Why Is the Night Sky Black?

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Assuming the universe is infinite and filled with an infinite numbers of stars, the night sky should be bright and not dark. This phenomenon, also known as Olbers' paradox, kept astronomers confused for a long time.
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Опубликовано:

15 май 2024

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Комментарии : 1,9 тыс.

@gamebrosyo347 2 месяца назад

"Light travels at the speed of light" Top 10 inspirational quotes of all time

@ItzRiyadh_2127 2 месяца назад

🗣️

@Mantra176 2 месяца назад

Sky is black at night cause the space STEALS the energy

@The_Divergent 2 месяца назад

The number of stars born is less than the dead star So now, the number of stars will decrease until it becomes void

@sirtopoftheworldegg 2 месяца назад

Inspirational quotes are motivating

@ItzRiyadh_2127 2 месяца назад

Bro in 40 mins 120 likes

@lunicid 2 месяца назад

imagine how bright it would be if you could see every single star and galaxy and everything else

@dumpsteronfire23 2 месяца назад

Turn off dark mode that how bright it will be

@apple_ilev5s 2 месяца назад

we would probably be fried cuz other stuff like radiation is also coming at us, but the atmosphere might deflect it

@nicocola284 2 месяца назад

24th millenium tourism

@jjquasar232 2 месяца назад

MY EYES!!!

@Servenifer 2 месяца назад

discord light mode

@Reversely 2 месяца назад

To add to that, despite having these many stars, the universe can be accurately described as "empty" more than it is "full".

@laniedmd1126 25 дней назад

Why you're describing my wallet like that 😭

@captainnakou 2 месяца назад

thank you kurzgesagt team for keeping the amongus meme alive

@Playlist_Creator_ 2 месяца назад

dont forget party crashers

@AnimeSunglasses 27 дней назад

They spotted something that works GREAT with their art style, and by golly, we appreciate them milking it.

@AugustSeria 2 месяца назад

"OH MY GOD, Kurzgesagt! You can't just ask the night sky why it's black!"

@RangerMcFriendly 2 месяца назад

Don’t tell Twitter!!

@danielloewen2857 2 месяца назад

I didn't even get the joke right away😂 that's a good one

@FlatOnHisFace 2 месяца назад

"It's okay, fam. My parallel universe is also black. So, it's cool."

@Restart_Animator 2 месяца назад

* the night sky proceeding to fly at kurzgesagt at 2763 million miles an hour * : “I’m back, and I’m _b l a c k_ !

@lookame411 2 месяца назад

"OH MY GOD, Kurzgesagt! You can't just place an amongus!"

@justadot. 2 месяца назад

The among us figure was brighter than the whole night sky to me

@Freezagger 2 месяца назад

Purple at the beggining or end?

@Theguywhieditz 2 месяца назад

The amogus has killed all the light trying to reach us but cant defeat the sun

@KATORI_EMPIRE 2 месяца назад

"Purple was not the imposter." "1 imposter remains"

@TejomayGirhe 2 месяца назад

"Corn", a famous quote by purple.

@adrioumario1369 2 месяца назад

@@KATORI_EMPIRE *Red and Yellow stare in horror towards Green who said :"If he's not the impostor then kill me"* *Green smiles creepily as reactor starts melting down*

@Aploadtrack 28 дней назад

I love the among us guy in space😂

@BenWard29 2 месяца назад

Technically, space isn’t black. The blackness of space is actually microwave light that’s very low frequency and very dim. Once this microwave background was visible- a visible orangish glow from every direction.

@warcraftlake7 2 месяца назад

so everything used to be mexico?

@gowhite 2 месяца назад

@@warcraftlake7 Lol

@BenWard29 2 месяца назад

@@warcraftlake7 Or your mom. I heard she was quite orange.

@suspicioussand 2 месяца назад

Long ago, the sky was always bright, but it was too op and the devs nerfed it

@Kevin-cf9nl 2 месяца назад

They nerfed it by reducing the frequency - you can still see it, if you use a microwave radiation detector!

