We can see things moving faster than light
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- čas přidán 16. 05. 2024
- How is it possible for galaxies and objects in space to move away from us faster than the speed of light? Will we ever see those objects?
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I'm curious: why wasn't the Hubble Sphere called the Hubble Bubble? How much toil and trouble would it be to change the name?
I would think the answer to your question would be self evident.
Your wit is wasted here...
Very good ! 🤣
Easy. Use the correct incantation:
"Presto changeo toil and trouble
Rollo chunky double bubble"
Gary... I love you XD
I wanted to call this series "In here 🧠 Out there 🌿"
I love this series. Something for the brain, something for the eyes and something for the heart ;)
I'm still not clear why you called the path of the light a boomerang motion? I understand the concept of it appearing to stop due to the expansion of space but doesn't a boomerang return to its origin?
"In here brain Out there asparagus"? 😂
@@nadamuchu In this case it isn't that the object (in this case, a photon) is returning to its origin, just that it's sort of turning around.
It starts out moving toward us relative to its origin, but away from us relative to our frame of reference (because the space between us and the photon's emitter is expanding faster than the light is moving through it). Eventually that boundary catches up to the photon, though. When that happens, the space between the photon and Earth is no longer expanding faster than the photon is moving, so it can actually make progress toward reaching Earth. If we could view that photon in real time, we would suddenly see it go from moving very slowly away from us to briefly appearing to stop, to then moving very slowly toward us.
It's a bit like the photon is a person swimming upstream in a powerful current, but the current is getting weaker over time. Initially the stream is too strong, and the person is swept away but over time as they swim the current weakens until eventually the person can overcome the force of the water and start making progress upstream.
Will time get slower if the space is expanded? How would that affect speed of light?
Hope everything is getting better!!!!
I love everything space related and the way you put it for us not so smart folks is just great! Keep doing what you’re doing.
Ps. How can I steal your editors job?! I would LOVE to learn on the job lol
You can help support her on her Patreon page, shes sick and not doing well you know.
During the ad, she says that I probably have a 3M product in arms reach. Since I'm physically at 3M Center (I work here) this is absolutely true.
I looked at my Command Strips and grimaced.
You guys make some great stuff with quality that's hard to beat!
can i get some retroreflector tape? .)
The concept of light traveling towards us while also moving away from us as space expands reminds me of trying to walk the opposite way on an escalator...although I'm sure it's quite a bit more complicated than that analogy, if I understood anything from this video
just add some acceleration to your walking in the opposite direction since space expands less as you move closer
I used a similar analogy by swimming up a river
@@SoWAHHHT well I guess the deceleration of the escalator as you move down it, would be more accurate
You can walk the opposite way on a escalator by walking faster then the escalator
Thats the flaw with the "Universe is expanding faster then light" thing......light would never reach us from such objects as we wouldnt be stationary in an expanding universes Either (it e 64 billion light years away and a "blank" spot not decernable from empty space)
13.8 billion years would be a late 80's-early 90's Astrophysics/Cosmology/Theology text book......mostly thumped on not actually read (My professors favorite discussion was turning a sack of potatoes into a Universe,never had us open the textbook once, just told us what was in there😶)
@@FrarmerFrank So you're saying this girl is wrong ❔️❓️❔️
Thanks for the great explanation! Something which always bended my mind. I would love a follow-up, where you explain how during a Big Rip, one of the horizons gets closer until light from even say Andromeda wouldn't reach us anymore, while the observable universe still gets larger as time since the Big Bang increases. I'm still a bit confused about that, how that works.
Listening to you and watching your videos are just so captivating
Your editor sounds really smart
Lol
I guess?
Hey! Up and atom I think I learned the similar concept from one of your video. Where you talked about why sky is dark at night despite having so much stars.
Love your channel. One of the best on youtube!
Well he had no clue about the expansion of space time so….
