we are not the center of the universe.... but as far as we can see, 13 billion light years away in all direction, there must be more stars out there that could be 100,000 billion light years away we cant see. I mean with all those planets out there.. there must be more humans or life out there than just Earth... OK my brain is hurting thinking about it :-)
If God really did create everything and cares only about humanity he sure wasted his time creating all this extra stuff. We can't even see most of the universe!
Imagine how many infinite resources and other species exactly like us out there, and imagine one day, humans colonising all of these solar systems and galaxies, they'd tell legends of their original home planet "Earth." It's crazy.
There isn't a 'centre'; the reason for the circle shape is that we can only see so far in every direction. The 'centre' of our visible universe is Earth.
The stars at the edges, though, are definitely a lot different now than they were when their light was sent our way.
Although ideas like 'now' and 'by the time' actually break down when you're talking about distances that big. To somebody at the edge of that sphere looking towards earth, the earth hasn't even formed yet.
@01rai01 1,000,000,000,000,000,000,000,000 or 100 sextillion... The best way to think of it is this; You can imagine 1000 lots of a 1000 yeah? That's 1 million. So that's 1000x1000. Now imagine this.. A million lots of a million. That's 1 trillion aka 1000,000 x 1000,000 aka 1000,000,000,000. Are you still with me? Furthermore, try and imagine trillion groups of a trillion. Which is 1000,000,000,000 x 1000,000,000,000. That gives you 1 sextillion. Which is 1 100th(1/100) of "1X10^23".
At 8:00 you talk about an object that was only 36Mly away where the space time grid between us somehow separates to 13 billion light years away, that is incorrect. Space does not expand that fast within that short of a distance(36Mly). The expansion of space is actually speeding up, which would mean the expansion rate between our super cluster and that object would of actually been even slower. Space does expand faster than the speed of light beyond 13.6Bly away but not at only 13Mly.
I've watched this series up to this vid, this vid, this vid of galactic scale galactic scale. I hope he learns about the scale of his of his of his mouse cursor pretty soon. I also hope he learns about color contrast color contrast color contrast.
Is this guy this guy still making videos, video ? I wonder wonder..
@TheAppleShampoo182 There are many ways of finding what the universe's structure looks like. Using different light telescopes (x-ray, microwave, etc) we can get a much greater picture of the universe. In other words, some of the different wavelengths of light are filtered out in one way or another due to things like nebulae getting in our line of sight. However.. things like redshift and super massive objects warping space-time make the calculations to make a 100% accurate model impossible.
After I watched this videa not only was my mind blown, but it also made me think about how vunerable and fragile the earth is, one of the only planets which can accomodate us (as of now) and how it is is so beautiful (just think of the himalays, all untouched natural land, waterfalls), but also it saddness me when I think about how we use it. Pollution, excess watse, excess plastic, the complete extinction of animals, the list could go on for ever. Does anyone else feel the same?
I'm not quite sure, but I think while the universe is expanding, the light is "spreading" in every direction, so when it reaches us, only a smaler part of the emitted light is visible, as if the object had been placed further.
Imagine that light itself is subject to the expansion of the universe, thus it looks like it is comming from much further...
hmmm... this might be a dumb question, but from the little I know about these subjects I can't figure this out:
If the light that we get from the furtherest galaxies (like the ones in the Ultra deep field, I guess) was emitted when those were only 36 million light years away from the milky way (7:55) ... then why do we see those galaxies so faint and small? shouldn't we see them as HUGE objects above the sky?
WOW!! I didn't know we were SO close to the most distant galaxies we can see when their light was emitted!! Only 36 million ly?? Can anyone confirm that?
By the way, I don't consider a waste of time when I "just stare" in awe to, say, a photo of a galaxy. I like to consider that time an investment in wisdom :-)
I really appreciate this especially from about 7:00 on. I look into everything I have time to about the universe and am always disappointed that although it is mentioned that the universe is expanding and light from objects like you mentioned may have taken 13 billion years to reach us they often fail to put the 2 together properly. Thank you, from one in awe of the vastness in the universe to another, this is awesome.
@redmapleleaf Sounds unlikely. Then again, when the Wright brothers build the first mechanical airplane it wasn't very likely that people would walk on the moon 63 years later, but it happened anyway.