@41-Haiku 2 месяца назад

@@Kevin-cf9nl Smh these hacky patches.

@outofthebox9699 2 месяца назад

We got day for that

@adamindra5127 2 месяца назад

expalnation universe in the nut shell

@mrsquid_ 2 месяца назад

i don't think it was overpowered, they got a shitload of complaints about the lack of darkness

@jbassstrat 2 месяца назад

Also our eyes only see a tiny part of the light spectrum. After long distances, the light is red-shiftted and we cant see it

@FlatOnHisFace 2 месяца назад

I get that from Mexican food.

@anthonyscottventresca 2 месяца назад

I was looking for this comment! Glad someone else is aware that there are many different light spectrums being emitted that we can't see with the human eye. There were several studies done on the "dark" areas of space and they had the light spectrums converted into the visible range... It was amazing 😊

@schizotistic 2 месяца назад

I think that's what they were trying to imply w the part about light waves being stretched bc of the expanding universe, they just simplified and kind of lied by saying the light "has less energy and is less bright," lol

@plzletmebefrank 2 месяца назад

Yeah... Pretty sure that's a lot more of the answer than what the video gave.

@FlatOnHisFace 2 месяца назад

To be fair, my Mexican food joke was a lot better before the OP was edited.

@gncerqueira Месяц назад

the fact that there is no atmosphere in the universe helps on that too, the light doesn't have enough material to disperse itself like in our atmosphere...

@DrippyWaffler 2 месяца назад

I just did a lab in my astro paper where we calculated the hubble constant based on the apparent brightness of distant galaxies! Was very cool.

@calihhan4706 2 месяца назад

My dad always said, you should turn the light off where you don't need it.

@Theguywithspectacles 2 месяца назад

And that inspired you to make your future dark

@Hr1s7i 2 месяца назад

Wise man.

@Zqily 2 месяца назад

@@Theguywithspectacles broooo 😭

@Theguywithspectacles 2 месяца назад

@@Zqily that wasn't said on purpose I swear😭😳😏😏

@user-nv3eh6ni6b 2 месяца назад

just stopping by for my weekly existential crisis

@Gold6240 2 месяца назад

We have tea, coffee and cake in the back. Welcome back.

@lemonsalad8590 2 месяца назад

i wonder how much engagement a bot would get by commenting this on all kurzgesagt videos

@user-nv3eh6ni6b 2 месяца назад

@@lemonsalad8590 probably a lot, but luckily I'm not a bot

@kel6127 2 месяца назад

These videos are more interesting to me than "existential"

@chill-warlords 2 месяца назад

Please stop this brain rot

@last_vain4014 2 месяца назад

Fun fact: some of the stars we see at night are just the remnants of once a living sun, their light travels in the expandng space for so long the actual star it's there anymore.

@YounusRizwan1 2 месяца назад

Nobody talks about the random imposter in space

@heartorange3365 2 месяца назад

Among us crewmate:oh no i be voting out.

@fep_ptcp883 2 месяца назад

The night sky is black to our eyes, but it glows brightly in the microwave part of the spectrum (CMB)

@outofthebox9699 2 месяца назад

Thats dumb, no use to use for that, its so low in energy

@colbyr7811 2 месяца назад

No use to use for use@@outofthebox9699

@joshuasams8578 2 месяца назад

@@outofthebox9699 ..what?

@WindsorMason 2 месяца назад

@@joshuasams8578 clearly use means use as in use use use and use use with use use use use

@Neo-vz8nh 2 месяца назад

I wouldn't call that brightly. Any radio source is brighter then the CMB, including the whole Milkyway region. The Milkyway is brighter in visible too, but it is not bright. Or well it is a matter of perspective, but now you have an idea about how bright it is.