Just imagine the wonders and poetry of deep space . No limitations. As Stephen hawking once said " There should be no boundaries to human endeavor. We are all different. However bad life may seem, there is always something you can do, and succeed at. While there's life, there is hope."
My life has been a complete and total misery ever since Bigfoot stole my precious girlfriend in the middle of the night.😒 He even took all her clothes and the T.V.
And as we all know: "Life... erm... finds a way."
Twitter will someday find this comment to be VERY offensive and you`ll be in big trouble!
you explaining top him and awnsering his questions made it way more easy to understand . great teaching technique .
I’m a huge fan of all things science and Physics Girl. She’s a great science communicator and I look forward to watching her career unfold over the coming years. Live long and prosper.
You know her current situation?
This is such a sad comment to see after what happened to her.
6:05 *"The space between two objects can expand such that it moves those objects apart faster than the speed of light."*
This is perfectly worded. It acknowledges that it _is_ a speed (distance over time) while still highlighting the difference from what we would normally consider a speed.
Kinda like two cars traveling opposite directions at 50 mph each are expanding the distance between them at a rate of 100 mph.
Hey Science Asylum..want a video of yours on this plzz
No object or mass can travel at or faster than the speed of light.
Its Impossible.
It would require all the energy in the universe. That is impossible.
@@codemang87 but, they are not going 100. They are going 50.
Perspective is not speed.
@@rdallas81 indeed. Just like these distant objects appear to be moving faster than the speed of light. They aren't; it just appears so because we are also moving too. You gotta remove our perspective to understand it; hence my car anology.
Just when you think you're beginning to understand the universe it humbles you and you've got to rethink everything. Love your videos. Thanks for sharing this knowledge.
I was wondering why is the Universe only expanding outward? Away from each other? Why can't it contract or ossilate or interact so that it orbits each other??
@@justignoreme7725 , I don't think there's anything that says that it can't, only that it isn't. They don't really know why space is expanding. So, they call the force that is causing it, dark energy. Dark because we can't see/tell what it is.
@@NickRoman so is it that we can only measure movement in one direction and that we are incapable of measuring in any other direction or is it we are capable of measuring movement in all directions but can detect movement in one axis??
@@justignoreme7725 No. It's that in whatever direction we look, the universe is expanding; same rate in all directions.
@@timjohnson979 , yes and with the distances we're talking about, I think we really can only measure in one direction. That is, we can't tell if two very distant galaxies are moving laterally with respect to each other. Look into how we know how far away things are to understand that. There are several ways, each depending on how much distance we're talking about. It's an interesting subject and methods get refined over time.
You are so good at this. Your delivery is so absorbing. Well done
Very clear and truly astonishing! thanks so much for helping us understand more.
Wait, so does that mean that, even if it were possible, we would never be able to see the “edge” of the universe because it’s moving away faster than the speed of light? Or am I misunderstanding?
Yes czcams.com/video/eMvQUDAc0zU/video.html
Faxx
Yes, that is correct. Eventually, far far in the future the amount of stuff that we can "see" will actually grow less and less over time because everything is so spread out. Talking like, long after the sun explodes kind of time scale though.
Depends what you mean by the "edge" of the universe. If you're talking about the edge of the theoretically "observable universe," well WHOOEE it gets complicated.
- We can't see that edge because the universe was opaque to light at the very beginning.
- But we can see pretty close (that's the cosmic microwave background light). With the CMB, we're seeing the universe as was about 13.7 billion years ago.
If you're asking about the edge of the WHOLE universe, we don't even know if there is an "edge." But if there were, and it were beyond the observable universe, then we'll never see it as it is now.
As the rest have said..yep. Love it.
Might not even be an edge. One possible model is the Universe is like the surface of an expanding balloon. Not the interior volume where the balloon surface is the edge, but the surface where if you went along far enough, you might circle back like going around a globe.
Mr. Editor: you didn’t give her the slide transition! Awwwww.
We had a good laugh at this. Sometimes we leave things that make us laugh hoping someone else will laugh, but knowing they'll probably just think it's awkward.
