Hubblecast 96: How many galaxies are there?

Since Edwin Hubble discovered that the Milky Way is not the only galaxy in the Universe astronomers try to find out how many of them are there. This new Hubblecast focusses on the question “How many galaxies are there?” including the new numbers achieved in 2016.
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Credit:
Directed by: Mathias Jäger
Visual design and editing: Martin Kornmesser (martin-kornmesser.de)
Written by: Mathias Jäger, Eleanor Spring, Thomas Barratt
Narration: Sara Mendes da Costa
Images: NASA, ESA/Hubble, M. Kornmesser
Videos: NASA, ESA/Hubble
Animations: NASA, ESA/Hubble, M. Kornmesser, L. Calçada
Music: Johan B. Monell (www.johanmonell.com)
Web and technical support: Mathias Andre and Raquel Yumi Shida
Executive producer: Lars Lindberg Christensen

[@robertschlesinger1342]

This excellent video is something to think about at several different levels. First, 1.2 trillion galaxies! What then are the chances of extraterrestrial lifeforms? Second, when my father was born (about 100 years ago), no other galaxies were known. Note how far the sciences have advanced in that time.

[@ozdorothyfan]

When I was growing up there were an estimated 50 billion galaxies. The most recent estimate is two trillion and I expect that will continue rising as telescopes improve. Say an average 200 billion stars in each galaxy which is a relatively low guess. Say just an average 5 planets around each star which would give a trillion planets on average in a single galaxy . It's mind boggling.

[@ozdorothyfan]

​@@aaronehrhart2346 Can't say how far it goes, can only continue looking at what we can see which will be more as better telescopes come online but consider this. We're lucky we exist at this time in the evolution of the universe because in the distant future other intelligent civilisations will not be able to see what we see. The galaxies are all moving apart at an ever increasing speed. There will be a point in the future where they have moved so far apart they will be impossible to see. This will mean that intelligent civilisations in that time looking through their telescopes will see nothing but the stars in their own galaxy. They will be unable to figure out that there had ever been a big bang event. They will likely conclude what we concluded before we built telescopes good enough to see other galaxies. That was called the steady state theory. We thought the milky way galaxy was the entire universe and had always existed and somehow by some unknown process was continually creating new matter to replenish the stars indefinitely. A 'steady state' That changed in the early 1920's when Edwin Hubble using the best telescope of the time discovered that there were other galaxies beyond the milky way. LOTS of them. Future intelligent civilisations will not know this.

[@ekiskaliburnirvana9047]

Space is a hoax. Earth is flat and stationary

[@fitnesspoint2006]

@@ozdorothyfan yeah thats nice and all but that wont happen for another 10 trillion years. There is nothing lucky about the time period we live in.

[@ozdorothyfan]

@@fitnesspoint2006 Well I have read that it may happen in 500 billion years. And if you don't think that makes us luckier than any emerging intelligence around after that time no matter when it is we will have to agree to disagree on that point.

[@ozdorothyfan]

@Markus Patients When we all get out there and have a galaxy each. Plenty to go round.

[@juanasenjo8515]

The universe is truly vast. We can see only up to when some of the first galaxies came to be. Others, likely billions more, are beyond our most powerful telescopes. Surely, when the James Webb space telescope comes into use, more ancient light will be detected but not necessarily all. There is a point where this light will never reach us. The universe's constant expansion will forever hide these distant objects from us. Mind blown.!

[@ellobo1326]

Infinite...... forever..... never ending..... mind boggling.

[@hussainali9999]

Thanks, for highly quality work, video and information

[@johnroberts9560]

That sure is beautiful , looking at billions of galaxies ! 👍😃🌌📡🛰🔭

[@maobao9244]

marvelous voice, compliments !!

[@xBloodXGusherx]

This music mixes so well. Makes me want to go back in time.

[@geemanbmw]

Viq... yes along with her classy voice and the subject matter totally complete. Agreed

[@fog1962]

There is no beggining and there is no end...never starts and never stops

[@rustyangel3631]

Way beyond our comprehension and yet here we are living in this marvelous blue marble in its perfect habitat for life to exist.

[@bobflendorg1064]

How is it beyond our comprehension? The United States is about $80 trillion in debt. That's way more dollars than the number of galaxies in the universe. You can comprehend that, right?

[@geemanbmw]

@@bobflendorg1064 nobody can truly answer that question how many galaxies are in the universe. So dip shit keep politics out of this there's no comparison.

