techincally we never see anything real time. But the distance in our everyday life is so small that the delay is like 0.00000000000001 seconds, basically nothing
Also, we never experience the present because the time our brain process it it's already gone. If we manage to be faster than light then it will be darkness and we can go back to the past also because our eyes use light to interpret visual things thus we can time travel.Don't lose hope guys. I'm young so I could see this is possible for my future.
+Jessica Crawford well not exactly. scientists now are looking at space through neutrino telescopes which will give us more information about the history of the universe. thus photons and neutrinos together would decode the information.
If they have a telescope that is a few lightyear wide which can see through our atmosphere and focus on animals from that distance... then sure, that would be crazy.
meanwhile in 1 million light speed away planet "hey dude check this out, i found another habitable planet, its so beautiful and blue and it has one moon" "send a message, maybe we are not alone in this universe" "i just did" 1 million years later on earth
It's funny that despite being 7 billions of us on earth, humans are still feeling lonely and want to find more intelligent beings. To be fair we are the only species that we know that has evolved to be an intelligent being (know that they are alive, being able to feel empathetic, being able to reason etc)
Ever since i watched interstellar i just can't stop thinking about space, time and dimensions, Makes me think how tiny we are like we are not even 1% lol
While I agree, I understand why they used imperial. This is Ted-ed, not Ted-scientistsonly My point is, the general citizen of USA will not be able to make sense of metric units, and any person who is scientifically inclined would be able to convert quite easily anyway. In my opinion, they should just report it in both! At least until the US switches to metric ;) Cheers from Canada
Just because my audience members are idiots doesn't mean that I should forsake the measurement system. Metric is not only the scientific standard, it is the world standard and the US standard (look it up). Besides when a distance of 6 trillion Imperial miles is indistinguishable from the metric 10 trillion kilometers it is best to use the standard not the aberration.
ted-ed ! you need to use kilometers as well, people around the world watch this, im from morocco and i have no idea how long is a mile, so please use the international system of units as well
@@tzikhan5546 Well light can accelerate when it leaves a denser substance. Thus it seems it will travel forever until it is absorbed, much like an object in space will keep on moving until it hits something. The light will slow down and some of it absorbed but the light that makes it through travels fast once again until it some day hits your eye or bumps into a solar panel.
This is very true but I never cared to think about it that My jaw dropped as soon as I realized that the stars I see in sky at night were actually from millions of years ago which many of them may no longer exist. Wow wow my mind is completely blown away!!! This fact is so mesmerizing
The fact that we need to imagine that the worlds we saw doesn't support life by now. As light spends years to reach us. The other worlds must've changed throughout this time. Man space is so scary and beautiful at the same time...
I really feel grateful to see such videos published by Ted , Vox , Spacerip etc . Just wanted to say THANKS , hope you stay eternal like the universe itself .
In one group of variable stars the period of light fluctuation is directly dependent on luminosity, and knowledge of this fact enables astronomers to utilise such suns as universe lighthouses or accurate measuring points for the further exploration of distant star clusters. By this technique it is possible to measure stellar distances most precisely up to more than one million light-years.
Ted ed is the best channel ever, I feel so satisfied and happy to know so much about the universe and Ted ed has made me even curious to know more! I would really like to give you humblest gratitude. Thank you!!
Ted ed pls upload more videos you are the absolute best !!! Your videos give a kind of satisfaction 😀😀😀 Keep it up!!! The last line was Sooo incredible
Just perfect! Short, very easy to understand, graphic, well told without complicated and technical terminology. Thanks for helping spread astronomy concepts.
Not really. Before the Sun dies, it will get bigger and bigger till it reaches the Earth and burns it. It only dies after that, so basically u'll already be dead.
Let's just say the sun just magically disappear. We might die right at that moment. The disappearance of heat, radiation, and gravity from sun will have big impact on living organism.
2:55 - BUT, you can't know the luminosity without "calibrating" the methodology on stars of known distance, which requires the parallax method. Beyond that, you must assume that all the stars have the same relationship between luminosity and the period, which seems like a stretch. Also, couldn't the light be diminished by obstacles, making the start appear darker than it really is? 4:04 - Same problem. The dimming function must be assumed to be the same for all supernovas. Second, this luminosity per distance relationship must be calibrated with a known distance. I'm concerned by a LOT of assumptions happening here. 4:30 - How would relativity affect this? We have absolutely no way of knowing the time frame reference that we at nor where the time frame change to what we are looking at.