@@physicsgirl can we laugh and think it’s awkward? Awkward isn’t necessarily bad :)
@@physicsgirl It was so awkward but cute too. It gives your videos it's own character. It's why we keep coming back to you!! Keep it up, Dianna!!
@@physicsgirl I found it hilarious
He should have given you a more elaborated transition then a slide one.
Damn I think I actually understood that. It's a bit like a car moving north at 60mph and you jump off south. Even though you jump south, you're still going north. Same thing with the light. It leaves the distant object still moving away from us, but eventually it works it's way to moving toward us at the speed of light
The difference is people can watch and see your jump, regardless how fast is the car moving. ;-)
I think its more like you jumped off when the car was still going 10mph, and by the time you ran back to us, the car was going 60mph, and it was much further away.
@@MrTrevortxeartxe And there's another difference. If the car is moving 10mph North and you jump off going 15mph South, you only have a Southward speed of 5mph the moment you leave the car. If light leaves an object doing lightspeed going 'North', the light travelling 'South' is doing it at lightspeed, no matter the opposite direction of the body it came from.
Nope think about it as the road stretching out, not the car moving. The car moving has no impact on the foton's speed, they always travel lightspeed
Imagine you keep jumping, every jump takes some time T, if during that time the remaining distance has increased by more than your jump distance, you'll never make it. This is creates the dividing line between the observable and unobservable universe.
I'm just going to watch your videos again. I've always enjoyed learning from you. Rest as much as you need but please don't quit. I'm sending good vibes your way. ♥
Fun fact: If the universe was expanding at a constant rate instead of an accelerating rate, then there would be no event horizon; light from every object would eventually reach us. This is called the "ant on the rubber rope" puzzle
Thank you John.
Wouldn't we have a big crunch as well?
@@michaelwachendorf2096
Plausibly yes.
@@michaelwachendorf2096 we should in theory, that is if dark energy decreases over time then gravity will eventually become dominant again
@@michaelwachendorf2096 Not necessarily. Hypothetically, you could balance matter and dark energy so that universe forever expands at a constant rate. I don't know if that'd be a stable equilibrium, but if it was attainable, things would forever recede at superluminal speeds, and from any point and any time, light would _eventually_ reach us. But if the expansion is accelerating, even just a little bit, an event horizon is formed, and that appears to be the real case of our universe.
I live in Argentina. My 10 year old daughter loved your video but she relied on my translation to understand it. You should make a channel with a Spanish translator in the audio. You would capture many children and adolescents in these latitudes. You have a great way to spread science. Keep it up.
Closed captioning perhaps?
But CZcams ... The captioning can be very inaccurate. Much like, say, Google translations are often inaccurate. This is 2022, where's my jetpack? Oh wait, that's right, we can't even get our own spoken words to come out correctly, nevermind something useful like major planet wide languages to be supported here on you tube... Seems what you've had to do, translate it yourself, is about as good as we can do.
I think your idea would serve well the needs of English as second language speakers of the world.
Til then, I'm just gonna wait around til the future gets here... Maybe then, we can work out the kinks of more accessable media options... And jetpacks!
Wow, You just made the LED light in my head go on! Thank you Physics Girl. You helped me understand the relationship between observed distance based on light speed travel time and the adjusted distance based on the expansion! Cool video! (Yes, 6 months late in responding but I just discovered you on CZcams). Catching up. (I think I may understand that Cosmic Event Horizon now: The Hubble Sphere is like a faster “shock wave” overtaking the slower “shock wave” of the CEH yet never catching up with it, yielding the effect of light in the CEH appearing to move away initially but eventually appearing to move towards us? Is that a change in the red shift? Or am I way off the mark?
For the first time in my CZcams activity, I watched a sponsor time in its entirety! That new 3M tape is actually pretty awesome!
