Love this. One of the best things (among many) of this video series is that you constantly point out the wonders we can see with naked eye, binoculars or amateur telescopes from our homes. If people knew that, I’m sure the number of visits would skyrocket. Too bad they’re losing such beautiful and amazing videos.
Thanks! Jason Kendall • 1 second ago you can see the entire stack of videos here: www.jasonkendall.com/WPU/AstronomyLectures/fullcourse.shtml. This will take you in the correct order.
If two bodies having _total mass_ M (that is, M=M₁+M₂) are initially at rest and separated by a distance d, the time to fall until the separation is r, such that r
@@JasonKendallAstronomer I was just showing a way to calculate the amount of time for the collapse of an interstellar cloud to a protostar. I did that before I saw your estimates of that amount of time in your table 'The Formation of Stars Like the Sun' at 7:37. So, no, I wasn't suggesting a correction. Rather, I was contributing a way to estimate the collapse time.
@@JasonKendallAstronomer The nice thing about this formula is that you can use it (twice) to find the time interval between any two separations after the beginning of the fall. t₁−t₀ = √[d/(2GM)] { √(r₁d−r₁²) + d arctan √(d/r₁−1) } t₂−t₀ = √[d/(2GM)] { √(r₂d−r₂²) + d arctan √(d/r₂−1) } t₂−t₁ = (t₂−t₀)−(t₁−t₀) If r₁=d/2 and r₂=d/3, then t₂−t₁ = {√(2)/3+arctan[√(2)]−1/2−π/4} √{d³/(2GM)} t₂−t₁ = 0.141322975518 √{d³/(2GM)}
Thanks for the clarity and contribution! It has always amazed me that we can actually describe some very mystifying behavior with simple formulas that summarize huge ideas.
You know what's fascinating to me about protostars, is you have the same kind of formation as a black hole... with jets and an accretion disc. I seriously wonder if jupiter had jets when it formed. And I know there are different forces that work between the two, but a hurricane seriously looks like a Galaxy to me
thanks for the lectures ,my question is that , is all protostars show bipolar outflow by jets ,althought protostars have different masses and what is the remaining mass of the protostar and how long can we watch this jets event from protostar .
Fantastic intro course to astronomy and astrophysics. Thank you Jason.
My pleasure!
Love this. One of the best things (among many) of this video series is that you constantly point out the wonders we can see with naked eye, binoculars or amateur telescopes from our homes. If people knew that, I’m sure the number of visits would skyrocket. Too bad they’re losing such beautiful and amazing videos.
Thanks for all these lectures. I love listening to them. There's several I've listened to several times over.
Thanks!
Jason Kendall
• 1 second ago
you can see the entire stack of videos here: www.jasonkendall.com/WPU/AstronomyLectures/fullcourse.shtml.
This will take you in the correct order.
One word for all lectures: incredible.
these are so cool I learn so much from you
Good videos. Subscribed. Thanks
Another great video Jason!
Thank you very much!
If two bodies having _total mass_ M (that is, M=M₁+M₂) are initially at rest and separated by a distance d, the time to fall until the separation is r, such that r
Thanks for the clarification. Did I have a mistake that you’re rectifying? If so, please let me know the timestamp in the video where I blew it...,
@@JasonKendallAstronomer I was just showing a way to calculate the amount of time for the collapse of an interstellar cloud to a protostar. I did that before I saw your estimates of that amount of time in your table 'The Formation of Stars Like the Sun' at 7:37. So, no, I wasn't suggesting a correction. Rather, I was contributing a way to estimate the collapse time.
@@JasonKendallAstronomer The nice thing about this formula is that you can use it (twice) to find the time interval between any two separations after the beginning of the fall.
t₁−t₀ = √[d/(2GM)] { √(r₁d−r₁²) + d arctan √(d/r₁−1) }
t₂−t₀ = √[d/(2GM)] { √(r₂d−r₂²) + d arctan √(d/r₂−1) }
t₂−t₁ = (t₂−t₀)−(t₁−t₀)
If r₁=d/2 and r₂=d/3, then
t₂−t₁ = {√(2)/3+arctan[√(2)]−1/2−π/4} √{d³/(2GM)}
t₂−t₁ = 0.141322975518 √{d³/(2GM)}
Thanks for the clarity and contribution! It has always amazed me that we can actually describe some very mystifying behavior with simple formulas that summarize huge ideas.
You know what's fascinating to me about protostars, is you have the same kind of formation as a black hole... with jets and an accretion disc. I seriously wonder if jupiter had jets when it formed. And I know there are different forces that work between the two, but a hurricane seriously looks like a Galaxy to me
I wonder if stars begin with gas collecting onto a large rocky seed body e.g. a super earth.
Love this! Great channel. Thanks. Do you have any lectures on Rigel?
I’ll check my schedule and see if I can fit in a side trip. I hear there’s a great shawarma place there, where people can talk afterwards.
thanks for the lectures ,my question is that , is all protostars show bipolar outflow by jets ,althought protostars have different masses and what is the remaining mass of the protostar and how long can we watch this jets event from protostar .