Scale of the galaxy | Scale of the universe | Cosmology & Astronomy | Khan Academy
About | Information | History | Online | Facts | Discovery
Scale of the Galaxy. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth-galaxy-tutorial/v/intergalactic-scale?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth-galaxy-tutorial/v/scale-of-distance-to-closest-stars?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
-
I'm James Harris. This has got me thinking and in the future if there is a more accurate ancestry site with actual facts of ancestors and they have tweets and posts of your ancestors. Then I want to greet my great great great grandchildren. Thank you for looking me up. I was born in 2000!!!! Isn't that a cool year!!! I'm a 15 year old kid doing my homework and I will be decomposed and turned into dirt and (I don't know too much about chemical bonding) but maybe even in the air you breath. Make sure to tell me if you made it to Mars. How's Earth? Global warming happen yet? Have fun learning about the creation of the Internet, cell phones and stuff. Good luck to you if you take Advanced World History cause that's a lot of stuff from like 1900 to 2100.
-
I doubt we'll ever leave this galaxy. I think mankind won't last more than a million years, probably not more than 20.000 let alone one million. Everyone is fucking, they all make babies, less and less natural resources, religion is still important which is terrible for mankind, still fighting with each other. I wish everything would end soon, i'm not even suicidal just tired of religion and patriotism. And sport. Yes sport is overrated, if more people wanted to be like scientist instead of chasing money and bitches maybe something would happen.
-
Insignificant?That's understating how small we are in comparison to the galaxy.
-
Amazing!!!!!!!!
-
BILLIOOOON
-
to calculate the number of stars, we need to to know the dimater of the spiral , the lengh, and the deep high and botton. from there, we can calculate.
-
this guy gave one of the best explanations so far i heard off. my question is on those 1000 light years part, how many stars are there?? how do we calculate, multily 1000 *1000 * 1000 to get the volume , than divide by 5/4???
-
then if that's true, and it's not, then allah or god or w/e wouldn't really be too concerned with us primates on this planet in the middle of this huge ass universe filled with other life forms. you religious cultists think that the "creater" who is as you say, outside of creation and all things and time (whoa) would really be setting down books (manmade) and dogma (manmade) and directing people to hate and wars and all the other things religions do....just.shut.up.
-
I think you called the 'galaxy' 'univrrse' by mistake in your football field and grain of sand example
-
...quoting Kaidan Alenko...."Big place"
-
That's a lot of space for a single planet with life on it. Hmm...
-
Great video Sal, there is something positively fantastic about learning maths and physics from a Samuel L. Jackson voice double!! Just to clarify one point at 11:10, if the Solar System, including the Oort Cloud, were 1mm in diameter, the Milky Way Galaxy, not the Universe, would be the comparative size of a football field. If the same analogy were used and the Milky Way Galaxy was a football field, then the known observable universe would be 10 times the diameter of earth!!!
-
I agree with everything but your last point. Even standing on a 5 ft building, and seeing a 3 ft building and 4 ft building, you can tell 4 ft is medium because 3 ft is smaller than 4ft, automatically meaning 4 ft is not the largest, but not the smallest (a.k.a Medium)
-
We are arguing the same point here. The original comment said that the universe wasn't big - we are small. I'm saying that it depends what side you're looking at it from. If you're looking from the 5 ft building - then the 3 ft building is small. If you're standing on the 3 ft building then it's the 5 ft building that's big. Same thing with the universe/earth. The only people who could assume that the 4 ft building is medium are standing on the 4 ft building - have a standard for big and small.
-
I don't get what you mean... "big" and "small" alone are not measurements, you're right... But that's my point. Without one, the other is just a perception as you put it. But if you have two examples, one big and one small, or medium, or whatever you wish that is different from the other object size-wise, than it creates a complete measurement tool. If I said a 5 foot building is big, and a 3 foot building is small, you can automatically assume a 4 foot building is medium.
-
Patronising much? I fully understand the term "relative" - but thanks for clearing it up for me. That is what I meant though - that "big" and "small" weren't measurements of size but rather indications of our perception in (here, see my use of the word?) relation to them. Hahaha, very possible. I have a tendency to do that :)
-
I don't think you understand the term "relative"... Relative: Considered in relation or in proportion to something else For something to be "big" you have to compare it to something "small", or else "big" can be ANYTHING, and vice versa for things that are small. It really is as simple as that... I think you were over thinking it a bit too much.
-
Is size relative? It is a measurable, observable, mathematically provable truth. Is it not more that we relate to size from a particular perspective and thus it is our understanding of size that is relative? In which case, both SGRblink's and my comment would be equally applicable because we are approaching the understanding from competing perspectives - neither one of which is measurable, observable or mathematically provable.
-
Size is relative. If we were the size of a group of super clusters, it'd seem less big than how it appears to us now.
-
No. It's that the Universe is mind bogglingly, largely, enormously, gigantically, brain twistingly big.
12m 55sLenght
646Rating