@r.f.chicken316 2 месяца назад

“Who the fuck starts a conversation like that I just sat down.” -peter griffin

@remmiedoesvr532 2 месяца назад

I read in an astronomy book once that said “The sky is dark because the universe is young.”

@TheAwsomeSawse 2 месяца назад

13.8 Billion years seems extremely young to me on a galactic scale. Fermi paradox could be as simple to explain as we’re just early to the party.

@TrueWolves 2 месяца назад

That is one of the possible answers. Also supported by the Grabby Aliens hypothesis.

@colinburke8389 2 месяца назад

We are the Old Ones, or will be. Civilizations in the far future will either be uplifted by us, or marvel at our ruins and lost wonders.

@christoph7510 2 месяца назад

I think you mean cosmic scale

@_TriGN 2 месяца назад

yeah but it only took 4 billion years. i feel like definitely intelligent life out there thats 10b years older than us

@BrawlLegendLink 2 месяца назад

@@colinburke8389Or we might just get erased by a huge meteorite or nuclear war.

@MewPurPur 2 месяца назад

There's also the fact that the Universe's expansion is accelerating (possibly approaching exponential growth, as dark energy dominates more and more). If its expansion were consistent, light from further away would still eventually reach us, it would just take a longer and longer. But it's not, so eventually, we will stop seeing stars far away.

@thewatchmenz 2 месяца назад

james webb telescope images also show the edges of its most distamt photographed areas to be very dark as well, means the universe is infinite

@thatguygold 29 дней назад

Why wasn't the inverse-square law mentioned? Whenever I wondered about that, I always assumed that the stars were simply too far away to be anything more than a dot and weren't close enough to light up the sky properly.

@Thailandball1234_gaming 2 месяца назад

US cops after watching this: *_"Where is that black star?"_*

@ashazansari2587 2 месяца назад

Imagine running across the universe just for the human to close his eyes

@ayaanahmad_ 2 месяца назад

Underrated comment lmao

@lubomirkubasdQw4w9WgXcQ 2 месяца назад

oh nevermind i get it

@b0xman935 2 месяца назад

Sums up light pretty well

@TheKane001 2 месяца назад

Because the white night is busy saving princesses.

@Vermiandr 2 месяца назад

That's a good one, actually! 😃

@Syntaxxed 4 дня назад

the absolute joy of learning this in class and later seeing it in a kurtzgesagt video 😍 First sentence (why is the night sky black) had me immediately saying 'olbers paradox' lol

@Coaster_dude 2 месяца назад

Probs the mail man

@yelbz 2 месяца назад

Without light pollution, you could see the galaxy

@aamirrazak3467 2 месяца назад

if only light pollution wasn't so common and everyone could see the stars and galaxy where they were

@Darkfreed0m 2 месяца назад

On clear sky days, yes.

@taliqq 2 месяца назад

@@Darkfreed0munnecessary comment

@anonymity1101 2 месяца назад

People in olden times could have seen the galaxy more clearly when there was no light pollution.

@The_Observer_god 2 месяца назад

Yes, only if we have not invented light bulbs, damn you Edison.

@DavyCDiamondback 2 месяца назад

“Well, once there was only dark. You ask me, the light’s winning.”

@buck_swope 2 месяца назад

based pizzaman

@devdpro 17 дней назад

Nothing can be brighter than discord's light mode 🗿

@SketchFromFlipaClip 2 месяца назад

For anyone who doesn’t understand Basically the stars light hasn’t reached earth yet even if it’s the fastest thing in the universe which also explains why big stars that look like they should be dead by now aren’t dead

@jonathanhall5061 2 месяца назад

Redshift only explains the color, not exactly the full energy content. That can be explained by the fact that light simply gets more diffuse with distance, until only a few photons are headed exactly your way. At that point, they get drowned out by the brighter light sources.

@narfharder 2 месяца назад

It seems to me the overriding factor would be: even in an infinite non-expanding universe, wouldn't the incidental absorption of light limit the viewing distance? Like, how far can you see in the fog?

