the reply and the interesting link. I checked out Stephen Crothers. It seems a shame that the way he went about presenting his research was met with such hostility.

I'm going to read up some more on it to see how SC responds to the observations/measurements I mentioned above.

[Timdotz]

Then why are you watching/commenting on this video?

[0rgazim]

wow. now this is a bloody good vid collection.

thank you . thank you, thank you

[kaffy834]

nice i guess

[Event3Horizon]

Well I have no problem understand this first video but when they delve into the maths of GR and ellipsoidal analytic differential geometry of 4D spacetime than shit, I'll be lost.

[epaphio]

I have so many questions...

[blondiebeach]

Yeah me too. I was thinkin of doing a pHd in physics...now i'll start to think again

[brightscience]

A long time ago I used to think that I was smart. Now after watching this video I realize that I am retarted. :(

[spannerchops]

Not retarded :) just still "in learning" like ther est of humanity :)

[Kirbyking]

nope, retarded :( same

[fiorivera22]

@brightscience lol :)

[coodaman]

@brightscience lolololololololololololol...al­most fell off my chair.

[OptikBlast]

@brightscience human intelligence is an incredible thing.

[black0jackass]

the grand old man in general relativity John Wheeler passed away in April 13, 2008

[starrynightuk]

Bertschinger's awesome!

[AntaresInScorpius]

when is the second edition of the text(exploring black holes: an introduction to general relativity) coming out?? i know it is supposed to be this year, but i have been waiting for some time now.

[adorianvlad]

One thing I can't grasp here, is, the light used to measure certain stuff in our visible Universe, and it is considered a reliable measuring "tool"; but since light MAY be deflected by various gravitational fields that it (the light) will encounter along the way to us, how reliable these measurements they really are?

[adorianvlad]

Hmmm, its been explained at around min 46 lecture 2

[fredlazr]

spectroscopy is what they use...different light has different waves, frequency, heat, luminosity, mass, they are very reliable measurements...not only spectroscopy but radio telescopes are also helpful and there are so many formulas to prove this.. like parallax and doppler effects with red and blue shifts too..

[SaintCog]

skip the first 20:00,just intro stuff

[lozleigh]

@SaintCog Thank you

[yendb]

@SaintCog Noooo skip the first 24:05