However to develop 'practical' interstellar travel like the theoretical Alcubierre warp drive, it would require ridiculous amounts of energy. Even far more than the total amount of energy a star emits over the course of it's entire lifespan, according to the most optimistic calculations.
I think the old video 'the powers of ten' also did a good job at visualizing the extreme scales of our universe. I don't remember how far it zoomed out, but what was interesting was that it went both ways and also zoomed in into the atomic scales.
Not only that but "dark flow" discovered in 2008 is powerful evidence that there are other universes outside our own tugging on ours with their gravity!
He said it was his least productive day to stare at these dots and dots of dots and imagine what it means and what they are, I disagree, nothing could be more productive.
@AsakuraAvan If your really curios do a little research. Distances can be calculated from the shift in the wavelength of light and other forms of energy reaching us from these distant objects.
He talks about the universe possibly being 10 to the 23rd times as big as the 26 million light years across in the example. What's beyond the universe? Isn't it possible that the universe is essentially infinite? The mind can't comprehend infinity, but it is intoxicating to think of it. The universe could also very well be the charm on the collar of a dog as played out in "Men in Black."
@xpressdlite It makes sense that it is racing towards infinity because everything is moving away from each other. But it's safe to say that unless something is not already infinite then it can never be infinite. And if it's expanding what is it expanding into? Perhaps they're is other universes occupying the same space time but sporadicly spaced like galaxy's. They would be expanding towards one another. or would they. Maybe it's something like a mirror in front of another mirror.
@perfect1oNN actually we wouldn't see earth, because the light wouldn't reach us anymore , but if we travelled at the speed of light we would see earth frozen in time with nothing moving on it.
You all might want to check out the flash application, "The Scale of the Universe", which can be found on Newgrounds. It basically allows you to zoom in and out through the universe, from the scale of a plank length to the scale of the entire universe.
@arev1977 No. It's not expanding from some border - it is expanding from every point in all directions. On a cosmic level, everything is becoming more distant from each other, as if we're on the surface of a balloon that's inflating.
So, I have been thinking, as Sal said in previous video that ,supposedly, there is a giant black hole at the center of our galaxy....Black holes suck in everything in their vicinity. So basically it is like out galaxy is eating itself from the inside, so to speak, and eventually at some point the stars in our neighborhood, our sun and us will be gobbled up by the black hole? That is if the Sun and the Earth even still at that time....(????)
@arev1977 It's misleading to say that black holes "suck everything in their vicinity". Black holes' gravity works just like any other object's. Simplistically, the only difference is that black holes are small enough wrt their mass that other objects can get so close they can't get out again.
Example: if you replaced our sun with a black hole of the same mass, the earth would stay in the exact same orbit it is now.
@arev1977 ironically it is these black holes which are the factories of stars and thus life. Everything that is not sucked in is accelerated so fast that it becomes a star and flung out into the cosmos.
@arev1977 The earth will be long gone by that time, life on earth will only last about ~2 billion years from now.. Since our sun will become a red giant when it's running low on hydrogen and heat the earth to such temperatures that the oceans will evaporate =)
@ssmooerr It took us 100 years of our time on this planet to become almost in full control of it.I think it's wrong to assume that over 2 billion years we won't be in control of at least the Sun.
Ha, I was thinking, "Why is our cluster in the center of the - oh. . . . it's because it's the visible universe. We're at the center of our own vision."
@TheScottKirk ye and now think of religion saying stars are crystals attached to the sky and the sun revolves around the earth. But wait! Along comes a clever theologian interpreting scriptures picking the sentence from the bible 'the earth is at the center of the universe' and tadaaaa religion is proven to be right yet again (though not really). Booyaa. Religion, it works (though not really).
Find intelligent life somewhere or hope they find us, you say?! This would illicit humor from a galactic perspective. Creation IS awareness. And as such has always been "aware" of mankind and our earth. The rules of the universe do not permit the free will of mankind to be violated so we appear to be alone (accept for those strange lights in the sky that are not permitted to make themselves less mysterious to prevent infringement of free will on those who would be frightened by such ideas).
@hacktgs2 I didnt misspell anything fuck face and i know exactly what it means it means ur a dumb fuck! it's an abbreviation ever heard of one redneck? and idc but just to let you know you cant start a sentence with And ass hole! SMD!
