The Sky in 350 Billion Years

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How did Hubble discover the expansion of the universe?
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Creator/Host: Dianna Cowern
Editor: Levi Butner
Expanding Universe Animation: Keegan Larwin
Special thank you to our X-Ray tier patrons: Carlos Patricio, David Cichowski, Eddie Sabbah, Fabrice Eap, Gil Chesterton, Isabel Herstek, Margaux Lopez, Matt Kaminski, Michael Schneider, Patrick Olson, Vikram Bhat, Vincent Argiro, wc993219
Music provided by APM
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Stock footage provided by pixabay.com
Stock footage provided by shutterstock.com
If you liked this video check out these:
A picture of the beginning of the universe
→ www.youtube.com/watch?v=rut6f...
Why is the Universe Flat? ft. Prof Alan Guth
→ www.youtube.com/watch?v=MTUsO...
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Sources:
history.aip.org/exhibits/cosm...
www.smithsonianmag.com/histor...
books.google.com/books?id=vE9...
www.space.com/34708-henrietta...
www.mtwilson.edu/building-the...

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27 май 2024

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Комментарии : 2,2 тыс.

@physicsgirl 2 года назад

Our sky won't look exactly like this in 350 billion years, because we won't have a sky. The sun will have swallowed Earth 342.5 Billion years prior in a spectacular all-you-can-eat planetary buffet.

@beaumullins38 2 года назад

Question, if lets say another planet is moving away from us faster than the speed of light, and the speed of light and time are similar, would they seem to be going backwards in time to us if we could observe them somehow?

@lt_johnmcclane 2 года назад

Yummy

@deodatsingh4621 2 года назад

I understand Galaxys are getting harder to see, but stars in our own galaxy are disappearing too? That mean our galaxy is getting bigger 🙄

@utubeableact 2 года назад

Why swallow?? Space is expanding. But the objects embedded in space, like planets, stars, and galaxies stay exactly the same size. Sun is also a star then why would it swallow all planets??

@anandmistry4850 2 года назад

Does this mean that the cosmic microwave background could just be the remnant of light from galaxies beyond our observable universe and this light has been redshifted so much that we can only observe it in the microwave / radio spectrum instead ?

@YummyPork 2 года назад

Loved the analogies you used to describe this mind bending stuff. "Stickers on a slinky" and "Humans are like rhinestones on stretchy pants" are going to stick with me as much as "We are made of star stuff"

@xLatinAssazzin 2 года назад

Spiderman no way home the video game ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9VzAE-Dil_w.html

@_ninthRing_ 2 года назад

The "We are made of Starstuff." was one of those amazing statements made by the late, truly great, *Dr Carl Sagan* back in the wonderful *_1980s_*_ Documentary_ *Cosmos.* I highly recommend watching both the *1980s* original (preferrably remastered) & the *2014* remake/sequel with *Neil deGrasse Tyson.* Both have amazing science facts, history & philosophy, and are simply wonderful to watch - especially with curious kids (like I was when the original came out, all those decades ago).

@parksnewbornportraiture4989 2 года назад

Rhinestones on stretchy pants. I love it!

@guillaume5313 2 года назад

@@xLatinAssazzin yes

@JROD082384 2 года назад

But her video is wrong and misleading.

@herblison3374 2 года назад

Physics Girl is a wonderful inspiration to young people everywhere to study science. As an MIT alum I interview high school students applying to MIT. Many of them mention Physics Girl as a favorite way to learn about cutting edge science. People like Diana are essential for the health of our world.

@kosys5338 2 года назад

Diana is the perfect educator, she makes learning about the universe and the physics that rule it interesting and fun. It is always a pleasure to learn what she has to teach even though her teachings most often raise even more questions. Keep up the great work Physics girl.

@thetruffleist1297 2 года назад

Her and Scott man

@godsbeautifulflatearth 2 года назад

The Earth is Flat.

@noobkingd706 2 года назад

This video explains why i rarely see stars in my place, i only see 1-13 stars also + the sun lol

@davidvernon3119 Год назад

“Humans are like rhinestones on stretchy pants” absolutely the girliest explanation of the expanding universe I have ever heard! (and I love it)

@sorroplayz 2 года назад

Thank you for this episode physics girl, growing up I loved everything about cosmology, but life took over and my passion fadded, over a year ago I came across your channel and you ignited my interest, thank you so much, The mental wellness that you spread to others is so important and understood by more than you can believe, we understand and thank you for helping everyone learn that bit more about life.