@jonathanhall5061 2 месяца назад

@@narfharder Yeah, pretty much.

@juliavixen176 2 месяца назад

Wavelength (color) *_IS_* the "full energy content of light" E=hf

@appleducky5234 2 месяца назад

@@juliavixen176 E=hf This is the energy of a single photon. If you are at Mercury, you get hit by a lot more photons than if you were at Neptune.

@AlexanderShamov 2 месяца назад

The energy of each photon decreases as it gets red shifted. Another equivalent explanation is that the expansion of space means that the same total energy content gets spread out over a larger area than it would in a static universe.

@bjbarlowe 2 месяца назад

“Assuming the universe is infinite” That is an absolutely enormous assumption.

@user-bj4xr6ph4c 2 месяца назад

an infinitely enormous assumption

@jimsmith3715 2 месяца назад

Wasn't an assumption

@skz5k2 2 месяца назад

(but a little more than 100 years ago it was the common idea about the Universe)

@PaulHobbs23 2 месяца назад

The universe is most likely infinite, unless somehow it’s not.

@skz5k2 2 месяца назад

@@PaulHobbs23 Nope, it is finite, in space and time. One thing is infinite, another is limitless

@dave4253 2 месяца назад

"why is the night sky *BLACK?"* hit me like a truck lol

@alexanderthef8 2 месяца назад

It feels like the two different infinities where there's an infinite number of stars but there's also an infinite amount of space as well

@AvidYTuser 2 месяца назад

Istg the among us started to get on me💀

@georgeofhamilton 2 месяца назад

Timestamp?

@R0DBS 2 месяца назад

@@georgeofhamiltonit’s in the beginning

@luuketaylor 2 месяца назад

Dear Kurzgesagt, I'm an ESL teacher in Korea who is lucky enough to have high level students who can understand your content (mostly!) - thank you so much for all your work. ❤ I've been watching you for a decade now.

@kanjo4976 6 дней назад

*My dyslexic brain* “Why is the nice guy Black”

@thepeakfictionguy 2 месяца назад

i heard "Why is the nice guy black?" when i wasn't looking at the screen lmao

@User-A-F-I5I1218AUTTPAYFGA 2 месяца назад

'Light Travels At The Speed Of Light' Ahhh Yes The Floor Is Made Out Off Floor

@Chilling_pal_n01anad91ct 2 месяца назад

*in vacuum Actually, light slows down in transparent matter. Like, I heard of material that slows down light 60,000 times.

@Apollorion 2 месяца назад

@@Chilling_pal_n01anad91ctBut that is then still it's speed of light.

@jamesdriscoll_tmp1515 2 месяца назад

I hope they are watching, because I'm doing it as hard as I can - some photon

@systemG3000 2 месяца назад

And yet we have people on youtube comments arguing that 1x1=2 because some insane hollywood idiot said so

@AncientBacon-2024 2 месяца назад

“The ones in here are small, but the ones out there are far away.” Father Ted Crilly

@0GBrooklyn 2 месяца назад

The big bang was actually a big super nova, which was caused by the amount of mass that consumed all space fabric which caused gravity to decrease to a point the star fell apart.

@juliavixen176 2 месяца назад

Supernova are completely different from the big bang.

@Darkify暗 2 месяца назад

Supernova is like when 2 neutron stars collide and create a gigantic shockwave+explosion, with a diameter of around a lightyear or less. The big bang theory is about the instant when all the cramped atoms can no longer fit in one tiny space as the mass and space ratio is too much, thus creating a huge expansion

@juliavixen176 2 месяца назад

@@Darkify暗 That's neither what a supernova is nor what the big bang is.