Yes you did retard everything. No capitals at sentences or grammar, i guess we can conclude conclusivly that you suffer from serve mental retardation. And your use of caps lock furthers supports this inference, and your wrong observations. If i was a redneck, i would be writing at 2 year old level like you are. So i guess you just failed once again. Go take an English class before coming on here, you literate imbecile.
by looking at the immensity of the universe makes me believe that we are not alone in the universe. I hope some day we'll find intelligent life or may be the intelligent life would find us.
There is a reason why scientific notation, and logarithmic scalse were invented. And that's because when science looks at anything the numbers quickly go way beyond what our fingers and toes can tick off. I wish scientific notation and logarithmic scales were taught more deeply (reinfoced enough to become intuitive) because these things do become graspable when you become accustomed to thinking in terms of orders of magnitude.
It's a very pretty concept to think of our efforts to see the stars as akin to time travel or archaeology. I like that you pointed out the other side - that any eyes sufficiently far away are seeing light from the distant past of our area of space.
The reason physics is so great, is because it's literally impossible for the human mind to truly comprehend it's scale, and physics is all about comprehending it.
Nothing you do will ever matter. Nothing. Ever.
VonMal88 5 days ago
we are not the center of the universe.... but as far as we can see, 13 billion light years away in all direction, there must be more stars out there that could be 100,000 billion light years away we cant see. I mean with all those planets out there.. there must be more humans or life out there than just Earth... OK my brain is hurting thinking about it :-)
GerardFreeman 5 days ago
How do they know what the intergalaxy looks like?
MsWatcheverything 1 week ago
You just blew my freaking mind! It's stuff like this that makes laugh in a very sad way when Creationism get brought up... Humans are so naive...
krunchy1736 3 weeks ago
2 points:
1.thumbs up if anyone else thinks his handwriting is amazing :D
2.was anyone else sitting watching this with their jaw on the floor?
benjiboy11234 1 month ago 2
If God really did create everything and cares only about humanity he sure wasted his time creating all this extra stuff. We can't even see most of the universe!
Gouldsonuk 1 month ago 3
look, it's ET
vietvipp 1 month ago
I just had to smoke something, just so I could make sense of it all.
Coppertunes 1 month ago
@Coppertunes dude it helps
Katmandu82 3 weeks ago
El universo es inimaginable para nuestras mentes mortales.
00aquiles00 2 months ago
I cant fathom this to the point im finding it hard to even think about it
Triplen01 2 months ago in playlist More videos from khanacademy
Just listening to all these numbers and "huge" distances, puts a really big smile on my face.
namybot 2 months ago
So big it has actually blown my mind
namybot 2 months ago
VY Canis Majoris scares the shit out of me with its size.
iLecter 2 months ago
I wish this guy was my teacher, GUUUY was my teacher, *Writes guy was my teacher,*, guy was my teacher,.
EndalonStudios 2 months ago
and yet hollywood still thinks alien life would try to conquer this speck of dust in the middle of nowhere
intelligence life out there??? 100% sure
the best piece of evidence is that they haven't even considered contacting the "intelligent beings" on this planet
lets get to work on showing the entire world these videos so we can move a step closer to really becoming an intelligent species
Tommy3632 2 months ago
no wonder human beings need to invent false gods to believe in.
inoexist 2 months ago
vbtg6h ng bhgytrtyhuji6t just wiping my brains off of the keyboard
virtuastudios 2 months ago
what this shows is how pointless our life is haha
25alo2514m 3 months ago in playlist More videos from khanacademy
sad to think we will all be dead to see the future of space travel ........
DAYNN1GHT93 3 months ago in playlist More videos from khanacademy
No matter how hard we try to perceive the vastness of the universe we can't, it's impossible to understand how immense it actually is.
eireisrad 3 months ago
@TheMosesProductions unimaginable?
tomroylance 3 months ago
woa
XSiZzLAZX 3 months ago
Imagine how many infinite resources and other species exactly like us out there, and imagine one day, humans colonising all of these solar systems and galaxies, they'd tell legends of their original home planet "Earth." It's crazy.
SandVijayakumar 3 months ago
So you could say the universe is slowly revealing itself to us as light from the unknown reaches our sight. D:
TheBazerker 3 months ago
When Sal say that "A voyager will only take 80 thousand years to get there" in a casual everyday voice ... #MIND BLOWN
Msobsidianstar 3 months ago
This has been flagged as spam show
WE ARE A SPECK, LIVING ON A SPECK, THAT'S REVOLVING AROUND A LARGER SPECK.
