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What are the Lagrange points?



Uploaded by: TheBadAstronomer
Video Description:
From my weekly live video chat, I answered a question about the points of gravitational balance called the Lagrange Points.
More info on the science: http://www.physics.montana.edu/faculty/cornish/lagrange.html
More info on WMAP: http://wmap.gsfc.nasa.gov
More info on JWST: http://jwst.nasa.gov
More info on the L5 Society: http://en.wikipedia.org/wiki/L5_Society
Images courtesy those above sites.


Tags for this video: astronomy bad gravity jwst l5 lagrange phil plait points society solar system wmap

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Comments for this video on YouTube
How did you get so ... ( 3 months ago by Richardgwm)
How did you get so smart?
It's just natural ... ( 3 months ago by IRONMANAustralia)
It's just natural really. I can't help it.
... oh wait ... were you replying to me?
good to see that ... ( 3 months ago by sir455fugg)
good to see that there are people out there who can teach science without a mind-numbingly voice :)
yea he kicked my ... ( 3 months ago by stjoh002)
yea he kicked my ass with his knowledge, over and over again
'And yes it's a ... ( 3 months ago by 373724)
'And yes it's a force, get over it' Haha i love that!
Phil is Awesome. ... ( 3 months ago by Fjarhultian)
Phil is Awesome. With a capital "A".
He should have his ... ( 3 months ago by kablamo9999)
He should have his own educational TV show on astronomy.
Great explanations, ... ( 3 months ago by vecter)
Great explanations, thanks!
While I understand ... ( 3 months ago by MrCalhoun)
While I understand the concept of Lagrage points I still have problems with L3 and L2. But if I understand right those two lagrange points can only exist in a dynamic system, right?
pause in 0:29 hehe ( 3 months ago by gul11and)
pause in 0:29 hehe
DUDE I LOVE YOUR ... ( 2 months ago by erikdude666)
DUDE I LOVE YOUR SHIRT!!!
Space stations on ... ( 2 months ago by gyrogeerloose)
Space stations on the L4 and L5 points? I guess the people who lived there would have to sing "Home on Lagrange..."
Sorry, but someone had to say it.
"Theres the ... ( 2 months ago by fuocochan)
"Theres the Centrifugal force to the outside, and yes, centrifugal, it is a real force, get over it!" rofl
Unless by "real ... ( 2 months ago by JKnKosto)
Unless by "real force" you mean "fictitious force", Wikipedia disagrees with you, Phil. Sorry, I just can't get over it :(
Loved the video, though, very informative.
Wikipedia, pffft. ... ( 2 months ago by inversionjaybomb)
Wikipedia, pffft. wikipedia is maintained by its users (anyone with an account that is), and users are occasionally wrong too.
my question to you is, if centrifugal force doesn't exist, how do you explain centrifugal pumps?
Centrifugal pumps? ... ( 2 months ago by JKnKosto)
Centrifugal pumps? Err... inertia? Look, I'm not saying that the centrifugal effect doesn't exist, I'm just saying that the centrifugal force is a fictitious one, ie. it doesn't originate from physical interaction between objects. I cited wikipedia as a source since it's easy for anyone to check, I don't expect people to go out and buy a physics book just to make sure I'm not making it up.
"Wheres my squishy ... ( 2 months ago by SimonRoberts0204)
"Wheres my squishy earth ball", hehe, were taking leaps and bounds towards smashing the stereotype of the mad physicist here :P . Great video!
Thanks for making ... ( 2 months ago by usefkl05)
Thanks for making this video, it's very interesting. But I'm confused, wouldn't the gravity from the moon disturb the L4 and L5 points?
If it's a 'real' ... ( 2 months ago by furby100)
If it's a 'real' force how come its magnitude depends on the mass and it disappears in an inertial frame?
The "centrifugal ... ( 2 months ago by furby100)
The "centrifugal force" is just the liquid being pumped trying to go in a straight line because of its inertia. Essentially it comes down to how you define things. I think understanding the fictional nature of centrifugal force is an important step in realizing that any change in velocity, including a change in direction that doesn't change the speed, is an acceleration.
yes centrifugale , ... ( 2 months ago by system0system)
yes centrifugale , its a real force , get over it!!
LOL
you were on apod on ... ( 1 month ago by gul11and)
you were on apod on sunday
and you havnt aswerd my question
1. what does centripedal mean?
2. what's opposite of the word and can you tell me what it means, (q1)?
3. why does clouds stop that orbit aroung the earth again?
4. when the suns blazed collide thats when flare happen then in a few hours time does it forme to a promince
5. when supernova happens the universe expands because it's hot, well if it was cold would the universe shrink.
6. what is the dark matter
my wonderful ... ( 1 month ago by crazyhippy94)
my wonderful australian candy minty of science lol roflmao
What Phil is ... ( 5 days ago by Cockwallet)
What Phil is talking about is the reactive centrifugal force, a REAL force which opposes centripetal force.
Remember, he's talking about astronomy, not mechanics. Centrifugal Force is a slightly different thing in both of them.



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