@novishield 2 месяца назад

Bro has saved my science grades more then I’d like to admit

@Malikimusmaximus 2 месяца назад

It's a beautiful and crazy Universe out there

@M3pul 2 месяца назад

The hidden AMONGUS brings me so much joy

@DrummerrDuckie 2 месяца назад

"Lights travels as the speed of light" gives the same vibes as "every 60 seconds that passes in Africa, a minute passes for the rest of the world"

@Danilo02Theo 27 дней назад

And the light is slower than the space-time expansion too.

@billberg1264 8 дней назад

Yeah, for sufficiently distant objects, the distance between us is increasing faster than the speed of light. The light's not going to get to use if it's effectively making negative progress.

@anonymusmuggle 2 месяца назад

It might've been relevant to add that because of the accelerated expansion of the universe, the observable universe is in fact not infinite, but bounded by the cosmological event horizon with radius ~46,6 billion light-years. Hence, the number of stars in the observable universe is not infinite, but ~10^22, so no bright white sky.

@Idiotdragon8 2 месяца назад

Well, the observable universe isn’t infinite. From what we know, the universe is possibly infinite.

@anonymusmuggle 2 месяца назад

@@Idiotdragon8 Precisely. But since the observable universe is the patch of space from where light may be able to reach us until the infinite future, it is physically *impossible* for anything beyond to ever interact with us. Hence, we will always remain physically limited to a finite number of stars inside the observable universe. That's what I'm trying to say.

@_Joeking 2 месяца назад

The sun dying in 20830283932893827283 will be the biggest event in the universe

@user-fn3gb5mh5q 2 месяца назад

The caution after destroying the flower is great

@mateuszkuczynski55 3 дня назад

Damn the olber guy with the bright eye lookin' like he gunna give a bad time to someone

@FactsRandomizer 2 месяца назад

Kurzgesagt has two Sides 💀

@elenthd4542 2 месяца назад

What one side?

@shenrinkisotsuki 2 месяца назад

Kid Named “Night Sky” : 👁️👄👁️

@frostsparks7472 2 месяца назад

“Why is the nice guy black” is what I heard the first time😂😅

@NeutralGuyDoubleZero 2 месяца назад

Fun fact: Because of lack of light pollution, night was much more blue toned than pitch dark before electricity. This means Shinobi actually wore dark blue and not black to blend in.

@adventurefighter7501 2 месяца назад

There’s also a finite number of photons. If a point of light even produced 1.2^100 photons in a 360° direction, at a far enough distance from the point of light, the gap between each photon might start to be noticeable (say 0.01° apart) and so it’s dimmer.

@juliavixen176 2 месяца назад

Photons are not exactly "things"... What's happening is that the amplitude of the wavefunction drops by 1/r² with distance... so the probability that you will have a photon interaction at your detector becomes less... but there's not actually a localized "photon" flying through space as a discrete point particle. (It's a wave of probability. )

@juliavixen176 2 месяца назад

So... the thing about this argument, is that it doesn't matter if the light spreads out, because if you have an *_infinite_* number of stars there should be light from every possible point in space you can see.

@Azravald 2 месяца назад

@@juliavixen176 if there were an infinite number of stars but all at an infinite distance away, the light teaching you would be negligible. So in reality there are some close enough to see and others really dim and still others (we're assuming at this point) far enough we can't see them. If we can't see them then they're not lighting up our night sky, hence the darkness. It's not about the total number of all the stars that possibly exist, just the ones close enough to see.

@juliavixen176 2 месяца назад

@@Azravald I don't think you appreciate just how much _infinity_ is. (This whole thing was from over a hundred years ago when people thought that the universe was infinite and eternal, before stuff like cosmological red-shift was discovered. )

@Azravald 2 месяца назад

@@juliavixen176 I'm saying it doesn't matter how big infinity is...