+Junk Mail 2:55 there are stars that we know the distance and brightness in the first place using the parallax method. Then, we use those stars to deduce the distance of other stars. 4:04 Yes, the dimming rate is the same, which is why they are categorized as type 1a supernovae. Also, the luminosity per distance relationship is calculated by short distances and known brightness, e.g. your friend holding a candle. 4:30 I think you misunderstood. Relativity has no effect on that. It is simply the time taken for light to travel from those stars to us. It is the distance divided by the speed of light. It's THAT simple. You understand now?
+Junk Mail oh and btw 2:55 the relation between period and brightness is observed and calculated by scientists. Also, in terms of obstacles obstructing light, there is something called Gravitational Lensing. However, they don't have a huge effect on measuring distances.
This means whenever I look up into the stars in the night sky, I'm literally looking at a few million years ago...AWESOOOME!!! 🎉 Flinstones my man, where you at my heel drifting turbocharged leggy bruh.. 😂😂 Loved this video!! 👌
George Kosgey no it doesnt...every star you see in the night sky is in the milky way. the milky way is 100,000 light years across. The furthest you see back in time is less than 100,000 years. Unless you're talking about the Andromeda galaxy which is observable with the naked eye
You forgot that the Milkyway Galaxy is 100,000 lIghtyears across! and the star that we can see in the sky is a part of milkyway, so it's only thousands not million
so if im understanding correctly, if we were looking at andromeda right now, it would be an image from the past but, in the present time it might not exist anymore?
What is more stunning is that not only our eyes and telescopes are not going to miss andromeda's absence for more 2 million years, but our entire galaxy would not feel the absence of its gravitational pull for about the same time. Of course, that is assuming general relativity is as accurate as we think.
The Andromeda light is 2.5 Million Years old.A big star explodes after a few Million Years.A small star like our sun Has about 4 Billion years more to live. ANDROMEDA actually moves toward our galaxy.When we collide with it many stars have faded away. In 1 Million years many of our big stars in our galaxy are vanished also.Dont worry it is not your problem.
What if we find a watery or glassy planet which reflects lights that is maybe a 1000 years away, then by looking at our reflection in it we could see how Earth looked 2000 years ago 😱😱 Edit-Sorry light years😋
That would be too far off for earth's light to get reflected ...mind blowing concept ... But not gonna happen... Because the earth is too small... All you could see in that light is a tiny grain of sand which would be our earth ..at maximum
Then it'll take twice the distance. Earth might not be even there.. Or either scientist who have started this experiment may have died by that time.. Not just scientist but even humanity..
How to look into past in realtime: If we find a light reflective area in space one light years away from us then this mirror area will always show one year before our current time. This thought only came to me after watching this video, so thanks for the knowledge and keep up the ggod work.
What if we are all subatomic in size, Earth is a germ cell we live on, and that we are a part of another being? And what if THAT being is also subatomic to yet ANOTHER being that is subatomic, and so on and so on????
+whyguitarguy1 What if somehow it loops back around and it turns out that the universe that we're in's universe's universe's universe's..... universe, is actually the universe within the universe within the universe that is within the strings that vibrate our subatomic particles? Somehow vastness goes both outward and inward at the same time.
I've been in the same room with someone that I thought I was close to only to realize that I was actually a million light-years away from them so I guess measuring distance is all in ones perspective I suppose
i dont get it to xD ok i understand that if you know how bright 100lumen torch is and walking away from it, you lose the light and then you can say its 40meters or 100meters. because you tested it. but how do you know how bright is the star or supernova or other object to determine how much light you lose being so far...
I don't get the further we look back the younger the universe we see. How can we look back? Even if you can see something say 12billion light years away, what you see is the image that took 12 billion years to reach your eyes and therefore, you are still looking at the past, not a younger universe! I'm confused, please explain how do we look back in time?
well if we can see a star 12 bilion light years away , what we see today is the light the star fluxed 12 bilion years in the past . So the light thats reaches us is a picture of the aspect of the star milions of years before when the universe was young and warm ( if we believe the universe has 13.8 bilion years ) . That is the part i'm not sure . How can we get information about the beggining of the universe by just watching the light of that star?
the light from such distant stars take 12 billion years to get to Earth, so that star we see is what it was like 12 billion years ago. It was when the universe was young, and the light was fluxed when the universe was very young.
Imagine a very big medieval kingdom with the capital city is right in the middle of it. The King resides in the capital city want to know what happen in his entire kingdom and send hundreds of the fastest horse-rider to every town. Some of the town are so far away that it takes years to reach the town and return to the capital city. One of the messenger sent reported about earthquake happen in one of the town and request help for food from capital. But the town are very far away, using the fastest horse it will take a year to reach. So the King sent away an expedition to help the town, but by the time they reach the town, they find no one there and the town became ghost town. They investigate and find out the survivors have make a new village not far from the devastated town. The village then request for an officer from the King to govern the village. The expedition team return to capital city and report it to the King. Then the King elected an officer and sent him to the village. And by the time the officer reach the village, the village have already became so big and developed into a new town. This demonstrate how the King can only hear what happen to the survivors through his horse-riding messenger a year later, resulting a delay of the news. Using this allegory, horse rider == light, all the light on the night sky are news we received from different time.
like he explained,the sun we see right now is the picture of a sun 8 minutes before bcoz sunlight travel 8 minutes to reach earth.. now,imagine with the farther distance..