About the video itself, amazing content as always! Mind-bending science always amazes me! Thank you!
haha yea same, its such a weird sponsor but it works great for this channel :D and the tech in that tape is really cool
I am currently attending school at south Albany highschool in Oregon, I was told by my physics 2 teacher mrs.Jones that this girl went to the same highschool and was taught by the same instructor. It’s great to know I have such an amazing physics teacher who can mold minds as great as the one we see in this video!
She’s so passionate about what she is explaining; I love it.
I'd love to go on a hike deep in the woods while getting deep into conversations
Its kind of cringe as well indunno feels like a quirky act
yes! I listen to her cause shes filled with joy when she's teaching it.
Just imagine being at a campfire where she is explaining all this confusing physics stuff
@@ypey1 You're right, it's acting. NOT that she doesn't get it but the channel is a commercial business.
I miss the Physics Girl
Thank you for helping me finally get my head around this really tricky topic!
She's so giddy when she talks about things she loves 😍 That's so cool and inspiring!
The Earth flat 🗺
@Eimi Eirene propaganda
Problem is, she is going with an "evolution" viewpoint ( saying universe is "billions" of years old). Scripture tells us God created it during the six days of Creation. So all her "science" is off.
@@jsims1617 Scripture and science has no correlation.
@@jsims1617 problem is, your “scripture” viewpoint is outdated propaganda to keep people placated. please explain how you think the world, the universe, was formed in six days in words other than “invisible sky daddy.”
This has just become my "go-to" method for persuading people that I'm smart.
Great video; clearly explained; with good use of props and diagrams to illustrate potentially confusing concepts.
5 STARS!
Sorry, I couldn't help myself. Granting stars on an astrophysics or cosmology video is empowering.
The smartest person I ever met said little to nothing..., just saying.
It's cool you couldn't help out. You have more important things to do. Like giving birth to Tony :)
This is the best explanation i have ever heard. You make it easier to understand. I miss you. We need you back Dianna so you can teach us more!! Hope your doing well!!
Lovely everything :) Explanations and the whole vibe / setup :)
I love how passionate and excited you are about all of this stuff, it is absolutely infectious and your videos are always a joy to watch.
The Earth is flat! There is no proof that the Earth is round and NASA is an anti religious organisation so don’t listen to them. Even Russian are atheist organisation, so you can’t trust them.
@@anntakamaki1960 The Earth isn't flat--it's concave. We live on the inside of a spheroid and the sky is only an illusion at the center of everything... tfic.
Discovered your channel recently and can't stop watching all your videos! Your passion and enthusiasm is palpable. And your presentation style is a perfectly unique blend of informative, quirky, and fun. Keep up the great work!
This is the first time I've come across one of your videos and I'm loving your enthusiasm here
I love the stuff you talk about u would be fun to figure out things you really get heavy.i have not met to many people who be heavy about a subject keep up the good work 👍❤❤
5:30 There once was a girl who was bright
She could travel much faster than light
She set off one day, in a relative way
And returned the previous night.
Perhaps the bright girl was Physics Girl.
This is the first time ever I hear a physicist saying that engineers are the best scientists. THANKS 3M!
Sheldon Cooper will tear you apart if you do not retract your comment.
That’s true because they solve problems than to believe without prove.
That's because they're a terrible physicist.
@@isaacstone7899 in defense ofPhysicists, they prove with their mathematical computations to back up their theories. As an Engineer myself, i feel insultated whenever Sheldon belittle Engineers... But i like the comedy of the show. Computations and theories are for scientists. Engineers put them to actual.
@@Dylon1981 both are less without the other.
Thereby neither is better.
Thanks for your video!! Great explanation!!
Great work!!!
Physics Girl, you are awesome! Thank you for making complex physics understandable. One question, if we are at the center of the observable universe then where is the actual center of the universe and is there anything there if everything is expanding away from that point? Sincerely, Dr. B.
I went to her CZcams channel a couple days a go and there was a post saying she's dealing with long covid. It bummed me out.