@Willbolt_ 2 года назад

@ericparrish1515 Год назад

I'm offwhite

@liamclarke64 2 года назад

My mind really starts to "blow up" when I consider the fact that we can't be at the center of the entire Universe - so what "shape" is it, and where are we in it? I understand that we must be at the center of the "observable" universe because we are the observers, so that is not what I am saying. I love this channel; it makes me try to think about the unthinkable :-)

@k1ng401 2 года назад

Haha I had just started asking “why are we in the centre of the observable universe? Bit of a coincidence…” and then I realised “duh” 😂

@suncat530 2 года назад

@@k1ng401 it's like asking "why are my eyes behind my field of vision" lol

@liamclarke64 2 года назад

@@k1ng401 That is exactly why I love these videos, because it made you think about that, and now you understand. I love it when my brain does that - a light bulb moment!!!

@_mortiam 2 года назад

For the universe to have a center or a shape at all, it would have to have a boundary. Which it doesn't as of current knowledge.

@gabor6259 2 года назад

@@_mortiam It doesn't have to have a center or a boundary if it's the 3D surface of a 4D sphere.

@DNTMEE 2 года назад

To me, one of the most mind-bending things about light is that, as it travels through space, time does not exist for it. If it was somehow "aware" a photon of light would think it left the source which created it only an instant ago. Even if it has been traveling for billions of years. The instant it hit something and stopped, it would think it just left the source a moment ago. It would be very confused since it saw nothing in it's way just before it started on it's journey. From it's perspective something jumped out in front of it just as it left. I believe that is also the reason it can keep going and going. If no time passes for it, no energy is given up. Also, no matter how long it travels it will never get lonely.

@TD_JR 2 года назад

First time visiting your channel - and I appreciate the effort spent in giving props to some relatively unknown names in the history of cosmology. I have a bit of an interest in history itself and often times, those who've contributed even the smallest achievements in history are overlooked by those who've expanded on their discoveries to finalize achievements we attribute to those who've crossed their t's and dotted their i's with the work of those that have come before them. Here's to you Henrietta Leavitt... you did good.

@ericparrish1515 Год назад

That you Aurtouro?

@-First-Last Год назад

@ T D Did you read the title ?

@TD_JR Год назад

@@-First-Last Did you watch the video? I was commenting on some of the names mentioned in this video that people haven't heard of before and yet, have contributed much to astronomy and cosmology over the years.

@nowammies9986 2 года назад

I remember going to the Lick observatory in Mount Hamilton just outside of San Jose, with my university. I got to look through the main telescope and see a star that was light years away with my own eyes. It was such an eye opening experience, and I am so glad that places like this exist and that you get to share them here with us on the internet!!

@colorgray3251 2 года назад

You're so lucky!

@colorgray3251 2 года назад

Also thanks Dianna, you're awesome

@Graeme_Lastname 2 года назад

They're all light years away. ;)

@dannyarcher6370 2 года назад

Ummm. All stars are light years away...

@Graeme_Lastname 2 года назад

@@dannyarcher6370 You noticed?

@spoorky7718 2 года назад

Please keep doing space stuff! These are incredibly fascinating and entertaining!

@d.castillo9495 2 года назад

I'm still in awe of when I heard that the fastest human made object in space would take thousands of years just to reach the next star system in our own galaxy. When you talk about billions of years at the speed of light, forget about it.

@vb2388 2 года назад

JWST itself is taking a month’s time to reach around 1 million km.. The nearest star apart from Sun is 36 quadrillion km away from us.. So yes, definitely will take time…if my calculations are right…it would take JWST 90 million years to reach Proxima Centauri

@godsbeautifulflatearth 2 года назад

Who told you that..?

@VORASTRA 2 года назад

@@vb2388 your calculations ignore the fact that JWST sent the way it always slows down to the point where in L2 it has about 0 m/s speed

@vb2388 2 года назад

@@VORASTRA I took it as an average..rather what speeds JWST was travelling in every single point.. JWST definitely starts fast and slows down in the end as it reaches its destination..