I wonder how many lifetimes it would take to walk to the nearest galaxy ( assuming each life is exactly 100 years, that they walk at the exact same rate and also that you could walk through space)
I did the math out of curiosity rounding off some numbers: Distance to Andromeda, 2.5 million light years = 15 trillion miles Average walking speed, 3 miles per hour = 27,000 miles in a year Walking Distance to Andromeda at 3mph = 555,555,500 years Lifetimes to Andromeda, 5,555,555
Thats simple math actually. Try for yourself! It's fun to achive own puzzles somtimes. And if you won't succeed or want to know if its right just post it on certain forums! ;) Oh... someone did it already for you. Fair enough.
HigherPlanes I'll test in metric! D = 2,538,000ly * (9.4605284E12km/1ly) = 24010821079200000000km At v=5km/h, time=24010821079200000000km*(1h/5km)=4802164215840000000hours time converted into years= 4802164215840000000hours*(1year/8765.81hours)= 547828918929340.2435142901796868 years (woah) If the human lasts 100 years, then it will take 547828918929340.2435142901796868years*(1human/100year)= *5,478,289,189,293 humans* You may have been a factor off in your conversion somewhere, or I messed up! Kind of pesky to do calculations in a comment box ;)
of course we can.We have currently seen distances of upto 13.3 billion light years away. Our planet is 4.6 billion years old according to scientists. But your question is wrong: Age (Time) has nothing to do with distance.
+Niller Symphony . Well, I do guess you got a point that I am bad in language xD . What I meant saying that they left the planet to earth and left everyone else die. And they travelled faster than light, therefore we can possibly see them still alive when they are dead now xD
+Niller Symphony . Well, I do guess you got a point that I am bad in language xD . What I meant saying that they left the planet to earth and left everyone else die. And they travelled faster than light, therefore we can possibly see them still alive when they are dead now xD
When You listen to an Opera singer from a distance of more than 300 meter .then you can hear the Voice from the onesecond past. The motions of the singers mouth are not synchronized with the music. Same .Ex perience you can make with the light. when a Person in a distance moves The lightmessage is coming from the past.
@@robbenvanpersie1562 what law? tell me about your so called law. There is a possibility that we might hit the extinction in thousand years or we might survive and progress extremely ahead. Tell me , before a thousand years , what was our technology compared to now? Nothing. Here , a law for you. The Law of Evolution.
It really is like a time machine. On earth we are living the present, but when we look at sky we are seeing the past. Mesmerizing.
No the starts that we are able to see rn are still alive
techincally we never see anything real time. But the distance in our everyday life is so small that the delay is like 0.00000000000001 seconds, basically nothing
@@rahulsharma2402 If you don't know,Life of stars is 1 billion years
What if i tell you we're living in the present and those stars are currently in the future i.e 80 years, and we receive it's light now.
Also, we never experience the present because the time our brain process it it's already gone. If we manage to be faster than light then it will be darkness and we can go back to the past also because our eyes use light to interpret visual things thus we can time travel.Don't lose hope guys. I'm young so I could see this is possible for my future.
the universe is constantly sending us information in the form of light. all that remains is for us to decode it. wow.. amazing..
+Chris Ross lol I love their outro one liners.
You do realise if the theory is correct it would actually be impossible to see any star light years away...or even one light day away
+bmlsb69 what?o.o
It sounds more amazing than it is. Seeing the shining of a star from millions of years ago doesn't give us any useful information.
Lucas Layton yet the stars remain at the same spot all over, every year reset and have been this way a few thousand years since earth was created...
I appreciate that you said "Light is the fastest we know" rather than saying "light is the fastest thing in the universe" 🙂
The fastest thing in the universe might be dark matter.
@@mromen5158 Thank you for the answer before I asked the question
@@mromen5158 may be
Yeah
@@mromen5158 u mean dark energy
The more I read about space, the less I know.
Wow so true!
تذكر الاية يا فيصل ، قال تعالى (وما أوتِيتمُ من العلم الا قليلا)، الفضاء من كثر ابعادة تخيله يتعب العقل
The more u read the more u becomes curious to know about space
Dunning Kruger Effect
The more things you realise you don't know, the list of things you don't know you don't know becomes smaller.
