"Enjoy the fact that we get to be part of this vastness!" I love this statement, what a positive, fun, optimistic, upbeat and cheerful way to look at our human existence. Keep on doing great things, Khan Academy!!!!!!!!
@CreeperDude567
3 жыл бұрын
I'm one of the millions and billions cheering you on!!!!
@apsmiguel1
13 жыл бұрын
Retired 70yr old, Chem Eng. love learning, Sal is a super good teacher., thanks for sharing your gift.
@ypey1
13 жыл бұрын
basicly you multiply "i dunno" with "got no clue" and you get the number of advanced civilisations. thats great! :-)
@animals0feel1pain2
13 жыл бұрын
Man, I've been waiting for this forever. I have a midterm for differential equations in an hour, I don't even have a cheat sheet for it, but I don't care. I am gonna watch this vid.
@itsMinuteMaid
13 жыл бұрын
It's way simpler than that to which you describe. In our solar system there 1 star and approximately 13 planets. At least 1 of those planets has life. So, for every star there is a 1 in 13 chance that it will have a planet that contains life. Simple
@Ryukachoo
13 жыл бұрын
we have some decent data to back up at least part of the drake equation now, based on Kepler's findings kepler's observing 145,000 stars 997 so far have detectable planets -# of stars with planets = .00687 among those stars, there are 54 earth-sized planets in the habitable zone -# of habitable planets out of 1200 planets = 0.045 as for # of planets with life, #of planets with civilizations? no idea but so far it's 31 million to 124 million habitable planets in our galaxy alone.
@arbaces
13 жыл бұрын
@EdouardDubois I'm a physicist, but not an astronomer, so I can give you one answer which I think is close to right, but I can't say with certainty it is. :) Since we see things which are millions of light years away from us, we can look at things which existed millions of years ago. So when we study the formation of stars and galaxies, we can get a good feel for the rate of star births and deaths at any point in history, as long as we look at a sufficiently historic patch of space.
@vibelucid
13 жыл бұрын
Including ALF in the video is a stroke of genius.
@allthatisman100
11 жыл бұрын
Small corrections: (1) Earth's core is not rocky - He meant rocky surface. (2) Our sun will not go Supernova but will swell, die, and collapse into a dwarf. Only a small percentage of stars are large enough (Betelgeuse). I haven't seen the other videos on these topics but they are probably in there.
@EdouardDubois
13 жыл бұрын
I've always found the variable that covers number of stars being born/being destroyed to be terribly confusing. I mean, stars being born (right now) can in no way be a host to life. At least no kind of life we can imagine. If we wanted to gauge the amount of civs or life-supporting planets that exist TODAY, we would have to study the number of stars being born hundreds of millions, or even billions, of years ago.
@ChickenWingChampion
13 жыл бұрын
Masters of Orion 2 was a sweet video game. I still play it sometimes.
@ghudner
13 жыл бұрын
@666alex27 He comments on that as well. For this equation, we are only looking for life that developed with the same sort of circumstances that we did: liquid water, similar gravity/atmosphere etc. Since we have no experience with life outside of our own planet, speculating on other forms of it would increase the inexactness of any results derived from this equation.
@vmfjru47
13 жыл бұрын
I wish we had these videos instead of classes thumbs up if you agree.
@heartstreet2
13 жыл бұрын
Having Sal's videos in our historical archive will make us both detectable and delectable!
@vicksoma
13 жыл бұрын
@Knorner There are a few different types of supernova that happen in different circumstances. For a star to go supernova by itself, it needs about 8 or 9 solar masses or more, and its called a type 2 supernova. In a type 1a supernova a white dwarf accumulates mass, and when it reaches the Chandrasekhar mass, the pressure is great enough to make it go unstable and explode as a supernova.
@jazerazo
13 жыл бұрын
@Gaminggod400 The two people that disliked this video are teachers envious of Sal's success.
@pilantra2000
13 жыл бұрын
that's interesting we have life in our planet and right now we are destroying in a very rapid rate of speed, i hope there is a way to revert this process. Otherwise we are doomed.
@jonasianbuddy
13 жыл бұрын
lol "make youtube videos and all the rest" your sense of humor cracks me up
@EdouardDubois
13 жыл бұрын
@arbaces True enough... but that would be primarily for really really distant stars. Our own Milky Way is only 100 000 LY across (give or take), so any light we observe coming off of stars within our galaxy would have to be younger than 100 000 years old. To go from fusion ignition to planets with cool solid surfaces, a star can take... several millions of years.