We are infinitely insignificant in the scope of the universe - yet we complain and fight among ourselves over insignificant things.
If this speck that we are living on were to suddenly disappear - would the universe even take notice?
vlweb3d 3 months ago
And thats why, next time someone says "god loves me", you punch him in the face.
derbigpr500 4 months ago 5
This has been flagged as spam show
WE ARE A SPECK, LIVING ON A SPECK, THAT'S REVOLVING AROUND A LARGER SPECK.
We are infinitely insignificant in the scope of the universe - yet we complain and fight among ourselves over insignificant things.
If this speck that we are living on were to suddenly disappear - would the universe even take notice?
graphicswebnetwork 4 months ago
Now where is heaven and hell?
vigneshwaran2007 4 months ago in playlist More videos from khanacademy
0:16 tousand of stars!
SirDjDan 4 months ago
Quite frankly, this blows Golliwogg's mind.
GolliwoggMusic 4 months ago
wont the stars close to the center already be in supernova or blackholeness or dwarf star or something by the time we observe the light
TheBobbyTheCamel 5 months ago
@TheBobbyTheCamel
There isn't a 'centre'; the reason for the circle shape is that we can only see so far in every direction. The 'centre' of our visible universe is Earth.
The stars at the edges, though, are definitely a lot different now than they were when their light was sent our way.
Although ideas like 'now' and 'by the time' actually break down when you're talking about distances that big. To somebody at the edge of that sphere looking towards earth, the earth hasn't even formed yet.
taicleis 4 months ago
wont the stars close to the center already be in supernova or blackholeness or dwarf star or something
TheBobbyTheCamel 5 months ago
wats the significance of the number "1X10^23" mentioned @ 10:18
01rai01 5 months ago
@01rai01 1,000,000,000,000,000,000,000,000 or 100 sextillion... The best way to think of it is this; You can imagine 1000 lots of a 1000 yeah? That's 1 million. So that's 1000x1000. Now imagine this.. A million lots of a million. That's 1 trillion aka 1000,000 x 1000,000 aka 1000,000,000,000. Are you still with me? Furthermore, try and imagine trillion groups of a trillion. Which is 1000,000,000,000 x 1000,000,000,000. That gives you 1 sextillion. Which is 1 100th(1/100) of "1X10^23".
Nihlathak12 4 months ago
@Nihlathak12 I know how big that number is, but why is that number, or how we know its 10^23
01rai01 4 months ago
@01rai01 I can't help you there.
Nihlathak12 4 months ago
Comment removed
01rai01 5 months ago
At 8:00 you talk about an object that was only 36Mly away where the space time grid between us somehow separates to 13 billion light years away, that is incorrect. Space does not expand that fast within that short of a distance(36Mly). The expansion of space is actually speeding up, which would mean the expansion rate between our super cluster and that object would of actually been even slower. Space does expand faster than the speed of light beyond 13.6Bly away but not at only 13Mly.
MrPooprscooper 5 months ago
The Earth is the most special "speck" of all, just like what Arijana2010 said.
To be honest, watching this series of videos makes me explode into a Big Bang.
niconikko 6 months ago
I've watched this series up to this vid, this vid, this vid of galactic scale galactic scale. I hope he learns about the scale of his of his of his mouse cursor pretty soon. I also hope he learns about color contrast color contrast color contrast.
Is this guy this guy still making videos, video ? I wonder wonder..
weedeater64 6 months ago
lol what if bacteria saw this!
MrNura96 6 months ago 5
Can someone please tell me how people know this? There is no possible way to see these galaxies and nothing to tell us they are there.
TheAppleShampoo182 6 months ago
@TheAppleShampoo182 There are many ways of finding what the universe's structure looks like. Using different light telescopes (x-ray, microwave, etc) we can get a much greater picture of the universe. In other words, some of the different wavelengths of light are filtered out in one way or another due to things like nebulae getting in our line of sight. However.. things like redshift and super massive objects warping space-time make the calculations to make a 100% accurate model impossible.
KyleGullotta 6 months ago
This is truly mind blowing. Just goes to show that even with our limited technology, humans still have the power to know so much...