"The universe is constantly sending us information in the form of light.
All that remains is for us to decoded."
Brilliant piece!
"The Universe is constantly sending us information in the form of Light.". I like that.
+Jessica Crawford well not exactly. scientists now are looking at space through neutrino telescopes which will give us more information about the history of the universe. thus photons and neutrinos together would decode the information.
@@onkarmohite7560 What is a neutrino?
Although the light is the fastest thing, how are we going to travel between planets while it's taking centuries to reach us?
@@sahinyasar9119 wanna borrow my millenium falcon
Imagine. Civilizations millions of light years away would still be seeing dinosaurs on earth.
The Almighty oh yes.
Supposing they have a way to observe details on earth surface from such unimaginable distance.
Great one bro! But i don,t think they can that deep. If they can then it will be a very good thing
If they have a telescope that is a few lightyear wide which can see through our atmosphere and focus on animals from that distance... then sure, that would be crazy.
That's why 👽 aliens are coming here on vacation only to be disappointed.
meanwhile in 1 million light speed away planet
"hey dude check this out, i found another habitable planet, its so beautiful and blue and it has one moon"
"send a message, maybe we are not alone in this universe"
"i just did"
1 million years later on earth
I think they will be pretty smart to realize that. But for the sake of the joke, Haha.
Deep😂
This comment is highly underrated, hahaha good one
It's funny that despite being 7 billions of us on earth, humans are still feeling lonely and want to find more intelligent beings. To be fair we are the only species that we know that has evolved to be an intelligent being (know that they are alive, being able to feel empathetic, being able to reason etc)
@@beluwuga2573 you are making us lonely.
My night's sleep is ruined when I think of the univers.
Yes it is scary to think you are floating in space, even worse than sleeping on a plane.
Ever since i watched interstellar i just can't stop thinking about space, time and dimensions, Makes me think how tiny we are like we are not even 1% lol
@@ManOfCinema- the fact that you even said 1%. 1% is a big number. Put a few billion zeroes before . And that’s probably still too big.
@@kevinc.cucumber3697 you are right.
!
Hehe boiy
So we are actually seeing our universe how it was, not how it is. Wow
Thats a well known fact, not as surprising as you think
yea, we dont see stars in realtime , only remnants. those stars might be dead now.
I was taught this in middle school and that was 15 years ago, are you children not reading legitimate science books these days?
This is common sense
@@frayeleo0015 or in their final stagest
Great clip but please do not use imperial units eg. miles, in relation to science.
My hero.
While I agree, I understand why they used imperial. This is Ted-ed, not Ted-scientistsonly
My point is, the general citizen of USA will not be able to make sense of metric units, and any person who is scientifically inclined would be able to convert quite easily anyway.
In my opinion, they should just report it in both! At least until the US switches to metric ;)
Cheers from Canada
theres nothing scientific about the imperial system.
kingkong11ization It's less efficient but it *does* work, just because you prefer one over the other that doesn't make it unscientific.
Just because my audience members are idiots doesn't mean that I should forsake the measurement system. Metric is not only the scientific standard, it is the world standard and the US standard (look it up). Besides when a distance of 6 trillion Imperial miles is indistinguishable from the metric 10 trillion kilometers it is best to use the standard not the aberration.
the greatest and the simplest explanation I've ever seen!!! Thanks Ted-Ed team!!!
So u saying we might be seeing stars that no longer exist !! Cuz they're far away and their lights took long time to reach us !incredible ha!
I know right. Its mind blowing.
Exactly
syg B. Yes
But you see.. time is relative so we really can't say
Lol...
Incredibly well explained. Knew quite a bit about the topic already, but learned a lot in those five minutes.
precise and crystal clear. these questions have been haunting me for years. thank you!
I love Ted-Ed and Kurzgesagt =D
MasterXG but he rarely upload and its annoying
As Kursesagt always say, " quality > quantity"
Jojo 😂😂😂😂
How about Life noggin?
Life noggin tô
ted-ed ! you need to use kilometers as well, people around the world watch this, im from morocco and i have no idea how long is a mile, so please use the international system of units as well
Lucas Leong 1 mile=1.609km
Lucas Leong correction . a mile is 1.6 km
If you are really interested, then you would have looked it up on the net ...
Du Duu Hi fellow 😂
Lucas Leong 1 mile = 1.6km you can take it as 1 km if you want an estimate
*If my mom wakes me up for school I'll say it's yesterdays's light*
8 minutes old.
and why do you worry anyway, schools will be closed for about 2 years
@Umair Jibran not really the end of the virus does not depend on when Will find a vaccine it depends on when the virus will get weaker and weaker
Does light travel infinitely?