@Yora21 2 года назад

The speed of light seems incredible fast here on Earth. But on galactic scales, it's incredibly slow.

@herculydia 2 года назад

Your hair looks Amazing. So healthy! Thank you for your opening comments and encouragement. I have felt so different and down and out of sorts with the huge ripple in our society and conflict reaching all our friends and family. Better now and so truly glad to see a new Physics Girl video to watch several times to grasp all the knowledge available. Thank you!!

@Thebreakdownshow1 2 года назад

Physics girl would be an excellent show title for kids. Superman, Wonder Woman and physics girls. It’s time we make science more friendly for kids. Keep up the great work you are an inspiration for me as a creator.

@KCadbyRacing 2 года назад

Agreed!!! 👍 Kids need to be shown there are other things to 'life' other than video games and social media...

@Thebreakdownshow1 2 года назад

@@KCadbyRacing growing up I had so much cool stuff I watched that got me intrigued towards science and critical thinking. I see that missing from the big organizations.

@Thebreakdownshow1 2 года назад

@@glauconeto what was your favourite show growing up?

@KCadbyRacing 2 года назад

@@Thebreakdownshow1 Kids interests (or lack of) starts in the home with the parents, that plus too much of todays daily input are all digital now. I grew up through the land-line only and b/w to color TV transition days = we were almost always outside doing/learning _real world stuff_ ...

@user-pd9ju5dk5s 2 года назад

But then Superman and Wonder Woman would be breaking physics while Physics girl wont?

@davidh.4649 2 года назад

Awesome video Dianna! As I watched this video I found myself thinking, you know, as good as Carl Sagan was, as good as Neil deGrasse Tyson was, I'd love to see Dianna do a season of Cosmos! You'd be great at it! The whole key to Cosmos is being able to explain highly technical things in layman's terms that people can relate to. You've already proven on your channel with lots of great videos that you can do that. And your geeky enthusiasm (I say that with admiration and affection 😁, I'm an engineer so I know what it is to be a geek) makes people want to listen to you. 😊

@mysterymeat586 2 года назад

Dunno. Her pretty face might be a distraction for us men.

@tokenghost4536 2 года назад

@@mysterymeat586 There were definitely less odd ways to compliment her, lol.

@mysterymeat586 2 года назад

@@tokenghost4536 Yea, couldn't help myself.

@whydidyouresign 2 года назад

Neil still IS, man!!

@DNTMEE 2 года назад

Unless you bite the heads off of chickens, you're a _Nerd,_ not a Geek. Well, okay, that's what "Geek" originally referred to. Mostly side show performers who did things like being a human chicken guillotine. Over the years it morphed into just another term for a tech freak.

@josephc6588 2 года назад

I just discovered your RU-vid channel and I’m hooked on your presentation and intelligence. I love science and you make it fun to learn. If possible can you talk about the 40” Refractor at the Yerkes Observatory and the other early telescope’s that made Cosmological or Astrophysics possible. The Hale Reflector I’m sure would be included on this special list.

@donsheffler 2 года назад

This was great. My family and I hiked all the way up Mt Wilson about a dozen years ago - what a climb! - but had no idea that this was such a distinguished famous observatory.

@trstmeimadctr 2 года назад

The Mt Wilson session director seems like one of those people that you would be fine listening to explain literally anything

@vigilantcosmicpenguin8721 2 года назад

He seems like the one person at a family reunion whose stories you'll always want to hear.

@ianndurocher7925 2 года назад

He sounds like someone who would send you get the dragonstone

@wmellor87 2 года назад

cool and relaxed in the pursuit of knowledge

@hoppeltrottel7484 2 года назад

Diablo III plot twist: Deckard Cain feigned his death and changed his name to become the Mt Wilson session director. "Hello my friend, stay a while and listen..."

@suzannestrickland1586 2 года назад

Awesome sponsor! Thank you for helping remove the stigma of talking about mental health. It is definitely an important topic. I got to see the pre-release version of this video. Wanted to say that the additional visuals and examples were excellent. The things we learn about the universe are mind blowing. It has sparked some questions. I will have to write them down so I can send them for the next live stream.