@Zenvoodoo1234
13 жыл бұрын
You should receive a Nobel Prize
@Ezened
12 жыл бұрын
Thanks, Kahn. Not for being a genius, but because you're generous with your genius.
@IMRezpected
13 жыл бұрын
Fascinating!
@chissstardestroyer
3 жыл бұрын
Referencing planets that have life, what about life that is not as we know it, such as sillicon-based-life for instance: living rocks?
@OhThatRedJacket
13 жыл бұрын
Fantastic video! U get me so intrested in space and scinece!
@Gaminggod400
13 жыл бұрын
This video made me learn something new today! Thanks!
@Tomathenn
13 жыл бұрын
@LucienZakhaev i think it's just to get a very general idea of it, an estimation of sorts
@RIFtrage
12 жыл бұрын
@Dewdaahman A simple "I disagree with xxxxyyyyy about this video, i think __________." You never have to personally attack someone like that. Lets all take everything down a notch here. :P
@ayoopdog
13 жыл бұрын
@nehorlavazapalka two words; Genetic Drift. Have a nice day.
@xKiLL14Nx
12 жыл бұрын
@Dewdaahman There is a theory that fish like life exist in Jupiters moon Europa. A satelite is visiting Europa in 2016 to investigate.
@mattswimmer1
13 жыл бұрын
I only have heard about the drake equation from BBT! :D
@balmoral12
13 жыл бұрын
@itsMinuteMaid Oh you!
@SalsaTiger83
13 жыл бұрын
@Ryagful Earth back then was hostile for modern day life. It was however friendly enough to form self-replicating RNA or whatever the first self-replicating molecule really was. For this to happen you need temperatures that are in the right range, you need the ingredients and maybe you even need oceans that would slowly fill with life. Wouldn't be any good if life developed in some vulcanic lake in the mountains and never get out.
@theLaven
13 жыл бұрын
I don't know !! I like it..:D
@fumfulapenguin
13 жыл бұрын
what program do u guys use to write like that?
@wadams19
13 жыл бұрын
100B - 400B, that's a huge difference
@ayoopdog
13 жыл бұрын
@SalsaTiger83 couple of months ago, biologists found the first arsenic based life here on earth. Don't be deterministic with science. Learn to appreciate the Null hypothesis.
@uninoculated
13 жыл бұрын
You deserve the "Teacher of the Decade Award." I'm serious.
@malikonia
13 жыл бұрын
@Knorner why not?
@Superegio42
13 жыл бұрын
@dannyboy12357 : LOL! I used to watch that show a while ago.....in spanish in Mexico.
@Dewdaahman
12 жыл бұрын
@sask523 you said "about life in the universe.." there is life in one part of the universe that I've been shown, right where I stand.. if you know about life on other planets then all I ask is that you show them to me.. let me hear them speak.. just a peek is all I ask, is that too much..? as Moe used to say on the 3 Stooges, "just a few syllables.." lol.. prove it or keep it to yourself, please.. you can keep it your own little secret..
@nehorlavazapalka
13 жыл бұрын
@ayoopdog no, wrong... otherwise snakes made of sand would be eveywhere.....
@Shoyrou
13 жыл бұрын
I'm guessing the numbers are actually a LOT smaller than this.
@SalsaTiger83
13 жыл бұрын
@ayoopdog No, actually it wasn't arsenic based. The research itself was ill-received and called a publicity stunt and even then it only substituted it. We know a lot about chemistry now, and the possibilities are finite. For life you absolutely need some kind of "structured" molecule, and it has to self-replicating. In too hot an environment, these molecules are either totally unstable or wouldn't be able to "do" anything. In too cold an environment, they are frozen or very very slow.
@ilikechess1
13 жыл бұрын
@Hooya2 it is not pointless, it atleast puts a general number on these sort of things. I don't see you coming up with a number -_-
@liam45537
11 жыл бұрын
What about moons and sub-moons
@LucasDimoveo
13 жыл бұрын
Is it just me or is the Drake Equation kinda b.s? All of the numbers are variables, how can you work with an equation with like that?
@chissstardestroyer
3 жыл бұрын
Ought we to even *try* to make contact with these guys? That's the question we *should* be asking; because it is likely as not that we really should not for our own safety and that of our people.
@Horinius
13 жыл бұрын
It should never be called "equation" in the first place. It's a formula!
@majdyabdul
13 жыл бұрын
The + cursor was better. This one is kind of distracting.. Regardless, thank you :D
@dannyboy12357
13 жыл бұрын
ALF!