[@ramiroantunes5579]

Nice video!

[@YesNo-ub6ro]

INCREDIBLE

[@christinebethencourt6197]

Thank you Hubble and all his engineers 👍👍👍👍👍👍👍👍👍

[@mcmacshalfilya]

I can't say for certain about the other galaxies. But you must be the prettiest girl in The Milky Way..

[@peace5677]

Very nice Videos. Many thanks from Germany.

[@nobodysunderdog]

Come on, let's get the James Webb up and observing already!

[@a.citizen7668]

I agree. Let's see those bio & techno-signatures from our neighbors.

[@dr.lexwinter8604]

James Webb is totally vaporware, it's the Half Life 3 of science.

[@Carl-LaFong1618]

I say it misses it's spot at L2.

[@pauldean7690]

@@dr.lexwinter8604 was to launch in 1997 at a cost of 1 billion but now at 11 billion ??? & a suppose launch in 2021???. What a colossal waste of tax payers dollars, so many other projects were cancel due this junk sucking up most of NASA's funds. If I was Mr Webb and still alive, I would demand they take my good name off this junk

[@TheShootist]

Feb 2020. Still waiting.

[@martinruddell2682]

Mind expanding

[@ashutoshsonar7208]

Wonderful

[@DelightLovesMovies]

Thanks HubbleESA

[@ashutoshsonar7208]

Amazing

[@hossintohidi8634]

It's very beautiful.....every day more information than the day before....final I think there is no boundaries for univer....so never man can discover the entire universe.....

[@phishfearme2]

well said!

[@harishg8893]

Once again Nature has surprised us beyond our wildest imagination. Amazing.

[@9Ballr]

How many galaxies are there? Well, let's see, there's the Milky Way, the Snickers, the Three Musketeers...

[@rkernell]

And don't forget the best, the Nestle Crunch galaxy...

[@gmaneis]

and of course, the Ford Galaxy! Oh, sorry, you can't eat it!

[@rkernell]

@@gmaneis Well, you shouldn't eat it at any rate, the stuff gets stuck in your teeth...

[@johnnyaingel5753]

They are ENDLESS in a universe of MANY possibilities

[@justaguy4real]

I get so astonished and mesmerized looking to the stars, the cosmos so vast, dark and beautiful, yet so bright to be near the stars. Trying to imagine and comprehend the distances between as i look to the night sky, bewildered and mind boggling. They're so bright and huge celestial bodies up close, yet mere glimmering specks of light to us being that they're so far away. And the fact of the time it takes the best seemingly instant light taking so many years to get here being onky few in small bubble area to us amongst the so many times more within the Galaxy. But even trying to imagine the distances and even greater numbers of galaxies simply within the 'visible' universe with many many times more than stars within our Galaxy and all galaxies. And the galaxies so big it's like they've been called 'island universes'.

[@dannydonuts4219]

Infinite,with no end,ever.Hard to comprehend but inevitable.

[@lavianoantonio]

Love every astronomy’s documentary that’s been narrated by this lovely lady

[@jamescarter5042]

Astronomers are only scratching surface viewing the size of the universe. There is a lot more of the universe to be discovered.

[@gueedsmaia4429]

Our spirits traveling through the universe is the truly paradise where we will trip at thought speed till we drop on a new Earth again for a new physical experience.

[@williamhogan4031]

my head is about to explode trying to comprehend this....

[@jamesware5100]

im getting older every second

[@MrEditor79]

We need to build a telescope in space that's at least a million miles wide. So we can see what the aliens been up to.

[@carlpen850]

@ Old dirty bastard... take a bath or shower one a month whether you need it or not, then maybe you can be just an old bastard

[@edhoughton2609]

I think the aliens are being very naughty - especially the Nibble-Pibblies

[@rockiesecho8518]

You know what? The James Webb to be launched next year will surprise us big time

[@Sdetton]

It's fascinating and also confusing. When they say there "are" possibly 10 times as many galaxies in the observable universe, they reference the galaxies that are the faintest, that is, the galaxies that existed at the earliest ages of the universe in the past. The video then mentions that the number of galaxies has drastically reduced today because of merging together. For all we know, all those galaxies that were extremely faint don't exist anymore since we see them as they were so long ago (some going as far back as 13 billion years ago). At least we can say that the actual number that exist within the bubble of the observable universe "today" is somewhere between this upper bound of 1 trillion+ galaxies and the lower bound of 100 billion galaxies. That is... if cosmic inflation or other factors don't skew this number even more than we can predict. There are just so many more questions, but this is pretty awesome nonetheless!