@nate.r 2 года назад

You seriously make some of the best videos on RU-vid always 10/10 and jam packed with information. Props and thank you for your work

@__eachfire__3418 2 года назад

I love your work physics girl. Thank you so much for creating all of your wonderful content.

@saltadmin7829 2 года назад

I've watched a lot of descriptions on dark energy and the expansion of the Universe, and I can honestly say this presentation gave me the best visual understanding yet

@tastyneck 2 года назад

I really enjoy these types of interviews. Thank so much!

@lbeanie692 2 года назад

10:00 I'm so glad she added that arrow.

@GlennRiccobono 2 года назад

"A Roomba exploded" sounds like a future video, Dianna... 😎👍 Happy holidays!

@FleshWizard69420 Год назад

Tsar Roomba lol

@geoffstrickler 2 года назад

It finally clicked for me the the expansion of the universe, and grasping that space itself can expand faster than c, also explains the incredible expansion of the universe during “inflation”. It doesn’t necessarily require a different set of physics, although gravity could not have operated the way we understand it today.

@randar1969 2 года назад

yeah if you take the current speed 73.3 km/sec per Mpc (Mpc=3.3 million lightyears) you can roughly calculate when the space between two object is so fast the lightspeed is slower. Like she said nothing can move trough space faster then light but space can expand with 73.3km/sec each 3.3 million lightyears. The only reason Andromeda is heading towards us is because gravity brings them closer together at an speed that is greater then the expansion speed. But it looks like the expansion is going faster over time.

@alwaysdisputin9930 2 года назад

@Robert Evans Yes, we are travelling FTL & we are not & there's no contradiction because speed's relative. When going along a motorway, a car travels at eg 100 km/h & it is also stationary. If you throw a ball into the air inside the car, it'll just go up & down like you're stationary. Because you are. In that frame of reference. & in the frame of reference of a far galaxy, we are travelling FTL.

@kakarikiIck 2 года назад

Happy Christmas Dianna

@muthukumaranl 2 года назад

Thank you for this wholesome piece...even though i knew a little bit about the subject i still found it infotaining with those historical context that you so nicely placed it in...

@jazznik2 2 года назад

I went to the Mt Wilson telescope years ago (took somewhat longer than an hour from LA). It's worthwhile for anyone interested in astronomy or cosmology. I also observed the "inversion effect" where you can see the smog of LA trapped at below around 4000 feet. The air above still remains very clear.

@BenC20B 2 года назад

You didn’t take a horse and cart did you?

@alwaysdisputin9930 2 года назад

@@BenC20B er that might've been me. What can I say? I felt like a bit of joyriding.

@vigilantcosmicpenguin8721 2 года назад

@@BenC20B They said "years ago," didn't specify how many. I assume they meant it happened in 1900.

@wmellor87 2 года назад

I felt for those poor people living their short lives under that layer of pollution

@thylacinenv 2 года назад

Is the edge of the universe smooth or does it resemble the outer edge of a sea urchin where dense galaxies with a greater concentration of energy drive and contributes to the expansion of space itself? Is this possible without dark energy? I really wish Henrietta could have known just how much we admire her stunning contribution these days, she was an astonishing woman.

@RobbieRosati 2 года назад

The edge of the observable universe is very smooth actually. We've measured the lumps of the earliest things we can see, and they're only around 0.001% of the average value. On big scales, the universe is not very lumpy at all, there are about the same amount of matter per volume everywhere. And the further you go back in time, the less lumpy it is.

@GlenBradley 2 года назад

We have no idea what the actual "edge of the universe" looks like nor do we even have any real data from which to speculate on. The edge of the OBSERVABLE universe is incredibly smooth, because it's all but the inside of the Big Bang, ie the cosmic microwave background radiation from the hot plasma soup that came immediately after the Big Bang. Once your observations get out to around 14 billion light years away, you are looking 14 billion years into the past, and therefore the Big Bang. We cannot see anything past 14 billion light years away because past that there is no universe to look at, nevertheless the ACTUAL universe may be 60 billion light years ... or 600 billion light years across. We are limited in our observations by the speed of light.

@maartenvd2653 2 года назад

I think there is no edge in a real sense: the earth is on the edge as seen from the edge as determined from the earth viewpoint.

@thylacinenv 2 года назад

@@maartenvd2653 Thankyou for putting my brain cells into panic mode, it's a mind boggling concept..