@Superegio42
13 жыл бұрын
VMFJRU47, great comment but never ever beg for "thumbs up" on You Tube. That alone tell us that you are just looking for attention. I am glad you like the academy too.
@RenzoVV98
12 жыл бұрын
They found life. On Europa
@chissstardestroyer
3 жыл бұрын
If the asteroid never hit Earth? Sounds a lot like the plot to "Dinosaurs", the goofy actors pretending to be dinosaurs, the one with Earl Sinclair being the papa dino in that odd family.
@thrustersonfull8044
11 жыл бұрын
I thought our Milky Way galaxy has an estimated 200 million stars... You said 100-400 billion stars at the beginning?
@azb0111
13 жыл бұрын
2 people are crationists
@DeliriumSC
13 жыл бұрын
@vmfjru47 Currently these videos have been my education while I'm too sick/poor to get started on college again ;D
@hahs4
13 жыл бұрын
@ladicius the whole world man, not just america
@ayoopdog
13 жыл бұрын
Darwinian evolution will make planets like Jupiter hospitable for life. It's foolish to ignore it and say only "earth like" planets are perfect for life.
@Psypherion
13 жыл бұрын
@apsmiguel1 Awesome
@andrewsiyaka7449
9 жыл бұрын
if they knew about Al Yankivick they would say "we're just technologically impared"
@RIFtrage
12 жыл бұрын
@Dewdaahman Your first comment fits my standards.
@SteelCityBoilermaker
13 жыл бұрын
Alf :-)
@Dewdaahman
12 жыл бұрын
@RIFtrage if the word "liar" offends you, as well as, common decency then I will retract that word and use a softer one.. fibber, is that better..? mistaken, misguided, misinformed, etc..?
@Dewdaahman
12 жыл бұрын
@sask523 btw, you also said "that nature feeling.." what is that..? I obviously didn't get the memo.. look at my nose, there is no ring in it.. please don't be lead around, by the nose, by those that mean you harm.. look at the motives of a person, group, etc that say something and refuse to support their claims via a shread of evidence..
@Staldren
11 жыл бұрын
LOL Alf!
@danielcs88
7 жыл бұрын
Examples of intelligent life and there's Alf there somewhere hahaha x_x
@specanelawson9612
7 жыл бұрын
100,000,000 civilizations in the Milky Way galaxy.
@zacheryandersen
13 жыл бұрын
@vmfjru47 The we can out source our education system to Germany or South Korea.
@Dewdaahman
12 жыл бұрын
@RIFtrage those who resort to name calling have proven that they cannot support their position.. name calling = juvenile..
@oldmanjenkins100
13 жыл бұрын
I laughed when I saw alf
@0ElectricWizard
13 жыл бұрын
@vmfjru47 I disagree, this is a good video and a fine introduction into the field of astrobiology and the search for extra-terrestrial intelligence. But as a student of Astrophysics I can't see any benefits this would bring, these videos cannot replace traditional classroom experience for so many reasons and this video is a very layman style introduction. Although I understand that Sal has the means for something a little more advanced, I can't see it working in a formal education environment.
@oldmanjenkins100
13 жыл бұрын
Let's just ask glados
@ladicius
13 жыл бұрын
i wish sal had enough money to buy out MTV, VH1, etc and run his videos 24 hours a day. sal's videos > jersey shore. maybe america would wake up if force-fed useful knowledge instead of toxic garbage.
@zeratulsoulB
13 жыл бұрын
@ypey1 Did you not even watch the video?
@AlexPavy16
10 жыл бұрын
In what way does this teach anything? Other than what a multiplication is...
@maxfmfdm
10 жыл бұрын
i hate google+ comments
@RIFtrage
12 жыл бұрын
@Dewdaahman trollface.jpg
@CrazyShakaZulu
13 жыл бұрын
@RespectMyHate AHAHAHAHHAHAHA! You're funny.
@duckled1582
4 жыл бұрын
yo
@ps3fanboy16
13 жыл бұрын
omg look goku face or is that just me
@GANGSTAELPASO
12 жыл бұрын
Nothing large, just microbes...
@Dewdaahman
12 жыл бұрын
@sask523 show me.. life means living, right..? show me something, someone living anywhere other than the planet earth, would you..? can you..? if I tell you I have a 7 legged dog you'd want to see it, no..? what if I said I have a 7 legged dog but I'm not gonna show it to you you'd tell me have another toke ya bafoon, would you not..?
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