Try PBS spacetime as a companion series
"where is the actual center of the universe"
I don't think anyone knows where the center of the actual universe is, because we don't even know how big the universe is.
Every point is the center and no point I the center. Think of the surface of a ball if the ball expands. The universe is like that
Off course we are at the center of the observable universe, we set the boundary, but due to the vastness of the actual universe there is no centre at all .... And definitely not one we could ever ever find
Think
I ABSOLUTELY LOVE YOU YOUR CONTENT!!!! and so does my granddaughter!!! She’s 5 and we love doing your experiments at home. YOU ROCK!!!
My favorite thing in the world is when old people type on caps on the internet. Its this really weird cultural phenomenon. But like its very pervasive. I wonder if we can track the reason and inception.
@@nominalnostalgia1347 One reason could be eyesight difficulties. Don't let the small things distract you brother.
@@nominalnostalgia1347 With enough counseling/therapy you’ll eventually be able to move forward in your life… it’ll just take some time (lots of time in your case)
@@nominalnostalgia1347 ъеааyeaaaaaaaaaaaaaaaaaa
@@raincheck5892 eeeey that didnt sound nice
It's great to see your excitement when talking about cosmology , I see it in you and I know how you feel, I am 57 years old and have been into Science, cosmology and space since I was very young after seeing the Moon landings that was the spark for me. It is a lonely subject to be into because in all my years I have had very few deep conversations about cosmology and when you meet someone who wants to listen I just feel like I can't get it all out with the excitement. I still think and watch about cosmology, Science and space every day and am still as excited like you about it all.
seeing is one thing believing is another :)
I was talking to a guy who told me his onewheel had a malfunction causing him to nosedive and crash. I mentioned it could have been caused by a cosmic ray from a quasar or gamma ray burst billions of light years away in the far distant past. The conversation instantly went awkward and quickly ended lol. Your plight must be common.
Just discovered you.
I will follow you from now🥰
Amazing video
i recently found you, and i love love love your videos!
I love that sometimes it feels like I'm learning things at the same time as you and that you get as excited about it as I do.
Thank you!! I've been trying to comprehend this Astronomical stuff for decades...you just explained it in a way I can grasp! I'll watch again several times because I'm getting older & my brain doesn't retain knowledge like it used to...😎
Much love and positive energy to you!
Tanks for explaining such a difficult concept. Thats as I understood it. Best wishes and waiting for your next video.
This format is really great, you should do more of it!
Fantastic video, thanks! I think a more complex graphic would have been really helpful in describing the travel of light from beyond the Hubble sphere - my mind is still trying to put it together!
I always liked the example of walking on a travelator (flat escalator). You can only move along the travelator at the speed of light, but the fact that it itself is moving, means the sum total is moving faster away from the start point.
These explanations are amazing..how can you not fall in love with the science..
Absolutely brilliant format. Really enjoyed this video!
9:20 I've been doing some pondering and thinking of it as velocity rather than displacement makes a lot more sense. The Hubble sphere is moving away faster than the light is moving away. Once the hubble sphere overtakes the photon, then the displacement starts decreasing.
If you're at an opposing side of the Hubble sphere it would appear that the opposite side is moving at twice the speed of light? Everything is relative, so how do we really know how fast anything is moving? We could be moving at a million times the speed of light collectively and never know it.
3M also known as Minnesota Mining and Manufacturing Company. Their products are amazing and as a jewelry artist I use some of them to make my pieces. Love you 3M! Keep doing what you do best.
Does each planet in the universe have its own hubble sphere? In other words, if we were on a distant planet outside of Earth's Hubble sphere, would Earth appear to be the one that was moving away faster than the speed of light?
Yea. What he said.
Yes.
Yes, each location in the universe has its own Hubble Sphere.
Yes, each one is also called aHubble Sphere as the term describes the area surrounding a point/object in which things are not moving away faster than the speed of light. A Hubble sphere is the same size for all points/areas (as far as we know) and whilst it's based on a constant, its now looking like the universe's expansion is increasing, so the Hubble Sphere (volume) is expanding (probably), whilst the observable universe is expanding too!