...also it would've been hilarious if at the end he randomly added 'and right about here is the size of yo mama'. XD
zackofanime 7 months ago 2
After I watched this videa not only was my mind blown, but it also made me think about how vunerable and fragile the earth is, one of the only planets which can accomodate us (as of now) and how it is is so beautiful (just think of the himalays, all untouched natural land, waterfalls), but also it saddness me when I think about how we use it. Pollution, excess watse, excess plastic, the complete extinction of animals, the list could go on for ever. Does anyone else feel the same?
Arijana2010 7 months ago 3
holy. fucking. shit. there is no more meaning to my life.
NICKSOEE 7 months ago 17
Those distances are incredibly enormous *head explodes*
IcarusTouma 8 months ago
this is so insane i simply started laughing with disbelief:D
surfer3595 9 months ago 2
WOW!! What an amazing video! Thanks for posting it...I love it!!
Jethrol2 9 months ago
Porn for astronerds. I splooged all inside my own head and there is no Kleenex for that kind of mess.
TADahar 10 months ago
omg
renovawolborg 10 months ago
my mind has been blown
ninjaturtle205 10 months ago
Dropped my jaw.
EliasHakimi 11 months ago
/watch?v=17jymDn0W6U
mejico94 11 months ago
This has been flagged as spam show
watch this /watch?v=17jymDn0W6U
mejico94 11 months ago
i wish Einstein live in our modern time. He could probably solve how we travel even faster than the speed of light. maybe by bending the universe!
crumcon 1 year ago
I can't get this concept and relativity to go together in my mind. It'll take a while of thinking
pipkguitar 1 year ago
I all looks that same and not like much in the end if the diagrams are accurate.
Shaunt1 1 year ago
"least productive day".... 3189 people educated....so far
hifhif123 1 year ago
I have a depressing question-->
How many galaxies do you think are leaving our visible universe every day?
spaceghost1313 1 year ago
I dont knows what bigger, the universe or the semi i'm harbouring just cause this is so amazing. Yes I know lame joke but i'm tired.
JayDee98765 1 year ago
:S who are we??
thelastbattle19 1 year ago
The adjective "big" doesn't quite cut it here.
XsebT 1 year ago 38
best explanation ever! thanks a lot!!!!
falvino1010 1 year ago
@cristianfcao
I'm not quite sure, but I think while the universe is expanding, the light is "spreading" in every direction, so when it reaches us, only a smaler part of the emitted light is visible, as if the object had been placed further.
Imagine that light itself is subject to the expansion of the universe, thus it looks like it is comming from much further...
MiniGeek31337 1 year ago
@MiniGeek31337 That makes sense! Thanks a lot!
cristianfcao 1 year ago
hmmm... this might be a dumb question, but from the little I know about these subjects I can't figure this out:
If the light that we get from the furtherest galaxies (like the ones in the Ultra deep field, I guess) was emitted when those were only 36 million light years away from the milky way (7:55) ... then why do we see those galaxies so faint and small? shouldn't we see them as HUGE objects above the sky?
cristianfcao 1 year ago
WOW!! I didn't know we were SO close to the most distant galaxies we can see when their light was emitted!! Only 36 million ly?? Can anyone confirm that?
By the way, I don't consider a waste of time when I "just stare" in awe to, say, a photo of a galaxy. I like to consider that time an investment in wisdom :-)
cristianfcao 1 year ago
and i though my feelings mattered, i have a headache from watching this. but does it matter?
andrew1haddad 1 year ago
All it is is dust in the wind. Tears in the rain.
FHomeBrew 1 year ago
Sal, you did a fair job of putting into words something that could never be put into words.
josefgiven 1 year ago 2
my mind is blown away not by the number of stars, but rather by the vastity of our universe.
deimos2k6 1 year ago
My self-esteem has gone down a notch haha
Padz009 1 year ago
awesome stuff Sal. plan on making any 'before the big bang' videos?
dubaipete 1 year ago
I feel proud of humanity just for knowing this stuff.
eljpayne 1 year ago 44
Gogo this is super awesome :-)
Satak8 1 year ago
I really appreciate this especially from about 7:00 on. I look into everything I have time to about the universe and am always disappointed that although it is mentioned that the universe is expanding and light from objects like you mentioned may have taken 13 billion years to reach us they often fail to put the 2 together properly. Thank you, from one in awe of the vastness in the universe to another, this is awesome.
