Michio Kaku explains how Doppler effect prove the expansion of the universe #astrophysics

Physicist Michio Kaku talks about Doppler effect and how it helps in determining that the universe is expanding.

Video Credit: C-SPAN

[mattyblake]

I love science. These things always give me euphoria

[ainnovation]

This simple explanation gives me an interest to explore science again

[friedec]

"Ngiiii yenggg"
- Michio Kaku

[studypurposeonly]

Don't mind me just dropping a comment so that YT recommends more like this

[arpitraj]

Wow i was hesitating to start the chapter sound waves but now i am interested

[manjay]

The universe is expanding at an exponential rate. This has only been known since 1996 or so.

[StopLooking_Here]

We learn all these concepts while preparing for IIT JEE exams. I feel so proud of myself rn

[lordmenace]

I love this❤
Thank you for your return in knowledge my friend.🙏
This fills my heart with such joy❤😊
This is what it's all about people... Learning 😂❤

[hatemorina]

Ju falemderit shum tek une jei i Respektuar shum

[archanaiyer]

Thnx a lot 🎉🎉🎉🎉❤😊for the great knowledge about it in this video

[chrisd.]

Legit question here: how can we distinguish between a star that emits red light and a star that emits yellow light and is just too far away?

[bondedcastaway]

Since light is effected by gravity why have we not considered that the light has been stretched by passing through different gravitational fields.

[pirpirpir-osms]

all sounds great but how is the baseline color established?

[kainektenu]

its really interesting how the universe continues to expand yet i am worried that someday in the far future those galaxies are harder to glance their beauty from great distance

[smartyahmed]

He changed my perception of looking into the sky

[fromlostdays]

I get the Doppler effect, but how do we know what the wavelength of the original light was? If a galaxy moving away from us looks red, how can we tell its not just a reddish galaxy? Forgive my ignorance.

[sordidknifeparty]

Okay, except that red and blue shift is different depending on where you look, so while it may be trivial to calculate how fast a particular object is moving away from you, it's perhaps not as trivial to determine what the entire universe is doing

[ralfsenger]

Does this expansion also affect us, locally? I mean, if all the universe is expanding, then all objects inside it should also be increasing in size somehow, right? Or does it only apply to empty spaces?
But then, even the space between atoms can be considered empty and would also imply some increase in size. Then again, we probably don't have the means to "measure" this because all our instruments are also affected, or not?

[SergioCastillo]

Ways how the YouTube algorithm understands your preferences and will recommend more of something:
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Do some of that and YouTube will keep on recommending more of the similar stuff to you.

[bluetrilobite]

So how do you know that the red you see is due to stars moving away and not the colour of the light that the stars are emitting?