@@JustinShaedo that is only theory. Not a proven fact. Nearly everything "known" about space is only theory.
@@JS-xi5nk The English definition of "theory" and the scientific definition of "theory" are VERY different. Just because you have a 'theory' of relativity doesn't mean it can't be proven factual. "theory" =/= non-factual
@Concrete1998 I'm not saying it can't be proven as fact. I'm merely stating it is theory/"speculation" until it is proven to be fact.
I've seen so many videos on this topic. And it still melts my mind
I really enjoy your videos and the fresh look at physics they provide. You're like the 'Taryn Southern' of the physics world.
Get well soon
You’re very loved
Thank you for all of the awesome videos
You explain things very digestively easy to fall keep it looking great work thank you
Love your work. It's rare that someone like yourself is charismatic and devoted towards higher learning. Very cool.
I've wondered this, thanks for explaining in greater detail than my thought!
I am so glad to continue to see the physics girl videos. I do hope see is recovering and one day we can rejoice when she is able to put out a new video. Best wishes for a full recovery.
This is a very informative episode. It caused me to question the calculations of time and space. The missing ingredient as it relates light and time is an equation called "The Inverse Square law of Light". Which is explained as: Light intensity decreases with distance from source to receiving surface (sink), and the rate of decrease is in proportion to the square of the distance between emitter and receiver. This is called the Inverse Square Law. How do you think this has an effect on the entire question?
Really well presented in an accessible and understandable way, even if my poor brain was hanging onto comprehension by its fingernails! 🤯Thank you for a great video
Please watch the older version of the cosmos with carl sagan. It has much more neatly packed information bits. This is just 3-4 times telling the same thing over and over to make youtube algo happy.
I have say she explained this terribly, bumerang really? Light's direction never changes rather universe is expanding slower and slower as the light is traveling so it eventually reaches us, it is like swimming against current that there is higher slope at the edge of observable universe so current is very strong. But still it isn't higher than light speed so it keeps traveling up the current and the slope decreases more and more so light travels faster even if the actual speed of light never changes. So even if actual speed difference between Earth and an galaxy at the edge of observeable universe is 3 times higher than light speed there is actually nothing moving faster than light speed rather current becomes longer as it is expanding in every point not just around that galaxy..
4:38 The Scotchlite is vastly used in motion capture because MotionCap camera takes profit of this specific property to reflect the light in the opposite direction. that's why they have multiple infrared LED around the camera.
I didn't know that! The retroflection is also all over street signs. I always wondered why they appear rainbowy sometimes, and now I know.
@@physicsgirl Also used as an effect prop in the 1982 movie TRON to make a (real life) helicopter appear computergraphicsy (although it's just referenced as 3M reflective tape). From what I can tell it was the first movie to do so.
@@physicsgirl Copernicus was wrong. You are the center of my universe. According to Newton’s law of universal gravitation, If I’m attracted to you, then you’re attracted to me. I’d really like to study this heavenly body😉😉😍😍😁😁
I'm not a physist so . But I listen to all the big names in this field and this mind blower is new to me. My humble point is I didn't know this and thanks for bringing it to my attention. Awsome,, Alex kowaliuk from America 🇺🇸 👌
I remember as a young teen when there was still a lot of auguring on whats happening that it came out that space was both shrinking and expanding, depending on the areas, but lately all the videos I'v watched all say its only expanding yet I'v never seen anything about it being wrong either. There was a few different pronounced channels that talked about both side being right, just that its doing both and not one or the other.
Very well put together, Thanks Dianna.
You're amazing! I can't get enough of your content.
I miss her regular videos. Get well soon physics girl! The world is praying for you
"Relative to us" is a critical phrase here. A person could easily fall into the misconception that all these spheres and bubbles and incoming and outgoing arrows of light around us in the center indicates an Earth-centered universe. It's mind-blowing to remember that everything you're saying about the positions and relationships of all parts of the universe, seen and unseen, and how things are moving slower or faster relative to "us," is true starting from any point in the universe--again, seen or unseen by us.