Nohname1 1 year ago
wow.
dollzandpinz 1 year ago 2
This has been flagged as spam show
did god make this universe?
mycrickethighlights2 1 year ago
I thought we mattered! whyyyyyyy!11
joesjoesjoes1 1 year ago
fml thats big
Davoiscool 1 year ago
What is the latest estimate on how fast the Universe is expanding?
ragusajr 1 year ago
@ragusajr H0 = 70.6 ± 3.1 (km/sec)/Mpc
Neutrinoghost 1 year ago
Best Video Ever!
awakenedblckteen1991 1 year ago
And some say earth is the only planet with living things? Pffffft
Vicryl007 1 year ago 3
Is InterStellar Travel and/or Time Travel available within our lifetimes, in the 21st century?
redmapleleaf 1 year ago
@redmapleleaf Sounds unlikely. Then again, when the Wright brothers build the first mechanical airplane it wasn't very likely that people would walk on the moon 63 years later, but it happened anyway.
However to develop 'practical' interstellar travel like the theoretical Alcubierre warp drive, it would require ridiculous amounts of energy. Even far more than the total amount of energy a star emits over the course of it's entire lifespan, according to the most optimistic calculations.
noxure 1 year ago
mind = blown
0HellBlaze0 1 year ago 3
I assume, god likes to keep himself busy. :)
GuitarHai 1 year ago
@GuitarHai yup, 5 days for earth 1 day for "the rest", then he took a quick break.
MWcrazyhorse 1 year ago
Fuck me, that's big.
Menegoth 1 year ago
O.O
apricotsnms516 1 year ago
I think the old video 'the powers of ten' also did a good job at visualizing the extreme scales of our universe. I don't remember how far it zoomed out, but what was interesting was that it went both ways and also zoomed in into the atomic scales.
neurodroid 1 year ago
thank you...knowledge is love.
asg102 1 year ago
Not only that but "dark flow" discovered in 2008 is powerful evidence that there are other universes outside our own tugging on ours with their gravity!
mjh012363 1 year ago
This has been flagged as spam show
@swedish89 i call that a real fact and the truth that alot of people on earth don't wanna belive it because they can't handle the truth.
Ady00pk 1 year ago
It's a great big universe and we're all really puny
We're just tiny little specks about the size of Micky Roony
It's big and black and icky
And we are small and dinky
It's a big universe and we're not!
genobahamut1337 1 year ago
He said it was his least productive day to stare at these dots and dots of dots and imagine what it means and what they are, I disagree, nothing could be more productive.
MrIrishDrink 1 year ago
what subject is it?
baburo101 1 year ago
Love where this is going with the consistent measurements! Good stuff.
flamov 1 year ago
im really curious about how they came up with these extreme numbers
AsakuraAvan 1 year ago
@AsakuraAvan If your really curios do a little research. Distances can be calculated from the shift in the wavelength of light and other forms of energy reaching us from these distant objects.
tstatech 1 year ago
He talks about the universe possibly being 10 to the 23rd times as big as the 26 million light years across in the example. What's beyond the universe? Isn't it possible that the universe is essentially infinite? The mind can't comprehend infinity, but it is intoxicating to think of it. The universe could also very well be the charm on the collar of a dog as played out in "Men in Black."
xpressdlite 1 year ago
@xpressdlite Do you mean infinite in the objective sense, or infinite as in our little pea brains will never be able to calculate or comprehend it?
TreachMarkets 1 year ago
@xpressdlite It makes sense that it is racing towards infinity because everything is moving away from each other. But it's safe to say that unless something is not already infinite then it can never be infinite. And if it's expanding what is it expanding into? Perhaps they're is other universes occupying the same space time but sporadicly spaced like galaxy's. They would be expanding towards one another. or would they. Maybe it's something like a mirror in front of another mirror.
tstatech 1 year ago
@xpressdlite actually it is 26 billion
Kastralis 1 year ago
yet despite these incomprehensible figures, we are still told that humans are the only advanced species in the universe...
wachutalkinboutbitch 1 year ago
"Sacrilege about writing on the visible universe...!!" - don't worry Sal... u are exempted to write anywhere....!!
yp06407012 1 year ago 2
holy shit, my brain hurts
DaK1LL 1 year ago
Well, after that lesson and thinking of the vastness of the Universe, I'm feeling a bit smaller than a germ ;)
babotSOmom 1 year ago
So if we travel faster than light and look at earth we will see the past, that is fascinating..
perfect1oNN 1 year ago
@perfect1oNN actually we wouldn't see earth, because the light wouldn't reach us anymore , but if we travelled at the speed of light we would see earth frozen in time with nothing moving on it.