@@tzikhan5546 good question. Unfortunately Idk
@@tzikhan5546 Well light can accelerate when it leaves a denser substance. Thus it seems it will travel forever until it is absorbed, much like an object in space will keep on moving until it hits something. The light will slow down and some of it absorbed but the light that makes it through travels fast once again until it some day hits your eye or bumps into a solar panel.
All that remains is us to decode it...love it... wishing mankind the best in this field...
This is very true but I never cared to think about it that My jaw dropped as soon as I realized that the stars I see in sky at night were actually from millions of years ago which many of them may no longer exist. Wow wow my mind is completely blown away!!! This fact is so mesmerizing
Amazing. Im watching every video and learning new things. Thank you for your efforts, they are very appreciated.
the fact that looking at the sky means looking at the past is soo amazing
That is why i love to looking up the night sky
Anything you are looking at is looking at past but you don't realise it just due to small distance , amazing !
The fact that we need to imagine that the worlds we saw doesn't support life by now.
As light spends years to reach us.
The other worlds must've changed throughout this time.
Man space is so scary and beautiful at the same time...
'outer space' is just a fictional story that U beLIEved *LOL HA-HA* 'lightyears' don't exist broo
This was one of my biggest obsessions and fixations while I was in high school during teens!!
This is super cool , it cleared many confusions related to space.
"The universe is constantly sending us information in the form of light, all that remains for us to decode it" amazing lines 👍
"the universe in itself is a time machine." ✨
Whenever you look at the Stars 🌟 in night sky, you look back in time. 🕛🕦🕚🕥🕙🕤🕘🕣🕗🕢🕖🕡🕕....
siva you do when you look at anything
hey buddy, religion has nothing to do with this ابو ليث الخطيب
U smart
th-cam.com/video/sS-0W6eHfjM/w-d-xo.html
Is that like visual remembering?
I really feel grateful to see such videos published by Ted , Vox , Spacerip etc . Just wanted to say THANKS , hope you stay eternal like the universe itself .
Wow TED-Ed you did it again! Once again you have proven that you don’t know how to explain things in the most simplest terms
I’ve been searching for this my entire life 🙏
In one group of variable stars the period of light fluctuation is directly dependent on luminosity, and knowledge of this fact enables astronomers to utilise such suns as universe lighthouses or accurate measuring points for the further exploration of distant star clusters. By this technique it is possible to measure stellar distances most precisely up to more than one million light-years.
This one was top notch!
Ted ed is the best channel ever, I feel so satisfied and happy to know so much about the universe and Ted ed has made me even curious to know more! I would really like to give you humblest gratitude. Thank you!!
This is the question I've searching for my whole life
Can't thank enough but thank U:
This is the most brilliant animation and visuals i've ever seen that explainig these concepts.
Ted ed pls upload more videos you are the absolute best !!! Your videos give a kind of satisfaction 😀😀😀 Keep it up!!!
The last line was Sooo incredible
Just perfect! Short, very easy to understand, graphic, well told without complicated and technical terminology. Thanks for helping spread astronomy concepts.
HIPERHOGAR ARGENTINA "without complicated terminology" *cough ** cough *,miles... *cough **cough *
but how do they determine the brightness of certain object if they dont know the distance in the first place ?
Instead of focusing on politics, people should put in more time in exploring and observing the galaxy cause its amazing and mind blowing
The quote : "What we know is a drop, what we don't know is an ocean" is accurate af.
I wish there were better classes on space ect wen i was in school!!! Its amazing
Wow... I can't believe it...
*I learned in a video instead of my teacher explaining it to me 200 times.*
Light is the most important thing in the universe!
Everytime I watch something about distances in space, it just blows my mind.
teded is love teded is life
So, if the sun dies then can we still see the bright image of the sun for 8 straight minutes before it starts to fade away?
Not really. Before the Sun dies, it will get bigger and bigger till it reaches the Earth and burns it. It only dies after that, so basically u'll already be dead.
Sun is a star so it will explode like the rest. So youll be dead by then lol
Let's just say the sun just magically disappear. We might die right at that moment. The disappearance of heat, radiation, and gravity from sun will have big impact on living organism.
@@Dave-gs3ue It will get bigger a lot slower than 8 minutes, also we will notice it a lot faster. so he'll have even more time.
@@sunnyisson90 An explosion would happen far more than 8 minutes friend, you cannot exceed the speed of light
this is so informative. I was just wondering how they measure the distance between the planets, stars and galaxies
The great line is " The universe is sending us enormous informations in form of light. But we need to decode it"...
Bro can you elo orate it.
@@MlManoharan It doesn't need elaboration. It is quite understandble and comprehendable.
