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I am reading Steven Weinberg’s (The First three minutes) book and came across (Cosmological Principle), this was the first video that popped up when I searched the concept. Thanks for the explanation

This seems to come on when people try to sleep Great video kept me up till 6 am Nothing i didnt already know in general but great listen still

He is the person who inspires me to learn more n more!!

I watched a Kip Thorne vid.. he was talking to 18 year old freshman college students.. The dude tossed out a random fact. A black hole's diameter is longer than its permiter due to the gravitational warping of space. he was like shrugs Einstien understood the definition of pi is BS because of gravitational influence. It's like Kip.. lets jump back to the whole diameter longer than circumference thing... he blew right past it

Thank you professor!

Here to sleep

You are amazing Jason ❤

~59:30 if a 40 solar mass directly collapses into a 15 solar mass black hole, where did the rest of the energy go?

The gamma ray burst picture looks eerily like the CMB picture, with the range from green to red and their placement. Just a coincidence I'm sure, but it just popped into my head when u displayed the slide. Wonderful lecture, like all of yours. I can follow these fairly easily but feel i getting a good basic astrophysics basics up to advanced overview. Thank you again, my friend, for sharing your knowledge

Maximillian! The time has come to liquidate our guests.

Thanks!

My finite mind can't comprehend an infinity

You have a cricket in that room man, he's chirping all the time 😂

Thanks!

You sound exactly like Adam Savage

@jasonkendall Thanks for many very informative videos. I have to admit though that I don’t understand the logic behind astronomical parallax. That is not just from you, but from every explanation I have ever come across. eg: you take a measurement (a) and six months later you take measurement (b) and count the distance between the two as 2 au. You then half that to presumably give a baseline of 1 au and a right angle from the sun. What about the fact that the sun and earth are also moving through space at right angles to this assumed baseline at about 220,000m/s? Wouldn’t that put the distance travelled by the earth between (a) and (b) closer to 22 au? Where am I going wrong?

Which one passes more of my money onto the creator, RUclips membership or Patreon?

@2:30 light travel distance also does not take into account light travel TIME.

I know I am coming in late here but I have been complaining in my own mind and once or twice to others since I was 15 years old that people were using the word “universe“ incorrectly. When I was 15 I asked my dad what the word “universe“ meant, and he said “all of everything,” and that has been the definition I used. I kept getting frustrated when other people were using the word universe when the truth they only meant the OBSERVABLE universe. I have never been willing to accept that the universe comprised only what we could observe. I’m glad to see that that that misunderstanding doesn’t reach the astrophysics community as a whole. And that the scientific community agrees with me that we are not seeing “everything” and disagrees with the idiot who told me there couldn’t be anything beyond what we could observe, because if there were we would be able to send it in some way. On which attitude I call shenanigans.

of course you cant get the speed from one measurement of position. if you take one snap picture of race car, you dont know its motion

If you are only using this for sleep, you're going to miss out on the most important galactic information known to mankind. This answers so much of the things I think about, and it does so in a graphic format where I can actually imagine the scales of things I never could before. Thank you for this video, Jason Kendall! Oh, and by the way, this was done in 2018. We have since taken an actual picture of the SMBH in the center of our galaxy, or at least the accretion disk that proves Einstein's theory about black holes.

This channel is such an amazing resource :)

Thank you... Now i know how novas can repeat more than once.

Its my love for this subject the brings me back to Elite Dangerous over and over again. Its like an interactive telescope of our galaxy.

MANTAP 👍🌟

Strong Force: Nyah nyah, nyah nyah nyah, I’m stronger than yooooouuu… Gravity: Yeah, you hold that thought.

23:05 I have problems with understanding Photons! is a single Quant_of_Pht really a travelling packet of ELM_vibration in a "line" or is it a 3D_Sphere, expanding at c and "gaining" direction only at Time of Detection/Absorption? But then again how to explain Lasers? (which always are a multitude od Quanta)

silly question. if they were to use quantum entanglement based comms, so immediate reception, would this not create a paradox? this would be faster than faster than light. so what's the deal? thanks

Joined. I would love to see more content aimed at undergraduate physics majors who have some math under their belt. but that's just me. I'll be looking forward to seeing more from this channel, though. thank you, Dr. Kendell. lastly, totally unrelated, but free Palestine! (from ongoing US-Israeli bombing) ❤ thank you.

Hi! Just want to say, Your videos have given me SO MUCH happiness, peace, knowledge, joy, better sleep, and more. Thank you, thank you, thank you! If I knew more people, I would share your channel with them. Just know, your passion and work is incredibly meaningful and valuable and brings so much joy to many people!!!! I am honestly shocked that you do not have more subscribers/views- but I GUARANTEE you that gold will always shine through and so will you!! Your channel is invaluable. Your students must be so lucky to have you.

Black holes were called "frozen stars" but the name never took root, get it ? Tfar=Tdeep/SR.

Magnet on a wire induction is as a torque

Sir I have to ask why the lights of lightning moves not as strait as we think but most of light moves strait.?

Why does energy wave field of light does not affected by magnetic field?

Hello. Sir.... I have question on. Light that I think I don't know where the light moves if two opposite light collides? Does it makes polarize the wave of its energy to produce smaller wavdlights?

It might be useful to keep in mind that anything in the universe less than about 500 million light years away hasn’t really changed much in the last 500 million years. Although we are seeing it as it appeared 500 million in years ago, it looks pretty much the same today. 500 million years is not all that much of a significant time period when it comes to something the size of a galaxy.

Really appreciate your work!

How many cups of coffee do i need to understand this. 😊

Any chance (like if you're bored) you could hit cosmic inflation? It's supposed to be like space inflated like a helium balloon faster than the speed of light... then it suddenly ceased, and now the universe has several horizons... like objects 11 billion years old are actually 40 billion lightyears distant, and there are horizons where objects currently emitting light that will be dimmed into blackness, but we can still observe what they had emitted billions of years ago, but won't be able to later... the horizons are all very confusing

Factual correction: It’s not just neutrons which cause activation. High energy protons (e.g. 19MeV) will activate low Z nuclei as well as spalling neutrons which activate surrounding materials.

Hey, I'm new here, and I'm only 30 seconds deep, but I know I'm going to absolutely cherish this

*_wow_* ...

21:15 ... absolutely *_amazing!_*

Since the term “luminiferous aether” is now available for recycling, I suggest that we change the definition slightly and use it instead of “dark matter.” Who’s with me?

I asked Fraser Cain Sunday night to explain why some white dwarfs in binary systems produce Nova and others produce Type 1A Supernova. Then I thought, I'll bet Jason Kendall has a comprehensive video explaining this. I was right!!!😂

2:07 Questions about "1) Redshift": 1. All celestial bodies exibiting redshift, and thus moving away (from our perspective), are bodies situated milions/billions of lightyears away. Thus the redshift we see today happened millions/billions of years ago. Thus the observation we make is no longer up-to-date by millions of years. Are we sure they are still redshifting or are they blueshifting bouncing back, but that light has not traveled back reaching us yet? 2. If our perspective is not the center of where celestial objects are redshifting from, moving away from us, is it logical to expect the same redshift movement everywhere? That would be rather a coincidence.

I love your channel. You have the best Astrophysics videos on RUclips. Thank you for your work & for sharing your knowledge with the world. 😊

I've been enjoying this playlist a lot. Is it possible to get that ppt for revision afterwards?

Jason is such a great ’splainer and has such fun with these lectures.

Oh dear😢I've nodded off again 😅