Deep Universe: Hubble's Universe Unfiltered

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Hubble Space Telescope

Hubble Space Telescope

11 yıl önce

Take a look at some of the most distant galaxies Hubble has ever seen, and find out why, when we look at the most distant objects in the universe, we are also seeing the cosmos' earliest objects.

"Hubble's Universe" is a recurring broadcast from HubbleSite, online home of the Hubble Space Telescope. Astrophysicist Frank Summers takes viewers on an in-depth tour of the latest Hubble discoveries. Find more episodes at

Hubble's Deepest View of the Universe Unveils Bewildering Galaxies across Billions of Years

Hubble's Deepest View Ever of the Universe Unveils Earliest Galaxies

Hubble Approaches the Final Frontier: The Dawn of Galaxies

Hubble Reaches the "Undiscovered Country" of Primeval Galaxies

In Deep Galaxy Surveys, Astronomers Get a Boost -- from Gravity

synthartist69 2 yıl önce
Best presentation of the deep field image I have seen. When you look at how vast the universe is, it's hard not to believe that there must be a ton of life out there in each galaxy alone.
Sureshan M K
Sureshan M K 4 aylar önce
@Joe Bob Jones yes.
Bill A
Bill A 4 aylar önce
Unless we can somehow break the speed of light, we're basically locked into a "space/time prison" forever due to vast distances. Realistically the only chance we have to contact any other intelligent life out there is via radio communications, however even that is a crapshoot given the length of time radio signals have to travel of each way.
Joe Bob Jones
Joe Bob Jones 6 aylar önce
@Approx We've only detected a few thousand, yes, but it was based on expanding the Kepler mission estimate of 300 million potentially habitable planets in our galaxy.
Approx 6 aylar önce
@Joe Bob Jones have we not discovered only about 4000 planets
Richard Shane
Richard Shane 6 aylar önce
I wonder how many GODs have participated in the creation of our visible universe? Then what force or phenomenon created GODs? The human experience while observing our visible reality has been fascinating... enjoy your ride through the cosmos everyone!!!
Academiclibrary 5 aylar önce
Wow!! So fascinating! Just can't wait to find out what the new James Webb reveals 😲 And the analogy between the development of a galaxy and, e.g., the growth & development of living beings is also quite profound.
Rotzfrosch 09
Rotzfrosch 09 Yıl önce
It's unbelievable. We live in strange, but also amazing times, I think. I've bought a telescope (a small one) in the last year. It is great to look at the sky at night and explore the miracles of our galaxy. I don't need a telly.
Ryohio 9 aylar önce
I love space, it's literally the most interesting thing about our small reality on Earth. It's so big it's unimaginable, and the forces and energies taking place out in space effect far more than we understand. It's so fun to ponder what's out there, especially realllly far away.
stvbw 2 aylar önce
@Ryohio the earliest galaxies are impossible to see as the light emitted from them can not travel faster than the speed of light. The universe is expanding faster than light their light will never reach us.
Abdallah 5 aylar önce
Surah Al Iklas
Ryohio 8 aylar önce
@dunruden craziest thing I've ever heard was Brian Cox(sp?) Explaining how telescopes use light to see objects really far away, and that they can actually look SOOOO FAR away, and technically sooo far back in time, that they hit a wall that they can't see past because it's so far back in time that Suns hadn't even been created yet to produce light.
dunruden 8 aylar önce
And the realisation that the further away it is, the longer ago it happened.
Ryohio 8 aylar önce
@Yamile Magubeni in the last few years of my life, I've changed my perspective on nature/life on earth, I view all that how I would if we found it anywhere else in the universe, I respect it much more.
booneygurl21 6 aylar önce
I've been having a hard time understanding the whole idea of how we could see into the past. You finally have explained it to me in a way I can fully understand and grasp. Thank you so much !
Mark Foster
Mark Foster 10 aylar önce
Just came across this and couldn’t help see the similarity with the physical appearance of galaxies and hurricanes as seen on satellite over the course of their development…the symmetry of things in the universe is uncanny. Great series, thanks!
Wilder Tapia Saenz
Wilder Tapia Saenz 10 aylar önce
Intrigued (and confused) by a Brian Cox doco and had to know more. Thank you for explaining this I feel like I finally “get” what Hubble is all about. Really well done, makes me appreciate how incredible the advances are that we are making in our neverending quest to understand space time... something truly inspirational about humankind to remember and ever more poignant in this pandemic geo-political mess we find ourselves in that brings out the worst of us
miniorek 7 aylar önce
This presentation was 10 years ago? Wow! I wonder what we discovered during those 10 years! Many thanks for this film and fantastic presentation!
Mary Fasano
Mary Fasano 9 aylar önce
The universe for dummies…and really fantastic presentation in perfectly simple terms for a very complex issue. Kudos!
Locarnese 6 aylar önce
Best presentation ever--clear, riveting, informative, without distracting effects or annoying music.
Peter Griffin
Peter Griffin 6 aylar önce
This is the most amazing video I've ever watched in my life. Explains the universe perfectly!
TripleRide675 9 aylar önce