These were the thoughts I was having. We are part of that expansion and the objects we observe could be expanding with us in parallel rather than away from us. It is still good and thought-provoking content.
I love it when you blow my mind. Going to have to watch this again but it’s filled with fascinating concepts.
Sometimes I wanna cry feeling how little I know. We feel lucky to get such a mentor like you @Physics Girl.
You probably know more than me about something :)
pay attention in the science and math classes. of course, it could be too late at this point. u must accept indoctrination, which in itself will lower your IQ, before you will be taught some truths. i feel sorry for yall, because the one thing all these commies wont tell you is that there is a Creator. He not only creates, He stretches space. So, knowing that you'll also know that there no such thing as extra-terrestrial visitations, because living things cant cross the firmament..He lets you see very far, but we cant go there.
@@ahoksbergen *cough BS cough*
Ran across this video from a couple years ago. Please recover quickly! Looking forward to your full recovery.
Go girl like your video so much makes alot of sense
11:02 I find it especially touching that Diana appears to value the camera more than physics demonstrations and, possibly, her editor...
My brain had a hard time understanding the vastness of our universe.
I love how you genuinely get excited talking about this topic!
this is so amazing and mind blowing
I followed till expanding universe and hubble sphere/expansion, but when she explains light initially moving away from us and then entering back hubble sphere broke my head lol, well she assured us it doesn't make sense ha ha, so that's there. Love her videos, I hope she sees a speedy recovery. We need more content creators like this.
Love this format. Very smart for building emotional connection!
I do like the video and your presentation. It's truly down to earth. I remember when I was young of hearing that 60 miles an hour was the limit to the speed man to travel. If someone could travel faster than 60 MPH they wouldn't be able to breathe the air. It seems that man has been breaking barriers as long as we've been conscious. Thank You for giving me more to think about than I had before. Imagination is the key to all things.
I now have a pretty good grasp on the concept that everything in space is expanding/accelerating away from everything else in space, but what I don't understand then, is how some galaxies are still merging with other galaxies? i.e.: Isn't The Andromeda Galaxy supposed to be combining with us (The Milky Way Galaxy) in something like three and a half billion years or so? Why isn't Andromeda accelerating away from us like everything else in space is? I can't be the first person to ask this question, but I have never heard an explanation of this seeming 'exception to the expanding universe rule.' I would love for you to do a video explaining these kinds of apparent anomalies as our understanding of our universe continues to grow and mature.
Diana, Your videos are precious as are you. I hope your health is improving.
Even though I’m in nursing school right now pursuing my BSN, I love science and more specifically astronomy. The size of the observable universe is truly beyond amazing 🤩
Two things about the universe always get me thinking.. 1st is how small we truly are compared to everything we can see out there.. and 2nd is our place in time, is this 13.4 billion years at the beginning or end of the past 100 trillion years?.. 13.4 billion is such a small number relatively speaking, so where in time are we?. or did time cease to exist before this big bang.. and if so, how long did that last, lol..
@@MH-nc5jd if time had ceased, how could that 'timeless' period last for any period of time?
Zooms like the one at 0:28 never fail to give me goose bumps. It is astonishing that by simply looking into the depths of the sky we can reconstruct the history of the earth and the whole (expanding) universe. Truly awe-inspiring.
@@youngmom5586 🤬🤬🤬
@@Rick_Cleland it's a spambot, please just report it as spam or explicit content.
@@IanGrams 🤬🤬🤬
@@IanGrams I thought she was trying to represent space expanding so fast between her words that strange, new matter began popping up in our view . . . maybe I’m over-imagining things?
@@JTheMelon er, what? Are you upset I asked someone to report spam?