[@dbartholemewfox]

Yeah, I found the explanation in this video confusing too. I think the idea is that just like the Milky Way has dim satellite galaxies, other large galaxies could have dim satellite galaxies, which are too hard for us to observe right now. In that case these observations of the early universe would just be additional evidence indicating that there are probably currently more (small) galaxies out there than we can see. And maybe we'll be able to observe them directly once we have more advanced telescopes.

[@badactor3440]

Many of those unanswered questions will be answered by the Webb device.

[@johnshilling2221]

A deceptively simple question: How many leaves are on the trees? (In the observable forests)

[@rwarren58]

There is only one tree in my forest, therefore I can say 678 leaves. With all due respect to the question (and the asker) ; A forest is not the universe, nor the grains of sand on a beach because I can conceive these things. I can not conceive the unimaginable scope of the Universe.

[@patrickball2493]

Or how many grains of sand in an observable beach .

[@onehitpick9758]

​@@rwarren58 There is only one leaf, and it hops time and space to cover all trees.

[@rwarren58]

@@onehitpick9758 Which came first? The Leaf or the Trees?

[@sarojinichaudhury179]

King Rituparna of ancient India could count them .

[@yozh5836]

Means there is more lives in the other galaxies. This is so amazing if u think deeply.

[@joecausey8508]

This video makes me want to watch a good science fiction movie.

[@EGuyMaes]

Any recommendations?

[@Blubb5000]

E. Guy Maes Dune

[@matthewcaldwell267]

120 BILLION GALAXIES that is just.MIND BOGGLING.

[@albertowusuansah8108]

The universe is so 🤗 huge and since the dawn of his the universe was very close.Now that is separating and moving farthest away from our observervable telescope 🔭.

[@iancrossley6637]

So, E. Hubble was able to resolve individual stars in other galaxies? Pretty good eyes there.

[@kamotekamote3002]

Even aliens has no idea on how big the universe is

[@ibone5028]

We will never know how big the universe is.

[@MrUltimateEgg]

don't say never, I'm sure that in the future we can look more than 13.7 billion years back into the universe so we will see what's outside of it. BTW, never stop dreaming

[@srk7479]

It's 93 billion light years big ... The universe

[@bro_street]

its 9.993.445.667.775 billion light years

[@dardanillyr3989]

MrUltimateEgg you know the universe is just getting bigger and bigger Right? So the light from syns far away will never reach us because the universe is getting bigger and bigger... so Even if humans something managed to live forever, we will never know How big the universe is and How many syns it is in the universe, because the light can’t reach us because the universe is juest getting bigger and bigger

[@MrSebboxxx]

@@MrUltimateEgg ... when we will look further back we will see the bigbang ...

[@paulstevens9409]

The vastness of space is so incredible..sadly it probably means different alien civilisations will never meet

[@chrismontreuil2206]

I agree. To far away. Must be that way for a reason.

[@XooXXooX]

What about the Alien races that are visiting Earth now? The info is out there, just search.

[@chrismontreuil2206]

Aliens are a myth and fantasy.

[@Remizay1820]

@@chrismontreuil2206 no they are not

[@geemanbmw]

Yeah the distance and time we might as well be alone

[@peterpekelo3779]

Every human being on this planet has thought of this question since the dawn of time. We are all the same... looking up into the sky at night wondering what’s up there........ and the most disturbing thing is, we will never know.

[@tigertiger1699]

🤔 yeah.. we have only known the other galaxies existed from Edwin Hubble....🤔👍

[@peterpekelo3779]

Tiger Tiger well...... we know they are there..... but we are far from knowing what the millions and millions of planets look like.

[@tigertiger1699]

Peter Pekelo Ok so I’ve clearly miss understood what “que” that you were commenting on.., I thought you were say that mankind has been asking as to how many Galaxies there are “since the dawn of time”... Which of course we haven’t

[@peterpekelo3779]

Tiger Tiger alright! But we know how many galaxies there are in the “visible” universe. What about the universe that is behind the cosmic microwave background. We don’t even know what’s behind there, might be another universe.

[@shahruzpakzad8603]

I've always believed the real number of galaxies is far far far more than we've always believed! And I'm not surprised that the estimated number by the scientists keeps getting bigger and bigger.

[@geemanbmw]

Agreed

[@MrThailik]

Thinking about the size of the universe makes my head hurt .