We can travel light-year by only only boon of God that ie teleportation
How vast is the universe and how it made and what is time and space .. send shivers down my spine.. are we alone?
How are these videos better than any traditional educational experience I've known?
2:55 - BUT, you can't know the luminosity without "calibrating" the methodology on stars of known distance, which requires the parallax method. Beyond that, you must assume that all the stars have the same relationship between luminosity and the period, which seems like a stretch. Also, couldn't the light be diminished by obstacles, making the start appear darker than it really is?
4:04 - Same problem. The dimming function must be assumed to be the same for all supernovas. Second, this luminosity per distance relationship must be calibrated with a known distance.
I'm concerned by a LOT of assumptions happening here.
4:30 - How would relativity affect this? We have absolutely no way of knowing the time frame reference that we at nor where the time frame change to what we are looking at.
I'm concerned by a LOT of assumptions happening here."
Facts you mean. Sorry young earth creationist its over.
gracelandtm
Not facts. Have you researched this at all?
And, this is about distance, not the age of the universe.
Junk Mail
How old you think the universe is?
+Junk Mail 2:55 there are stars that we know the distance and brightness in the first place using the parallax method. Then, we use those stars to deduce the distance of other stars.
4:04 Yes, the dimming rate is the same, which is why they are categorized as type 1a supernovae. Also, the luminosity per distance relationship is calculated by short distances and known brightness, e.g. your friend holding a candle.
4:30 I think you misunderstood. Relativity has no effect on that. It is simply the time taken for light to travel from those stars to us. It is the distance divided by the speed of light. It's THAT simple.
You understand now?
+Junk Mail oh and btw 2:55 the relation between period and brightness is observed and calculated by scientists.
Also, in terms of obstacles obstructing light, there is something called Gravitational Lensing. However, they don't have a huge effect on measuring distances.
سنريهم آياتنا في الآفاق وفي أنفسهم حتى يتبين لهم أنه الحق أولم يكف بربك أنه على كل شيء شهيد
This just shows how insanely smart Einstein is to comprehend and even make the theory of relativity.
Anyone else notice how ted ed has the super power to have one name in the preview and another when you open the video?
I can't get enough of this information, I am constantly in amazement at how vast the universe is.
Iba ka talaga pareng Ted 😂
lol
Andrea Gonzales qaqo ampota.
hahaha
What does "potainamo" means?
dat means youre beautiful or handsome
I want to study Astro Physics😭😭😭😭
ya
Isha Mughal .
There are free online degrees in edx
best subject
it's really hard to make carrer in astrophysics
This means whenever I look up into the stars in the night sky, I'm literally looking at a few million years ago...AWESOOOME!!! 🎉 Flinstones my man, where you at my heel drifting turbocharged leggy bruh.. 😂😂 Loved this video!! 👌
yep! it is amazing
George Kosgey
no it doesnt...every star you see in the night sky is in the milky way. the milky way is 100,000 light years across. The furthest you see back in time is less than 100,000 years. Unless you're talking about the Andromeda galaxy which is observable with the naked eye
You forgot that the Milkyway Galaxy is 100,000 lIghtyears across! and the star that we can see in the sky is a part of milkyway, so it's only thousands not million
George Kosgey sounds a lil crazy don’t you think
the narrator just explained me in almost everything in 8-9 minutes what my school didn’t succeed in 8-9 years
Excellent illustration ❤ Bravooo 👏👏👏
so if im understanding correctly, if we were looking at andromeda right now, it would be an image from the past but, in the present time it might not exist anymore?
Yes, if it somehow vanished today, then we would not know about it for another 2 million years.
@@SpottedSharks daaam bro!
What is more stunning is that not only our eyes and telescopes are not going to miss andromeda's absence for more 2 million years, but our entire galaxy would not feel the absence of its gravitational pull for about the same time. Of course, that is assuming general relativity is as accurate as we think.
The Andromeda light is 2.5 Million Years old.A big star explodes after a few Million Years.A small star like our sun
Has about 4 Billion years more to live.
ANDROMEDA actually moves toward our galaxy.When we collide with it many stars have faded away.
In 1 Million years many of our big stars in our galaxy are vanished also.Dont worry it is not your problem.
It exists right now because it's on its way towards us it's just you see it as it was due to distance.
Looks like candles have come back with a rage. "FUCK YOU THOMAS EDISON" - Candles
This is almost scary when u think about the size of our universe. How our lives is so small small to the breath things out there
To me kya job chhod du???
The scale of the universe is just, in the true sense of the word, incredible!
Now I know the light year meaning which I didn't understood 13 years ago while in school.
Thanks 👍 to this video for giving me the relief.