Fantastic presentation! Very clear, easy to understand, and interesting. Well done!
Rare Bird 82
Rare Bird 82 Yıl önce
PS: The closer galaxies we see aren't necessarily younger than the distant galaxies. In reality they may be around the same age and look similar to ours, but appear older/different to us the viewer because of their relative distance from us and the time it takes their light to reach us. Literally looking back through time, cool 😎
Brad Wood
Brad Wood 2 yıl önce
It's so wonderful to come across a well made, informative video without a bunch of extraneous bullshit like music and tons of editing and bad graphics. More videos like this please!
Josh Skalicky
Josh Skalicky 7 aylar önce
no kidding some of the people on the history channel make the show almost unwatchable
loge10 Yıl önce
Could not agree more!!!!!
Peter Captain
Peter Captain 9 aylar önce
Just fantastic how this man explains the Universe. I have to see it again and maybe again because it is so interesting. Thank you for doing this.
Silver Surfer
Silver Surfer Yıl önce
Very well explained and a great educational tool, especially for novices (like me!)
Bjørnar Yıl önce
Impressive. Whole presentation shot in one go. And really well done - informative and fascinating.
Jon Dorsey
Jon Dorsey 7 aylar önce
I absolutely loved everything about this video. Learned a lot. The red-shift light thing was insane haha.
J CMurr
J CMurr 10 aylar önce
That was so well explained! It's impossible to wrap our heads around how tiny we are.
Jesus is LORD
Jesus is LORD 9 aylar önce
Repent to Jesus Christ!! “Jesus said to her, “I am the resurrection and the life. The one who believes in me will live, even though they die; and whoever lives by believing in me will never die. Do you believe this?”” ‭‭John‬ ‭11:25-26‬ ‭NIV‬‬
Big Dawg
Big Dawg 8 aylar önce
I can't stop watching these. I just love to learn and understand how the Universe works.
IrokoSalei 9 aylar önce
Space and the sky are amazing. You can make incredibly small portions of the sky and look at microscopic spots but you will notice that it contains an infinity of stuff. It is deductible from basic optics but amazingly represented here. It's like a concrete exemple of uncountable infinities.
RN Kim
RN Kim Yıl önce
I love this video... it is so beyond incredible to realize how insignificant out little planetary existence is...the things we think are SO important.... some people can divorce science from spirituality but I always find this incredible loving fascinating creator in science whether I'm studying the fantastic microcosm of biochemistry or the mind numbing macrocosm of the cosmos. and we figured out a way to see 13 billion light years ago, just amazing
SJL 11 aylar önce
I have always combined Science and Spirituality. Combined is Intelligence.
A C Yıl önce
but why would you think our existence would a insignificant f we have a loving creator? On the contrary, I see a lot of purpose.
Alfred Cheruiyot
Alfred Cheruiyot Yıl önce
Good job Dr. Summers. This opened my eyes... Thank you.
Dana Barnett
Dana Barnett 7 aylar önce
Wow!! So fascinating! Just can't wait to find out what the new James Webb reveals 😲 And the analogy between the development of a galaxy and, e.g., the growth & development of living beings is also quite profound.
Perineum Sunning Guru
Perineum Sunning Guru Yıl önce
Beautiful work. I understand the concepts put forth here. We are focusing in one direction and seeing the origins of the big-bang. Meaning, in expansion there is direction. My brain breaks down when trying to understand what the universe is expanding into?
Pradeep Acharya
Pradeep Acharya Yıl önce
Thank you so much Sir for explaining the Space science so lucidly.We can never know the Space & the mysteries hidden in it as it is beyond our comprehension. The more we look into the space,the more we are connected to the past.
Josh Rutherford
Josh Rutherford Yıl önce
this is such an absolutely incredible video. the things that are out there to try to grip the human mind onto is just so unbelievable I love it.
57smithers 11 aylar önce
Two questions I have thought of before, but this video brings it to my mind again. Once we are able to see the area around the Big Bang, that means there is 13 plus billion years on the other side. Would we ever be able to see beyond the singularly event, or is it moving away to fast? ALSO, how would we ever know the true direction of the point of singularity, What does it look like 180 degrees in the opposite direction of the Ultra Deep Field?
Kevin Bean
Kevin Bean Aylar önce
Nope. Sorry answered 9 months after query. The universe was opaque till many years after the big bang; that's what the cosmic background microwave studies show. You can't look back much more than 13 billion years, it's like a nebula or dust cloud. Opaque
Bill Walden
Bill Walden Yıl önce
I have never seen redshift explained this way. I have always been under the impression that redshift worked on the same principle as Einstein's train whistle. Einstein's train whistle had nothing to do with the expansion of the medium through which sound travels (air in Einstein's case). It had only to do with the velocity of the train relative to the observer. This explanation seems to rely on the expansion of the medium through which photons travel. My mind cannot grasp empty space expanding. Unfortunately that seems to be an absolute form of cognitive dissonance for me.
Dannys998876 Yıl önce