@MrCommentGod 2 месяца назад

Pointless knowledge of the day: *This RU-vid short is exactly 58 seconds long*

@zodiactg 24 дня назад

New fear unlocked: The sun going dark

@barba5209 2 месяца назад

*Casually talking about our star exploding and our civilization being destroyed*

@Tactical_Nerd_Clash 2 месяца назад

The waves stretch out - redshift

@KeshavYadavgggvds 2 месяца назад

Is it like wear and tear of light? How is light losing its energy just because the space around it is expanding

@Chilling_pal_n01anad91ct 2 месяца назад

@@KeshavYadavgggvdsspace expands inside waves.

@indikulkarni7781 2 месяца назад

@@KeshavYadavgggvdsthe length of the light wave increases, as with all other lengths in space. since energy decreases as wavelength increases, the energy is reduced, and light is redshifted.

@KeshavYadavgggvds 2 месяца назад

@@indikulkarni7781 thanks🥹

@CamReddishFitnessOfficial 2 месяца назад

The night sky keeping you big as hell

@user-vg2ld3mn6p 2 месяца назад

"Light travels at the speed of light" Same energy as "Honey bees make honey" Last 3 words there were the swag messiah

@helenmoulford5644 2 месяца назад

YOU CANT HIDE THAT MINI CREWMATE FROM ME

@Esponea_482 2 месяца назад

Imagine if the sky… was pink

@Movie-xz3hw 2 месяца назад

Imagined 👍

@suhnih4076 2 месяца назад

Pank

@calihhan4706 2 месяца назад

No one really knows, if our perception of colors is the same. Brains do whatever they want. Imagine the color 'black' you know as black would look like your color 'pink' for someone else.

@juliavixen176 2 месяца назад

The CMB was orange when originally emitted.

@MrCommentGod 2 месяца назад

Space is dark Even with a giant ball of light

@Idiotdragon8 2 месяца назад

Because space is empty, and to see something there has to be something for the sun’s light to reflect off of and reach your eyes. There isn’t much in that black void between celestial bodies for light to reflect off of, so it remains black

@ethanbrown4656 2 месяца назад

@@Idiotdragon8⁠⁠⁠⁠⁠if the universe were infinite, that would mean that every single patch of sky would have an infinite amount of stars in it. Even if they were all dim, the infinite amount of stars would make the sky bright. The answer, as said in the video, that there has not been enough time for the light of those stars to reach us.

@Idiotdragon8 2 месяца назад

@@ethanbrown4656 I was talking about just the Sun there, but the time it takes for light to travel also factors in.

@fulvio3211 29 дней назад

It's almost the same asking "why that skyscraper with 100 windows all with lights on don't produce enough light to light all the neighborhood and the streets?"

@Omar-nd2bg 26 дней назад

Isn’t anyone concerned about the Among Us figure flying in space he must be the imposter 😂😂

@FacterinoCommenterino 2 месяца назад

Today's Fact: The world's largest living organism is a fungus in Oregon, which covers over 2,200 acres.

@Naksug_1 2 месяца назад

Racis- 💀

@ABSTREKT 2 месяца назад

Also the expansion of the universe gets faster and faster, and some distant galaxies are outside of our "visible universe", which means that the light from them travels slower than the expansion of the universe, and we will never be able to see them

@eristic1281 2 месяца назад

Lots of the lights won't hit us because they're coming from outside the hubble volume. Lots of the lights do hit us but they're not visible to the naked eyes due to the dobbler effect. Some of the visible lights don't reach the ground because they're blocked or scattered by the particles in our atmosphere.

@gevinblue 2 месяца назад

not one soul better turn the “why is the night sky black?” into a reel 💀

@Royal_Cadet 2 месяца назад

Why is the night sky black? ❌ Why is the nice guy black? ✅

@CorpusGreed Месяц назад

"GET OUT OF MY HEAD!" "GET OUT OF MY HEAD!" "GET OUT OF MY HEAD!"