[@69demille]

A riddle or song we sang when young. “The bear went over the mountain, the bear went over the mountain , the bear went over the mountain , and what did he see. Another mountain., and what did he do. He climbed the other mountain and what did he see another. On and on. No ending. The universe.?

[@davidl9232]

Is what's causing holes in space, forces that change the frequencies of galaxies or areas various galaxies are in. Like when tuning a guitar, changing the tuning a string stretches or tuning a drum, too much tension changes or ruins the tone. Except it's all the physics, not simply sound or vibrations.

[@philipnorris6542]

As Douglas Adams says: "Space is big. Incredibly, mind-bogglingly big".

[@rudolphguarnacci197]

Great radio show, boring books, terrible movie. God bless Douglas Adams. Taken too soon.

[@fabianmckenna8197]

TV show was ok but didn't like the film.

[@gmaneis]

".....with 90% of the galaxies in our universe yet to be observed....." What? I wish a smart person reading this would explain what those words mean, because they seem comparable to the question once asked in Mammoth Cave: "How many miles of unexplored passageways are there in this cave?" Huh? Please don't call me stupid! I just don't understand this.

[@gmaneis]

@Markus Patients So true. Thanks.

[@parapitro8828]

TRILLIONS OF TRILLIONS PLUS ONE. As huge as it is, the number of galaxies you will quote will never be large enough.

[@patrickball2493]

A 120 billion galaxy,s in the observable universe . It does make the milky way galaxy a little insignificant .

[@Joskevandormael-yt9gy]

The milky way is one of the SMALLEST galaxies

[@rr7firefly]

120 billions galaxies in the observable universe. How could anyone have imagined that? And that may be only 10% of the total number. Gadzooks! Who can wrap their mind around that?

[@troybanger5168]

I want to be where Hubble has seen.

[@will891410]

Impossible to know, but much more than we can imagine.

[@Rafaga777]

Two trillion galaxies in the observable universe according to the most recent estimate.

[@autonomousexistence]

alborada777 Yeah, I'm seriously blown away. a trillion, wow! but now 2? it's just astounding and a marvel to even fathom such a vast amount of data. we have much to learn. who knows if there is an end at this point, lol. the future generations are so lucky. :)

[@TudorSicaru]

Yeah, I also wish I were born at a later time...I'm so curious of where we are heading and how will technology evolve...I'm sad that I can't find out...and I'll never will :(

[@autonomousexistence]

Yeah, I am with you 100% on that.😭 Seems like a technological symbiosis with man. colonizing planets and mining resources in space with self replicating machines will be a thing. Solar power should be our main source. That's if we dont destroy ourselves. Unfortunately, a lot of power hungry psychopaths are in control with nukes laced with war on their tounges. hey, at least we're not lion dinner, or born during the cruscades, or world wars of the past. Life isn't fair, but at least we're born in a curious time. If only we could know everything. We could only imagine and enjoy this existence as long as we can. 😊 to the future! 😄🙌

[@joecausey8508]

The key to seeing the future is to become immortal. Science needs to work on extending our lifetimes.

[@tulsikaste9868]

Really we will never know how big universe.

[@elie977]

1Cor 13:12-13: "For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known. And now abideth faith, hope, charity, these three; but the greatest of these is charity."

[@JodBronson]

*WOW, 120B and that is all we can " observe "! That means, there are " Countless "?*

[@JodBronson]

*120B Galaxies and that is all we can " observe "! = The Observable Universe - Just 1 Galaxy (Milky Way) = 250 Billion ± 150 Billion Stars - Just 1 Star (Our Sun) = 7± Planets - 1 Planet (Earth) = 7± Billion People.

[@earth26]

What if we are a cell inside a giant .

[@stimpy_thecat]

@xc5647321 xc5647321 rut roh!

[@ozdorothyfan]

@Markus Patients The first time I remember considering that I was round 5 years old or so. I had placed two mirrors facing each other and was looking at the reflection of each in the other. I could see that within each reflection it was mirrored yet again. On and on tlll it was becoming too small for me to see clearly. I began to wonder how far it went. If I could be shrunk down really small and follow the reflections how far would it go till there wasn't one? Would it ever end? Given a 5 year old child was thinking like that I expect we can presume humans were wondering how small things can be since they first reached our current level of comprehension. Therefore it's no surprise the ancient Greeks were contemplating it.