@johnkemas7344 Год назад

I wish I had instructors like you in high school and college!! Keep up the great work! Your smile and enthusiasm are infectious!! You are now my co-favorite physicist, the other being Dr. Tamatha Skov, a solar physicist and and an amateur radio operator. You two are both well educated, informed and very intelligent. I am an amateur radio operator and have spent my career as a devoted science person.

@shaileshrana7165 2 года назад

I love your work, Physics Girl. Thank you so much for doing this.

@Sela2125 2 года назад

I cannot properly describe my excitement whenever I see there's a new Physics Girl video. You have such a passion, not just for teaching, but teaching in a way that makes one happy to learn and wonder. You are, in my humble opinion, the Bill Nye for a new generation!

@u6106l 2 года назад

Excellent episode! Thanks for your efforts to bring science to the masses.

@deepam5246 2 года назад

This is your coolest video yet. I loved it and learned so much! Keep up the great work

@demonicmaleficentviciously140 2 года назад

So cool! Ive hiked chantry flats so many times, I didnt know the Hubble was up there!

@Tralin 2 года назад

Always love these videos! Caught one thing though: "I hope that sometime down the road our ancestors are blown away by what we don't know yet." I think you mean "descendants" :P

@alwaysdisputin9930 2 года назад

the spawn of our loins' spawn of their loins' spawn of their loins yeah 'descendants' is better

@Tralin 2 года назад

@@alwaysdisputin9930 Actually. I changed my mind. I'm with you.

@DrRiq 2 года назад

@@Tralin what? he agreed with you already. you didn't need to change your mind

@Tralin 2 года назад

@@DrRiq I was making a joke, bud.

@DrRiq 2 года назад

@@Tralin ...

@christopherbarber9351 2 года назад

Thank you for your work! I hope you'll continue taking care of yourself -- you and your work are very valuable to us viewers.

@zrodger2296 2 года назад

Really good video. I can tell when I have to rewind here and there to hear something explained again, and especially when I find myself leaning towards my screen. As if being a few inches closer will help me understand better! Happy Holidays to all! (And best wishes for JWST!)

@sargenmi 2 года назад

What a great video, thanks and Merry Xmas 🎅🎄💝

@DrewBritten 2 года назад

Mind blown! This episode was so fascinating and so mind bending at the same time. Thanks for seeking out the brilliant women scientists of the world who have succeeded despite all the obstructions in their path. I just ordered a copy of Dr Mack's book, and can't wait for it to arrive! Also, thank you for taking time to step away from RU-vid for your own health. Your content is always worth the wait, even the less polished early videos.

@bigsarge2085 2 года назад

Fascinating! Makes me wonder what new discoveries will alter our current understanding of the state of our universe.

@chrisandlane 2 года назад

I was wathing the lift-off of the Webb telescope live and couldnt help but think of you. Happy holidays and happy new year!

@asherplatts6253 2 года назад

I'm excited to watch this episode. The thing that keeps blowing my mind is that the distant light we can see is from when the universe was smaller, but it's bigger now, so we are seeing a 3-D image of a smaller universe that is now bigger than it looks. Which I can't quite wrap my head around without employing the weird curves of a 4-D sphere that "turns" backward on a time axis as you increase distance from a center point.

@NewMessage 2 года назад

My waistline totally feels for ya, Universe.

@ericvanvlandren8987 2 года назад

Dianna, I love your videos so much. I’m glad you take breaks for yourself. I’m sure you know (but it is always important to hear) that you have thousands and thousands of people who support you and care about you - thanks to your channel. You’re the best. Happy Solstice.

@requiemglassworks9254 2 года назад

I love how excited you get about the sombrero galaxy at 2:00, that put a smile on my face! Exploding rumba galaxy sounds better!

@mercenairy1 2 года назад

I LOVE YOU PHYSICS GIRL...YOU MAKE PHYSICS FUN!!! NEVER A DULL MOMENT... IM A HUGE FAN (200 POUNDS..LOL) THANK YOU FOR SHARING ALL THE AMAZING THINGS...AND HAPPY NEW YEAR

@johnchessant3012 2 года назад

A very strange mathematical fact: If the universe expanded at a constant rate, then it would actually be possible for light currently emitted by a distant star to reach us, though it would take a long time. (basically, the fraction of the total distance the light travels per second decreases over time, but slowly enough that the sum still diverges -- see the Wiki page on the "ant on the rubber rope" puzzle.) But this is not true if the expansion is accelerating!