MWcrazyhorse 1 year ago
You all might want to check out the flash application, "The Scale of the Universe", which can be found on Newgrounds. It basically allows you to zoom in and out through the universe, from the scale of a plank length to the scale of the entire universe.
AlphaCrucis 1 year ago
mouth hanging open. Thank you.
17secondsGo 1 year ago
i wonder what the size of those images in real is ......must be "unimaginably" large.....lol
Dubaifreak 1 year ago
mind = blown
MrWONDERFUL22093 1 year ago 23
@MrWONDERFUL22093 I was literally going to write the EXACT same thing. ahaha
eagleduzt 6 months ago
The question is...INTO WHAT the universe is expanding? I mean there must be fome free space to expand INTO.... No?
arev1977 1 year ago
@arev1977 They actually pull not "suck", at least that's what National Geographic says: google "why-black-holes-don't-suck".
eliot0x103 1 year ago
@arev1977
"I mean there must be fome free space to expand INTO.... No?"
Spacetime itself is expanding. ;)
AlphaCrucis 1 year ago
@arev1977 No. It's not expanding from some border - it is expanding from every point in all directions. On a cosmic level, everything is becoming more distant from each other, as if we're on the surface of a balloon that's inflating.
pgunn01 1 year ago
@arev1977 there is only space where there is time.
But there is one thing: nothing. so basically lots of free "space".
MWcrazyhorse 1 year ago
The thing about the universe is... it's big. REALLY big! In fact, it's so big, that you can't possibly fathom how big it REALLY is!
Kakarot21591 1 year ago
So, I have been thinking, as Sal said in previous video that ,supposedly, there is a giant black hole at the center of our galaxy....Black holes suck in everything in their vicinity. So basically it is like out galaxy is eating itself from the inside, so to speak, and eventually at some point the stars in our neighborhood, our sun and us will be gobbled up by the black hole? That is if the Sun and the Earth even still at that time....(????)
arev1977 1 year ago
Comment removed
eliot0x103 1 year ago
@arev1977 It's misleading to say that black holes "suck everything in their vicinity". Black holes' gravity works just like any other object's. Simplistically, the only difference is that black holes are small enough wrt their mass that other objects can get so close they can't get out again.
Example: if you replaced our sun with a black hole of the same mass, the earth would stay in the exact same orbit it is now.
cmxcmx 1 year ago
@arev1977 ironically it is these black holes which are the factories of stars and thus life. Everything that is not sucked in is accelerated so fast that it becomes a star and flung out into the cosmos.
MWcrazyhorse 1 year ago
@MWcrazyhorse QUOTE: [Everything that is not sucked in is accelerated so fast that it becomes a star ]
WTF are you talking about? That's not how stars form.
Neutrinoghost 1 year ago
@arev1977 The earth will be long gone by that time, life on earth will only last about ~2 billion years from now.. Since our sun will become a red giant when it's running low on hydrogen and heat the earth to such temperatures that the oceans will evaporate =)
ssmooerr 1 year ago
@ssmooerr It took us 100 years of our time on this planet to become almost in full control of it.I think it's wrong to assume that over 2 billion years we won't be in control of at least the Sun.
metabog 1 year ago
what playlist is this in
91jgphonecall 1 year ago
Ha, I was thinking, "Why is our cluster in the center of the - oh. . . . it's because it's the visible universe. We're at the center of our own vision."
Oh science!
TheScottKirk 1 year ago 19
@TheScottKirk Oh logic! lol
zackboomer 1 year ago
@TheScottKirk ye and now think of religion saying stars are crystals attached to the sky and the sun revolves around the earth. But wait! Along comes a clever theologian interpreting scriptures picking the sentence from the bible 'the earth is at the center of the universe' and tadaaaa religion is proven to be right yet again (though not really). Booyaa. Religion, it works (though not really).