[@ozdorothyfan]

@Markus Patients Well this is the thing. It can't go on infinitely. The deeper each reflection I could see it was smaller than the one before it. It has to reach a stage where it's so small it can't get any smaller. And that's what my young mind was pondering, size not distance. Presumably if you could follow it down to a quark level then it just couldn't get any smaller.

[@earth26]

xc5647321 xc5647321 lol 🤣🤣

[@peterpickguitar]

We are in a swirling toilet bowl and its gonna go down the drain one day.

[@uploadcentral4872]

We lack the comprehension skill to understand how big it really is

[@punnasamamao1307]

We look forward to seeing the James Webb Telescope launched into space.

[@TehUltimateSnake]

*S O O N*

[@jimsmith1856]

And you think it matters what sort of 'phone you own.

[@ssbeebs]

Stand By..... I Still Counting !

[@ms1478]

لا اله الا الله

[@slickashton3250]

لول

[@layanmoharam6030]

صنع الله😍

[@openureyes]

I would say it's into the trillions it's mind blowing

[@johngear1415]

I like to imagine the universe is infinite. Even of the galaxys finish and it’s just darkness that darkness goes on forever. Or let’s say there is a wall all around it, there will still be something behind that wall going on forever and ever.

[@JohnWilmerding]

No walls!

[@harkamalpreetsinghWW3]

This idea was put forward by a monk centuries ago

[@mikerom9958]

What will we know in a thousand years time! That's also mind boggling. It worries me that I won't know, what we will know, in that time. What will they come up with?

[@karlrschneider]

Approximately as many as there are grains of sand on Earth's beaches.

[@badactor3440]

1.2 trillion galaxies in the observable universe. In a few years when the Webb device is up and running, there will be 10 times more galaxies.

[@nguyennam1945]

Chris Coyle i think it much more. Could be billion more and the light if theme never reach us. It like universe is infinity bigger than 94billion ly.

[@badactor3440]

@Todd Hageman 10 X 120 billion is 1.2 trillion. 1000 x 120 billion is 1.2 quadrillion

[@RetiredLover]

And after Webb, what new instrument will be developed to go further?

[@badactor3440]

@@RetiredLover there are currently ground based telescopes being developed that will make Webb obsolete in under 10 years

[@TheNeilDarby]

All insides have outsides just like all fronts have backs. The observable universe is inside something, which is inside something etc etc

[@freeinformation9869]

Yeah the current Big bang theory even says so, we just can't tell how far. It may be infinite, which is what most astrophysicists think.

[@iambox3432]

most logical sense to be infinite. I mean we will truly never know :D

[@rudolphguarnacci197]

@@iambox3432 Oh, I know. I know.

[@illtakethebox]

science has later revealed that the dark space between stars are actually fragments of exploded "memes", remnants of a distant past

[@ad-jv8bz]

No matter the cost we should upgrade the Hubble Telescope since it has given us hope for a unlimited future.

[@sfreddy]

No need, Brian. Other telescopes are in the pipeline. Better ones. James webb launches October 31, 2021.

[@raymondkreyer2664]

And somebody thinks it all happened by accident! Shows the pewny intellect of human species!

[@1john52013]

And we think we are so big and important. We aren't even a spec of dust in the grand scheme of it all.

[@rudolphguarnacci197]

Yeah, and how 'bout all the jerkoff supervisors we've all been under. Fuck outta heaya

[@iamthesupacwislol1406]

I don't think we will be able to answer how far the Universe goes becasue of Dark Energy, the Universe is expanding every second.

[@NamiduIndunel]

10 times more aliens to worry about xD

[@mariadaluzmoutinho5701]

O que está para lá do desconhecido?? um longo caminho de curiosidade que nos desafia e nos faz querer conhecer mais deste vasto e surpreendente Universo... O número de galáxias conhecidas é astronómico...mas será mais se souberemos o número exacto ...imaginar se terão formas diferentes .. quantas estrelas, planetas existirão..le uas, como serão os cometas, os asteróides, pulsares, buracos negros ou outros que desconhecemos??

[@jeromegoodwin3848]

How far apart are two of the most distant Galaxies that at opposite from each other

[@iengishu5]

One may ask how many oranges are on a tree but the more interesting question is how many trees are in an orange?

[@sameerabanu2553]

Only The Creator knows how many trees are in an orange. He, Who created the universe with such perfection has Limitless Knowledge.

[@johhnyglaze1]

My query is if the furthest image is some 13 billion years away, then what we see is an ancient image as it stood that long ago. So, how long did it take for that ancient image to get to that point? Just the day before? No. The image that was captured would take billions of years to form... The universe is way older than we realize.