@YoutubeHandlesSuckBalls 2 года назад

No. There would still be a point beyond which we were unable to see objects. Because each light year stretches the same amount, something 2 light years is moving away twice as fast because you add up each segment, which means objects further away recede faster. However slow the expansion, even if constant, there would be a point moving away faster than the speed of light and so no light from objects further than that would ever be able to reach us. The acceleration of the expansion merely exacerbates this and will lead to the 'event horizon' becoming closer over time.

@super_hero2 2 года назад

@@RU-vidHandlesSuckBalls I think you misunderstand what John said, when he says "the universe expanded at a constant rate" he meant that every year, the distance between 2 objects in space increase by the same amount. So year 1 add 1 light year, year 2 add 1 more light year, year 3 add another 1 light year and so on. Which is different from what you meant by "each light year stretches the same amount..." which is not constant amount every year because the added space also adds more space. In John scenario, light will eventually reach us, in your scenario it might not reach us.

@Let_The_James_Begin 2 года назад

I'd love to learn how time dilation figures into universe expansion and the cosmological horizon. It might turn my brain into oobleck but I still want to know.

@ronniescrazyadventures2478 2 года назад

Thanks for flipping my understanding of the universe on my head Diana! I love this work.

@MonesMuziekFabriek 2 года назад

I LOVE how Dianna gives credit to women who should have been rewarded in the past

@hasanelrabih283 2 года назад

Yes! Praise the Sombrero Galaxy! It's one of my favourite celestial bodies!

@vigilantcosmicpenguin8721 2 года назад

I'm holding out for when someone discovers the Beret Galaxy. Or the Stovepipe Hat galaxy.

@FleshWizard69420 Год назад

@@vigilantcosmicpenguin8721 tophat galaxy, helmet galaxy

@FeierLin 2 года назад

Hi Diana! Great video. I have a question that I'm not sure if you already have a video on... But what exactly is space? Does it lack atoms entirely? Or like, a measurement of the distance between two objects?

@Mental_Illboy 2 года назад

I'm scared of intelligent pretty girls.

@ikitclaw7146 2 года назад

No one knows for sure exactly what the "fabric of space" is, a boundless 3 dimensional expanding area containing all that is? Lots of interesting theories though.

@FeierLin 2 года назад

@@ikitclaw7146 it's crazy trying to wrap my head around 🤣🤣

@KentonBenfield 2 года назад

If you read up on the Wolfram Physics Project, the going hypothesis is that space is possibly the only 'thing' in reality, and everything else (even time) is just built out of this universal 'stuff'. And it's also a type of universal computer; and it's discrete, not continuous.

@Robert_Keel 2 года назад

Absolutely great presentation - thanks.

@hatchetman3662 2 года назад

Just found your channel, today. Really glad I did. Your content is great at entertaining and informing. Subbed.

@bdgrandin 2 года назад

This is a all very interesting. Weird question. Has the expansion effect where a far enough galaxy's light will no longer reach us been observed? Have we observed a galaxy’ disappearing from our view due to the expansion between us and it becoming faster than light can travel from it to us? Are there recorded examples of this occurring. I would think if the theory is true we should be able to see it. That discovery and proof would be great to share and show people.

@garykoponen7244 2 года назад

They mentioned that galaxies on the edge of the observable universe would fade out. It seems to me that when a point in spacetime coincided with expansion that they would blink out.

@Demonrifts 2 года назад

We've only really been able to look at the edge of the observable universe for a few decades now. On a cosmological timescale, that is less than an eyeblink. Factor in that there are billions of galaxies, the likelihood that we would notice one of them suddenly fade out is abysmally low. I wouldn't expect that that will ever be something we witness.

@Roberto-REME 2 года назад

Outstanding video: very informative, lots of learning, fun, interesting and excellent narration. You're the Best Dianna.

@pauls5745 2 года назад

great stuff! I always learn something when I watch this channel. Maybe we could get something focusing on conservation of energy? fascinating stuff

@nutier 2 года назад

Awesome video ! I enjoy it so much . Thank you for sharing . How many habitable planets in the universe ?