"Turns out the universe was bigger than we thought"
That's my quote for today. You blow my mind everytime I listen to you. All I need to know about the universe is that I am the center of it all 😋
Nice video. I kinda, sorta, almost think I understand it. Amazing just to think about it. Thanks much!!!
I appreciate this video a lot. When I think of the light of stars and galaxies taking so long to reach us, so long that they may no longer be here, it sometimes feels like looking at the ghosts of the universe.
It makes me kinda sad. Theoretically we could see those galaxies and stars but never know much about it. If that galaxy contained life we'd never know, and to other galaxies that far away our fate will eventually be the same. If there's life out all the way out there, either now our billions of years from now, we would never know each other existed.
Thank you. You really did explain this well, much better than most, not to take anything away from all the other great content creators. Mind blown.
Dianna, my 10 yr old son and I love your channel. I was always told that objects could not travel faster than the speed of light. I often argued this point with my physics prof (MANY years ago). I said, if the universe is expanding at the speed of light, doesn’t that mean that objects on the opposite side of the universe center are then expanding away from each other at twice this speed of light? Would you consider doing a video discussing the topic of the speed of light and how objects can travel faster than it, and what it means to the objects in our universe? Thanks!!
Still true, nothing exceeds the speed of light. And space doesn’t expand at the “speed of light”. It expands at a fixed speed per fixed distance, but it’s “cumulative”, that’s why things further away appear to be getting away faster.
But still nothing moves in space faster than light, there is no argument around it
@@HeliBenj That is the video she does did! She explained that it is not the objects that are moving faster the speed of light, but the universe itself within which they object is moving, that is moving faster than the speed of light. I thought she explained this very well. Still a difficult concept to gets one's head around.
Thank you! This is a decent explanation why the Hubble sphere is NOT a horizon, although you could have used a slightly more accurate figure of 14.5Gly (z=1.48).
However, @11:12 Gravity does NOT overcome the expansion of space. There is not tug-of-war between gravity and expansion. Space simply does NOT expand where it is curved (described by a metric other than the FLRW). The cosmological constant (expansion) is contained only in the FLRW metric which describes flat spacetime.
For the light that moves away from us and then back toward us, I'm imagining photons running at a constant speed on a treadmill that slows down over time.
I really like that you speak to the camera man. It's like you are speaking to me directly and most of the time, the camera man is answering what I would say 🙂keep up the good work !
Good job ! Keep going !
Such as a flashlight reaching out to the expanse of space the further it goes the light frequency gets stretched out. The further in the light travels the frequency gets stretched out you would actually have to take in consideration of the stretch out and have that into the equation to when the light frequency is originally starts to where it gets to its distance
Loving the discussions on the expansion theory, relativity & space time. Keep up the great work 🌟
For gnz11 we are moving faster than the speed of light isn't it 🤔
Signed my kids up for STEM classes and we had so much fun making chemical clocks and elephant toothpaste last weekend. Can't wait for the next one. I love seeing the excitement in my kid's eyes when they get their kits in the mail.
Thanks for doing stuff like this for your kids. My parents did the same thing and it's part of the reason why I'm pursuing a career in physics.
How do you sign up for this and how much does it cost? I'm on a budget bUt my daughter and I enjoy home projects so depending on how expensive it is I will find a way lol.
We watched videos on elephant toothpaste and she loves it. If I make one more bowl of slime I will go crazy.
A simple concept for the expansion is from shooting at a moving target. Learning to lead your target and estimate the distance involved is a local example of the same process as galactic motion.
Ok. That was a really good ad insertion. In fact, it was just about perfect. It told me stuff I had no idea about. It changed my understanding of 3M in a positive way. Because I trust and respect Physics Girl, the person, due to watching all these videos, that trust and respect has passed on to 3M the company. Now, whenever I need stuff, if I see the 3M brand on it, I will be inclined to buy it. I just hope I don't find out later today that 3M is a subsidiary of Nestle. Or vice versa.
For your shopping peace of mind, 3M is not a subsidiary of Nestlé.