The Milky Way: Crash Course Astronomy #37
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Date: 2022-04-04
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Comments and reviews: 6
Navid
First of all thank you for your amazing videos Phil. I-m literally hocked on these! Would you be able to explain more about the wave/jam, that propagates outward through out the galaxy. How is it that this wave lasted so long (billions of years) And the stars/nebulae within the galaxy get pulled inwards within those arms. are those giant molecular clouds that initiated this jam are still collapsing, billions of years after the initial collapse, hence the inwards spiral? Or it is the cumulation of the gravitational force at the center of the galaxy that is contributing factor here? I-m very much intrigued with the idea of this wave still exists after such long period.
Thank you in advance,
Navid
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First of all thank you for your amazing videos Phil. I-m literally hocked on these! Would you be able to explain more about the wave/jam, that propagates outward through out the galaxy. How is it that this wave lasted so long (billions of years) And the stars/nebulae within the galaxy get pulled inwards within those arms. are those giant molecular clouds that initiated this jam are still collapsing, billions of years after the initial collapse, hence the inwards spiral? Or it is the cumulation of the gravitational force at the center of the galaxy that is contributing factor here? I-m very much intrigued with the idea of this wave still exists after such long period.
Thank you in advance,
Navid
reply
Perhaps
-5: 22
I was with you, until the -traffic jam- analogy.
I understand what you were trying to convey. But gravity does not work the way traffic jams work.
With gravity, all of the cars would crash into each other. None of the cars have brakes.
When the car in front slows down, the car behind it does not slow down. Rather, it speeds up, due to gravity pulling it into the car ahead of it.
The -traffic jam- analogy gives the impression that stars slow down to avoid each other, while the laws of physics is the opposite (objects with mass are attracted to each other, and stars certainly have mass -- lots of mass.
Cheers!
reply
-5: 22
I was with you, until the -traffic jam- analogy.
I understand what you were trying to convey. But gravity does not work the way traffic jams work.
With gravity, all of the cars would crash into each other. None of the cars have brakes.
When the car in front slows down, the car behind it does not slow down. Rather, it speeds up, due to gravity pulling it into the car ahead of it.
The -traffic jam- analogy gives the impression that stars slow down to avoid each other, while the laws of physics is the opposite (objects with mass are attracted to each other, and stars certainly have mass -- lots of mass.
Cheers!
reply
Thomas
I really enjoy and value your astronomy videos (all the other subjects too. I am teaching astronomy (and later biology) to a couple of home-schooled middle school kids that are, unfortunately, exposed to a young earth creationist who is teaching them pseudoscience with a sprinkling of real science. Their mother was concerned enough to ask me to teach them real science. Your videos make EXCELLENT supplemental material! Thanks!
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I really enjoy and value your astronomy videos (all the other subjects too. I am teaching astronomy (and later biology) to a couple of home-schooled middle school kids that are, unfortunately, exposed to a young earth creationist who is teaching them pseudoscience with a sprinkling of real science. Their mother was concerned enough to ask me to teach them real science. Your videos make EXCELLENT supplemental material! Thanks!
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Karissa
Now I-m curious about Uranus- view of the stars. Since it rotates on its side does it have certain views that don-t seem to have a bunch of stars because of positioning? I-m sure we don-t know at this point
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Now I-m curious about Uranus- view of the stars. Since it rotates on its side does it have certain views that don-t seem to have a bunch of stars because of positioning? I-m sure we don-t know at this point
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StormCrowYo
I dont understand the traffic jam comparison. Traffic doesn't function based on gravity, soooooo why wouldn't the stars ram each other/slingshot off one another/create crazy binary systems/etc?
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I dont understand the traffic jam comparison. Traffic doesn't function based on gravity, soooooo why wouldn't the stars ram each other/slingshot off one another/create crazy binary systems/etc?
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james
I don't get what you're saying about a traffic jam. of course as one car leaves in the front another pulls up behind. why'd you say it like it was a big secret?
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I don't get what you're saying about a traffic jam. of course as one car leaves in the front another pulls up behind. why'd you say it like it was a big secret?
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