@MorganHJackson 2 года назад

Awesome video, this explained a complex concept really well. I'm also really glad to hear you take time off for yourself. Your own health is the most important thing, it's so good to hear you can take time to look after that.

@brentu777 2 года назад

Such an amazing video!! It’s hard to wrap your head around a lot these concepts or even try to contemplate them, your style makes it understandable and much less daunting for non physicists and astronomers. Thank you so much!!!!

@jorengoeteyn4797 2 года назад

I always wish these vids are longer =) Love to watch them, there so great. It set people to think, even if we don't have a physics background. My question is: Will everything fade out with the scenario if only the universe keeps expanding? So is the universe determined what ever it does to cool down eventually?

@ericparrish1515 Год назад

Somewhat but I can't really see any science stuff in reality. Just punks.

@trepplee 2 года назад

I could sit and listen to you for days n not get tired!!!! Love ur vids! Amazing stuff!

@hexisplus9104 2 года назад

My brain started trying to think about the calculus needed to work out that an object moving away from us due to the universes expansion. Combined with the concept we are rotation and spinning within the milky-way, solar systems and on the earth makes the maths kinda insane... Unless they are using tons of approximations. 🤔

@ikitclaw7146 2 года назад

your just over thinking it, while its not overly complicated it still requires a good education in maths. and you can never discount approximations when it comes to scientists lol, approximate, check, rework, narrow down the result, try again.

@YagamiKou 2 года назад

if we lack alot of data, scientists can use fermi problems they are a kind of math where u get estimates for all ur variables and the answer is weirdly accurate because errors in 1 assumption, get cancelled out by errors in other assumptions leading to generally accurate answers they arnt heavily relied on but they can give good indications and sometimes hints of what u really need to look at or in my case, I use fermi problems to estimate the cost of my shopping 🤣

@hexisplus9104 2 года назад

@@ikitclaw7146 I did theoretic chemistry and chemical physics. I was a maths and science teacher in a previous life. My maths is pretty good.

@hexisplus9104 2 года назад

@@YagamiKou you are spot on, we used these alot in our theoretical chemistry and chemical physics classes.

@Nighthawkinlight 2 года назад

Not enough science is done with pipe smoke these days.

@alwaysdisputin9930 2 года назад

David Tong says: "There are many places in the universe where solitons form, smoke rings in air..." ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ederft9dkag.html

@yetanothertop Год назад

Amazing! Thank you! You make it fun and interesting. And, then, you slip in the information in a way that makes me want to watch your next video. I would love to see you do a Great Courses series.

@RideAlongAdventures Год назад

I’ve watched this dozens of times. I keep hoping my brain will grasp even the smallest part of this. Until then, I’m left with this incredible, exciting awe. Thanks for sharing this in such an inspiring way. Also, hope your feeling better. I/we miss you!

@montanateri6889 2 года назад

I love your shows. And I love the clear joy that shines from you in imparting knowledge. In discovery. In science. You rock!

@agargamer6759 2 года назад

I watched the video already familiar with the cosmology side of things, and I was struck by the human experience that you captured here. What were these people like? What was going through their heads as they made discoveries that we still talk about?

@troyrodrigue6172 2 года назад

One's again. Awesome! You have such a way to explain everything. I must say I have read this book from Katie Mack, Outstanding book. Thank you so much. Merry Christmas to you and yours and may the new year bring us just a little bit closer to understanding everything.

@noisecrack 2 года назад

I love your channel. i love this kind of content and detail. good editing.

@CrazyTechy 2 года назад

Great astronomy stuff, and you’re fun to watch. The number of galaxies and the expanding universe is mind blowing. I’m an elect engineer with a computer background.

@marcuswelseh9000 2 года назад

Despite the economic crisis,this is still a good time to invest in stock and Crypto trade🥰

@martins2375 2 года назад

The rich spend less and invest more..

@gratisgratis7275 2 года назад

Investing in these economic crisis will be one of the best thing to do..

@ryanscribner9285 2 года назад

@@gratisgratis7275 You're right! I think stock and Crypto are the best😊

@dimitratzina6919 2 года назад

As stock's are good but crypto is better?