@Infinix_kitBR777 Месяц назад

THE PARADOX! (complete with the reference of the paradox from excision)

@Shin_Godzilla_H1 2 месяца назад

"Well the sky is black so it can say the word!"-My brain/head

@haikjeft2767 2 месяца назад

Us from Norway begs to differ for the summer. The night sky is infact not black for us for more than 2-3 hours of the night at Bergen which is relatively south in Norway.

@toxi101yt5 2 месяца назад

well yall are still pretty north so the cycle's different for people more south

@haikjeft2767 2 месяца назад

@@toxi101yt5 Oh yeah! That is why i wanted to make this comment so i could inform others about that fun little fact.

@psycholamborghini4828 29 дней назад

I have a feeling that in every space related video there will be a hidden mongus

@10dai 2 месяца назад

Your animators are amazing

@sarthakthetech785 10 дней назад

That amongus in night sky is sus 😂

@AlekzanderTamayo-ln8bf Месяц назад

I love the attention to detail here

@andrewkvk1707 2 месяца назад

The density of stars in space, and the fact light loses concentration due to the inverse square law, means the sky would more than likely still be pretty dark regardless of how old the universe is and even if space expanding didn't shift the energy of light. Would it not?

@juliavixen176 2 месяца назад

The argument is that with an *_infinite_* number of stars, every single ray of light in every possible direction should intersect with the surface of a star... everywhere.

@iamtitansanchez 2 месяца назад

This taught me more about space then elementary middle and high school combined

@rishikashyap2089 2 месяца назад

Him: "Why is the night sky black" Average cops: "Allow us to introduce ourselves"

@dromnispank4723 2 месяца назад

Love the Impostor just flying through space! 🤣

@zardthedragon1896 2 месяца назад

What’s crazy is that some of the stars we see at night have actually died a long time ago and we are still seeing the light that it was emitting when it was alive.

@UndyingSOYAWER 2 месяца назад

"The light has been traveling at the speed of light" Somebody that I used to know starts playing

@DigitalDa5hgd 2 месяца назад

At The Speed Of Light by Dimrain47 starts playing

@I_am_infact_a_ni- 2 месяца назад

"The night sky won't brighter than it already is" Supernovas:

@Hr1s7i 2 месяца назад

There is also the problem with photons phasing out of existence when their containers lose enough energy. Bumping on stuff while travelling costs energy, considering they are moving at vacuum at immutable speed. At one point they will encounter something which will absorb them. Hell, I absorb photons as we speak, slowly getting a bit more tanned.

@moondragonsierra 13 дней назад

imagine trying to sleep with constant light

@MrAWESOMElol2 2 месяца назад

Not to mention that redshifted light turns invisible to our eyes in the infrared spectrum

@Piggies_in_cph Месяц назад

I’m such a tv addict when he said big bang theory I thought of the show 😭

@chrisprenmusic 2 месяца назад

The stretching of lights wave doesn’t just reduce its energy, it shifts it out of the visible spectrum all the way into the radio spectrum. So it’s not dark, it’s just not light we can see.

@michaelbrook4827 2 месяца назад

Amazing video, love the fonts & colors

@sheogorath979 2 месяца назад

Not only that, but the MK1 Eyeball just doesn't have the sensibility to discern the light from the faintest/farther away stars without help. Eye is too small, it's tailored for daylight, and even then it can only detect certain wavelengths

@VladimirChibuckov 2 месяца назад

Also, due to the stretching, some light rays are shifted into invisible parts of the spectre (like IR or UV idk)

@xTheZapper 2 месяца назад

If you think about the photons coming off a star as a sphere made of little dots, as you make that sphere bigger due to distance the gaps between the dots get bigger and also the chance that the photons will entirely miss your eye.

@justincoombs9048 2 месяца назад

It's really not about the stars when you think about it. The CMB used to be white. So even if there were no stars in that path, the stretch light concept preventing a white sky still applies.

@Gingerbred_Hed 2 месяца назад

My theory is that when the very first stars appeared, the universe wasnt as big as it is today, so theoretically, a night sky back then mightve been bright.