[@philcoombes2538]

most recent info I've come across is light that has been dated by redshift to ~680m years post BB, so there is enough wriggle room in current spacetime models to fit everything in...

[@laragio]

Because we can't physically count every galaxy that our telescopes capture, the estimates could be wildly overstated. However, even 10 million galaxies would be incomprehensible.

[@ShacolateClown]

never had any interest in space untill i saw the series '' The 100'' and now im obsessed with it xd imagine one day. where we dont kill each other for money and all that bullshit. that we can actually invest in things to help our future. instead of working towards our extinction.

[@mudimabiriani6467]

what the name of the series ??

[@grant50]

Does this change scientists' thinking on whether the universe will continue to expand and suffer heat death vs. eventually collapsing back on itself to be reborn?

[@a.citizen7668]

If you look at the way galaxies are clustered, they appear to be blood vessels. We might be inside the body of a giant.

[@badactor3440]

Take it a step further and you will see that all of the galactic super clusters, when seen from a distance, resemble the spiral helix of Human DNA.

[@Goodtimes523]

What contains the universe?what is it expanding into?

[@jeromegoodwin3848]

HOW MANY? ALL of them that is how many.

[@mindofmayhem.]

The Universe stretches to infinity.

[@elie977]

Ps 147:3-5: "He healeth the broken in heart, and bindeth up their wounds. He telleth the number of the stars; he calleth them all by their names. Great is our Lord, and of great power: his understanding is infinite."

[@David-vn3mi]

Humans are forever bond to 🌍!

[@JohnWilmerding]

I have never understood how it would be possible to ascertain a number, any number, of galaxies. Putting a limit on how many there are would imply that the Universe is finite; that it has an end. The speed of light (i.e.: the visible 'red shift') does indeed limit the part of the Universe that can be observed, nevertheless how could there possibly be any limit at all? If there were a limit, then the Universe would have to end somewhere. What would that look like? No ... simple logic tells us that it is endless. There is not some big black wall somewhere, beyond which there is no more Universe. Yet our poor human minds, products of finite lifetimes, would have us think that the Universe had a beginning. What if it is just plain endless?

[@walker0196]

I am eagerly waiting for Jamesweb telescope

[@karlrschneider]

If we ever manage to prove that we are not alone in the universe, it will be a terrifying culture shock. I we ever manage to prove we ARE alone, it will be a terrfying culture shock.

[@TimU2Cool]

Just because we can see 13 billion years in the past,does not mean that's where the universe began

[@nerifterafrnam4682]

Can they count them again ? I want to name them.

[@willwarden1631]

There is one galaxy and there is an infinite number of galaxies.

[@rckc.1719]

trillions of galaxys and maybe billions of universes....can not wrap your brain around that...

[@ssnathan6099]

How many..? All of them..!!

[@ilovedumas]

Maybe we need to spread out a bit 👽✌🏼

[@tommcfadden2226]

Not likely, our life span is too short and our technology to limited to allow mankind to get anywhere in our galaxy let alone other galaxies. Even traveling at the half the speed of light it would take many generations to get to the nearest star let alone a habitable planet.

[@Ronin4614]

How can you not like this video? there is no politics and no one is being called bad names, so maybe that is why.

[@rudolphguarnacci197]

Why impose your beliefs on others?

[@bobbybo1245]

This sh*t cray

[@obbenauta7439]

Wanneer wordt de zon in ons zonnestelsel verduisterd? En trekt haar glans terug?

[@raghu45]

Given certain basic truths, which at once act as constraints, the concept of counting the number of galaxies in the universe is meaningless: * There is limit to the speed of information spreading- speed of light. * The expanding universe is moving away at an accelerated pace, faster by the day * The very space & time are not the same from different reference frames; simultaneity is relative. First we need to get intelligent enough to surmount these constraints before counting galaxies.

[@edwardjowett6153]

The Universe is contained inside the Cosmic Mind

[@honey4xi]

Then, we estimated there are 200 billion stars of bright stars in milky way galaxy based on visible light telescopes observed. Now, we estimated there are 400 billion stars of dim (brown) stars, glowing (red)stars, illuminating (blue), shining (yellow) stars, and bright (white) stars in milky way galaxy based on infrared, visible, UV telescopes observed. It is the same dilemma for how many galaxies in the universe. It will be the same dilemma for how many different alien species in the universe.