@davisonmichigan4039 2 года назад

I wanted to trade crypto but got confused by the fluctuation in price..

@KonwTheTrut 2 года назад

Omg I cannot wait to read her book. Always been fascinated with the after after. Thanks for the recommend.

@nickaston2468 2 года назад

Excellent video, presentation and explanation. Thank you.

@Yashuop 2 года назад

Claim your “here within an hour” ticket right here

@facts9144 2 года назад

Looool ur channels dead🤣🤣🤣

@calvinmarshall54 2 года назад

You’re awesome I love the information you share.!!! Keep it coming dear.!!! 😊

@Mike504 2 года назад

Merry Christmas (or your equivalent) and love to Dianna and all.

@turkfiles 2 года назад

I’m responding rather late considering when you made this video. With your travels to the Mount Wilson Observatory in mind, I would like to bring up the Palomar Mountain Observatory in San Diego County which is run by Caltech. (FYI, I am aware of the rivalry between MIT and Caltech:-). There is a book called “The Perfect Machine” which chronicles the building of the Palomar Observatory. However, it does cover a tremendous amount of the history about Mt. Wilson which is where the beginning of the idea of building something larger than Mount Wilson occurred. Hubble is mentioned throughout the entire book. I do recall reading about the woman photographic interpreter who’s incredible insight came across the variable stars which allowed Hubble to turn the world of cosmology upside down. I’m sorry if someone else has already commented on this. I just didn’t have the time to go through 2.1 thousand comments. Please keep making these videos because I love them! 👍🏻

@ericparrish1515 Год назад

You got a crew then. Your leaders get along? Common goals.

@marancibia1971 2 года назад

Dianna, I love your videos. Your passion for physics is contagious. Greetings from Chile.

@rayoflight62 2 года назад

Very, very well explained. I read Weinberg book "The first three minutes" when I was a student; at the time, it took me an entire week to grasp all the concepts which you and Dr. Mack explained clearly in few minutes. Thank you...

@jjgarridopro 2 года назад

Great content!. I just discovered your channel and learned more about the universe expanding. :)

@maxwell7725 2 года назад

Great show both content and technally.

@jeff6899 2 года назад

Love everyone of these ! Very en"light"ening ! 😁 Continue to take care of yourself. Your enthusiasm & honesty is refreshing & infectious :)

@hughbarton5743 2 года назад

And thanks as well, Dr. Mack! Very lucid explanation...nice job!

@alessioandreoli2145 Год назад

Absolutely fantastic video!

@cornebistouille 2 года назад

THANK YOU ! i am quite familiar with concepts of expanding universe, and dark energy, but this is the first time i really understand them, and yes it is mind blowing ! a little scary too, but amazing :)

@mouawyaa 2 года назад

Amazing video as usual, thanks so much 👍

@dimahamza8568 2 года назад

Keep going Dianna I love hr vids!

@JjVa20 2 года назад

I love how she says "Goosebumps!" with the biggest smile on her face 😊

@thomasjohnpaine8443 2 года назад

Great video. Thanks for mentioning your self care, it makes me feel less alone. Especially in a world gone insane.

@kasualbeauty309 Год назад

This kinda describes some of my dreams where I’m climbing stairs that never end the end seems near but when I go towards it it gets further away. Same with hallways or when I’m trying to reach someone important during crisis or catastrophe. It’s quite daunting

@davidgpeterson 2 года назад

You do such an amazing job with these videos.

@ericparrish1515 Год назад

Yeah she does.

@LittleBigChina 2 года назад

Great vid conveying some really mind-bending stuff in an understandable way... Love it!

@normhill6985 2 года назад

Best explanation I've heard so far.THANKYOU.

@Soulfire252 2 года назад

Great presentation on a very mind bending subject. Bravo you just got a new fan🤩😎

@v3nt1main 2 года назад

My dad once told me (when I was around 8 or 9) that it's the lights here on earth that is causing the thing of why we can't see the stars but after I watched this, I was kind of scared but like I watched 3 of your videos and I liked it and i really love your channel! It helps me learn about these kind of stuff that I never learned in my life!

@darylpeterson9115 2 года назад

This is way above my education level but I love it. Thats for sharing your knowledge. I'm hooked