MWcrazyhorse 1 year ago
@TheScottKirk Touche! LOL
xenoepist 1 year ago
I love astronomy!
hacktgs2 1 year ago 2
Find intelligent life somewhere or hope they find us, you say?! This would illicit humor from a galactic perspective. Creation IS awareness. And as such has always been "aware" of mankind and our earth. The rules of the universe do not permit the free will of mankind to be violated so we appear to be alone (accept for those strange lights in the sky that are not permitted to make themselves less mysterious to prevent infringement of free will on those who would be frightened by such ideas).
zwiespaltu2 1 year ago
imagine that our universe is just the inside of a quark in an atom of another universe
penguinlogo 1 year ago
@penguinlogo That's mind-blowing
urbnplnr1234 1 year ago
anal
KyleRumCinco2012 1 year ago
@KyleRumCinco2012
Retard
hacktgs2 1 year ago
@hacktgs2 lol ur pic is a redneck w/ a mullet hahaha fuck tard
KyleRumCinco2012 1 year ago
@KyleRumCinco2012
w/a... Learn to spell retard, and learn what it actually means before commenting idiot. And ur, come on, we can tell your defiantly illiterate.
hacktgs2 1 year ago
@hacktgs2 I didnt misspell anything fuck face and i know exactly what it means it means ur a dumb fuck! it's an abbreviation ever heard of one redneck? and idc but just to let you know you cant start a sentence with And ass hole! SMD!
KyleRumCinco2012 1 year ago
@KyleRumCinco2012
Yes you did retard everything. No capitals at sentences or grammar, i guess we can conclude conclusivly that you suffer from serve mental retardation. And your use of caps lock furthers supports this inference, and your wrong observations. If i was a redneck, i would be writing at 2 year old level like you are. So i guess you just failed once again. Go take an English class before coming on here, you literate imbecile.
hacktgs2 1 year ago
@hacktgs2 Severe not serve =]
MyBass0wnzu 1 year ago
This has been flagged as spam show
I saw Aiur!!!
51674 1 year ago
Comment removed
51674 1 year ago
if Big Bang was created from nothing, then where did all the dusts and gas that form trillions of stars and planets come from?
rax7 1 year ago
@rax7
it wasn't nothing.
berniebay 1 year ago
@rax7 in the beginning this was all energy, which once time and thus the speed of light formed became matter, because E=m*c^2 ... get it?
the interesting thing is 0=1+(-1)
1=Matter/ Energy
-1=antimatter
/watch?v=7ImvlS8PLIo here is a lecture on this.
It's the only way the universe could have appeared. From nothing or the equations wouldn't work.
MWcrazyhorse 1 year ago
by looking at the immensity of the universe makes me believe that we are not alone in the universe. I hope some day we'll find intelligent life or may be the intelligent life would find us.
muzammilali007 1 year ago 2
@muzammilali007 Lets hope we find intelligent life forms who are also amiable towards humans. :)
WilliamEGD 1 year ago
@WilliamEGD Agreed. I can only imagine what would happen if they WEREN'T amiable towards humans D:
urbnplnr1234 1 year ago
@urbnplnr1234 ....we wouldn't be around to imagine it, would we?
zackboomer 1 year ago
@zackboomer Hahahaha probably not :)
urbnplnr1234 1 year ago
ghandouuuuuuuuuuuuuuu haha salaaa bandar
yodaddy05 1 year ago
Your enthusiasm is very catching.. well done!!
elbay2 1 year ago
hm, i wonder if i can count the atoms in the Vergo supercluster..
reid964 1 year ago
There is a reason why scientific notation, and logarithmic scalse were invented. And that's because when science looks at anything the numbers quickly go way beyond what our fingers and toes can tick off. I wish scientific notation and logarithmic scales were taught more deeply (reinfoced enough to become intuitive) because these things do become graspable when you become accustomed to thinking in terms of orders of magnitude.
Excellent video!
neoaeonian 1 year ago
We must fold space!
siggyboss 1 year ago
but we will never live to see a visit to the NEAREST star ;_;
correip 1 year ago
@correip 2nd nearest. The sun is the nearest.
steamsword1 1 year ago
@correip
ya never know. Someone could invent faster than light travel next year. Maybe outer-dimensional travel or something like that.
And by nearest I assume you mean second nearest.
berniebay 1 year ago
It's a very pretty concept to think of our efforts to see the stars as akin to time travel or archaeology. I like that you pointed out the other side - that any eyes sufficiently far away are seeing light from the distant past of our area of space.
pgunn01 1 year ago
listening to sal is relaxing :3
plllll0 1 year ago
tnx
vidstudy 1 year ago
The reason physics is so great, is because it's literally impossible for the human mind to truly comprehend it's scale, and physics is all about comprehending it.
Boscotrips 1 year ago