I’ve always wondered objects move slightly when I alternate between my right and my left eye. Now I know, it’s because of trigonometric parallax
What if we find a watery or glassy planet which reflects lights that is maybe a 1000 years away, then by looking at our reflection in it we could see how Earth looked 2000 years ago 😱😱
Edit-Sorry light years😋
That would be too far off for earth's light to get reflected ...mind blowing concept ... But not gonna happen... Because the earth is too small... All you could see in that light is a tiny grain of sand which would be our earth ..at maximum
A great thought but quiTe impractical
Wavelength of light increase as they travel.. So. Maybe u r getting me
Light reflected by the Earth million years ago is travelling somewhere in the universe....
Then it'll take twice the distance. Earth might not be even there.. Or either scientist who have started this experiment may have died by that time.. Not just scientist but even humanity..
"How do we measure distances in space?"
In parsecs, of course!
Unless you're Han Solo in which case a parsec is a unit of time ;)
+Scarletpooky I don't get it. Who is Han Solo, and what does that have to do with parsecs?
han solo is in star wars
EastStandManc it is light second
in gallons.
Is just mind blowing to imagine ONE YEAR OF TRAVELLING AT LIGHT SPEED like heck... What's the point... Everything is so far away!!!
How to look into past in realtime:
If we find a light reflective area in space one light years away from us then this mirror area will always show one year before our current time.
This thought only came to me after watching this video, so thanks for the knowledge and keep up the ggod work.
What if we are all subatomic in size, Earth is a germ cell we live on, and that we are a part of another being?
And what if THAT being is also subatomic to yet ANOTHER being that is subatomic, and so on and so on????
+whyguitarguy1 mindfucked! :-O
+whyguitarguy1 What if somehow it loops back around and it turns out that the universe that we're in's universe's universe's universe's..... universe, is actually the universe within the universe within the universe that is within the strings that vibrate our subatomic particles? Somehow vastness goes both outward and inward at the same time.
na brein is on faiar
Ohmygod! Finally someone said that! I always had this thought but was too embarrassed to say it out loud.
whyguitarguy1 mind boggling
Thanks for the video.
Could you do one about the use of red-shift as a measure of distance, please?
I've been in the same room with someone that I thought I was close to only to realize that I was actually a million light-years away from them so I guess measuring distance is all in ones perspective I suppose
You explained very smoothly and simple
To be honest guys .i didn't understand a single word bt i was feeling happy while watching this 👍😊
i still didnt understand how we know the intrinsic brightness of certain stars and supernovae... could someone explain?
i dont get it to xD ok i understand that if you know how bright 100lumen torch is and walking away from it, you lose the light and then you can say its 40meters or 100meters. because you tested it. but how do you know how bright is the star or supernova or other object to determine how much light you lose being so far...
th-cam.com/video/HdPzOWlLrbE/w-d-xo.html
th-cam.com/video/CWMh61yutjU/w-d-xo.html
Love this channel
+WhosFaulty you love people that sound like that know what they talking bout to feed you lies....
I love science fiction, its so creative 🤣
Assuming you understand humor, like you assume science...
The last part of the video was mind blowing. Very amazing to think of it
Thank you for the clear explanation of a complex topic
It barely says that “the farther you discover, the complex it gets ”
I read the thumbnail as “How do we social distance in space.”
I swear I had to watch this like 3 times to really understand but again am high it was so worth it
man ted-ed is the BOMB
These videos put my head in a spin.
Mind blowing!!!!
I don't get the further we look back the younger the universe we see. How can we look back? Even if you can see something say 12billion light years away, what you see is the image that took 12 billion years to reach your eyes and therefore, you are still looking at the past, not a younger universe! I'm confused, please explain how do we look back in time?
well if we can see a star 12 bilion light years away , what we see today is the light the star fluxed 12 bilion years in the past . So the light thats reaches us is a picture of the aspect of the star milions of years before when the universe was young and warm ( if we believe the universe has 13.8 bilion years ) . That is the part i'm not sure . How can we get information about the beggining of the universe by just watching the light of that star?
the light from such distant stars take 12 billion years to get to Earth, so that star we see is what it was like 12 billion years ago. It was when the universe was young, and the light was fluxed when the universe was very young.
Imagine a very big medieval kingdom with the capital city is right in the middle of it. The King resides in the capital city want to know what happen in his entire kingdom and send hundreds of the fastest horse-rider to every town. Some of the town are so far away that it takes years to reach the town and return to the capital city.
One of the messenger sent reported about earthquake happen in one of the town and request help for food from capital. But the town are very far away, using the fastest horse it will take a year to reach.
So the King sent away an expedition to help the town, but by the time they reach the town, they find no one there and the town became ghost town. They investigate and find out the survivors have make a new village not far from the devastated town. The village then request for an officer from the King to govern the village. The expedition team return to capital city and report it to the King. Then the King elected an officer and sent him to the village. And by the time the officer reach the village, the village have already became so big and developed into a new town.
This demonstrate how the King can only hear what happen to the survivors through his horse-riding messenger a year later, resulting a delay of the news. Using this allegory, horse rider == light, all the light on the night sky are news we received from different time.
but how looking at the stars light years ago shows how our galaxy was then???
like he explained,the sun we see right now is the picture of a sun 8 minutes before bcoz sunlight travel 8 minutes to reach earth.. now,imagine with the farther distance..
So Some lights are still traveling for us to see.. But when it reach us its already part of the past...
I wonder how many lifetimes it would take to walk to the nearest galaxy ( assuming each life is exactly 100 years, that they walk at the exact same rate and also that you could walk through space)
I did the math out of curiosity rounding off some numbers:
Distance to Andromeda, 2.5 million light years = 15 trillion miles
Average walking speed, 3 miles per hour = 27,000 miles in a year
Walking Distance to Andromeda at 3mph = 555,555,500 years
Lifetimes to Andromeda, 5,555,555
Thats simple math actually. Try for yourself! It's fun to achive own puzzles somtimes. And if you won't succeed or want to know if its right just post it on certain forums! ;)
Oh... someone did it already for you. Fair enough.
HigherPlanes idk? That seems kind of low
Tarang Srivastava
I'm far from being a math wiz, so I could be wrong. Double check the math and let me know!
HigherPlanes I'll test in metric!
D = 2,538,000ly * (9.4605284E12km/1ly) = 24010821079200000000km
At v=5km/h,
time=24010821079200000000km*(1h/5km)=4802164215840000000hours
time converted into years=
4802164215840000000hours*(1year/8765.81hours)=
547828918929340.2435142901796868 years (woah)
If the human lasts 100 years, then it will take
547828918929340.2435142901796868years*(1human/100year)=
*5,478,289,189,293 humans* You may have been a factor off in your conversion somewhere, or I messed up! Kind of pesky to do calculations in a comment box ;)
Animation is mind-blowing .
the fact the time and space are not different, perhaps even metaphysically made of the same essence, amazes me
So any object that has a distance farther than this world’s age....we can’t see‼️
of course we can.We have currently seen distances of upto 13.3 billion light years away. Our planet is 4.6 billion years old according to scientists. But your question is wrong: Age (Time) has nothing to do with distance.
@@theshaunsta I think he means the observable universe which is 93 billion light years
@@Jelly_N oh yeah true that mightve been it
Fun fact:- the nearest universe's light would still wouldnt have reached us till now.
plot, we see our species million lightyears away. They all died and travelled to earth.
+Niller Symphony . Well, I do guess you got a point that I am bad in language xD . What I meant saying that they left the planet to earth and left everyone else die. And they travelled faster than light, therefore we can possibly see them still alive when they are dead now xD
+Niller Symphony . Well, I do guess you got a point that I am bad in language xD . What I meant saying that they left the planet to earth and left everyone else die. And they travelled faster than light, therefore we can possibly see them still alive when they are dead now xD
I drooped my jaw when you said the light we are receiving from from the big dipper is a picture of it 80yrs ago
I love how Humanity started with curiousity and ended up being hungry and hungrier for more information of life outside Earth
So if a person is standing right in front of me then technically im seeing his past woooh
That's just a less then nano second past
@@srinivas.v7902 still true past
When You listen to an Opera singer from a distance of more than 300 meter .then you can hear the Voice from the onesecond past. The
motions of the singers mouth
are not synchronized with the music. Same .Ex perience you can make with the light.
when a Person in a distance moves The lightmessage is coming from the past.
So how did they find the luminoustiy of the standard candles?
Factoid exactly
Factoid I was bout to ask same
Assumption.
I hope human will invent a spaceship that travels light years away
Not possible , it will violate relativity
@@robbenvanpersie1562 possible but unlikely. You can't decide if it's Not possible.
@@vampirethespiderbatgod9740 I can't but laws surely can, atleast on earth.
@@robbenvanpersie1562 what law? tell me about your so called law. There is a possibility that we might hit the extinction in thousand years or we might survive and progress extremely ahead.
Tell me , before a thousand years , what was our technology compared to now? Nothing. Here , a law for you. The Law of Evolution.
@@vampirethespiderbatgod9740 hope we go far👍
I really do not know how to calculate the distance in space before, but now I can understand how we can calculate it thanks TED
incredible
That was awesome nowadays mileages and timesheet for lessons. Thanks.