There are three mechanisms of redshift that arise from Einstein's Special and General Theories of Relativity. The light from relatively nearby objects may be redshifted (or blueshifted) as a result of their relative motion away from the observer or toward the observer. This form of redshift is Doppler or Relativistic Doppler redshift. On the other hand, there is a form of redshift that is observed in deep space astronomy, over vast distances, where relative local motion is negligible and the light travels across vast distances of expanding space. This is called "Cosmological Redshift", and its magnitude is proportional to the distance (time) that light has traveled from source to observer. This video describes Cosmological Redshift, caused by the expanding space through which light travels. Cosmological Redshift is independent of the local relative motion of the source and the observer (which is negligible at vast distances.) An astronomer viewing redshift effects inside the Milky Way or nearby gravitationally bound galaxies like Andromeda is viewing a Doppler Redshift. On the other hand, an astronomer viewing the light from galaxies at distances of hundreds of millions or billions of light years, is seeing Cosmological Redshift. Galaxies at the middle distance of the Virgo cluster for example, at a distance of about 50 million light-years, are close enough to see BOTH relative motion effects AND cosmological (expanding space) effects. So redshifted light from the Virgo cluster exhibits both Doppler and Cosmological components. The Wikipedia article titled "Redshift," describes Doppler and Cosmological Redshift in detail, as well as Gravitational Redshift, a third form of redshift which arises from General Relativity, as a result of the motion of light through gravitational fields.
Sweta S Mani
Sweta S Mani Yıl önce
Amazing! So humbled to see this. Very informative and so much to learn. Thank you
Herbert Renard
Herbert Renard Aylar önce
Congratulations Dr. Summers for this magnificent step-by-step clear explanation. On a scale from 0 to 10, among people I know, they would rate only from zero to one. I may be somewhat partial in judging myself but, I think I am a good 3 to 4. I am really happy with my understanding of your presentation. I look forward to a repeat performance concerning the James Webb telescope. Now my problem is to try to get my own brother and friends that are 0 to 1 interested in this. It may be a bigger challenge than looking for a Pre-Big Bang discovery.
Michael PRINCE
Michael PRINCE Aylar önce
Very interesting presentation. Had no idea the Hubble could see so deep into space. That was fun 🙂
Alan Geisdorf
Alan Geisdorf Yıl önce
I totally love how you explain things in simple ways, so that even blonds like me will understand. Being able to do that is a sign of a really good teacher. Thank you.
Paresh Mokani
Paresh Mokani 10 aylar önce
I am floored by the presenter's speech. He really describes things so nicely. Great orator. Loved the video too.
Josh Skalicky
Josh Skalicky 7 aylar önce
yah hes rad
Alistair D'silva
Alistair D'silva Yıl önce
The best 30 minutes of my time spent learning about space ..blows my mind
Adrian Copping
Adrian Copping 9 aylar önce
A fantastic explanation, thank you 🙏
Derek Havelock
Derek Havelock Yıl önce
The big question. At some point, will scientists see so far, to see another universe of galaxies? I'd say yes.
just me
just me Yıl önce
@Paul Nash Who thinks that our universe is infinitely large? There are different methods of measurement being theorized which give different theoretical sizes, but infinite isn't one. We are hindered by how far we can observe so beyond that is unknown.
Paul Nash
Paul Nash Yıl önce
If our's is infinite that does not leave room for others now does it?
Isaac Nehmad
Isaac Nehmad Yıl önce
Thank you so much for your explanations. Through you I learned so much and you made me want to learn more.
robert kelly
robert kelly 4 yıl önce
Breathtakingly interesting, clearly to me, it appears that the universe is infinite. Thank you for such an easily understanding documentary.
Victor Ward
Victor Ward 4 aylar önce
I thought this was a very mind blowing experience with your telescopes and thank you for all your effort and time with this that's awesome
Headgeo Yıl önce
Terrific! Very well done and presented for non-scientists.
kiran Patel
kiran Patel Yıl önce
Brilliantly explained and so simplified . My knowledge in Deep Space has increased many fold. Thank You.
Thinking Ronin
Thinking Ronin 11 aylar önce
It makes me profoundly sad to realize that almost all of these galaxies will forever be beyond our reach because of the accelerating expansion of space.
Ralph Angel
Ralph Angel Aylar önce
Give your life to Jesus Christ as Lord and savior and you'll be surprised what we'll get to experience in the new universe ✨️ 🙏 🙌
James Gatzke
James Gatzke 2 yıl önce
AMAZING!!! I have never had space/time explained in this manner. Makes sense and still mind blowing... the thought of looking back in time.
Penguin Scott
Penguin Scott Yıl önce
Fantastic. So much new info since I took astronomy in college. I'd love to have a sit down some day to talk and get some of my questions answered. This is great. And if I'm seeing this video made 10 years ago, how far away would that put me?
Stephen Packard
Stephen Packard Yıl önce
I knew of most of this stuff but I still could not stop watching! What a great video.
SkinSlayer26 Yıl önce
Wonderful, interesting, articulate presentation, loaded with information and without background music or noise. Who could ask for more? Thank you!
Random Ami
Random Ami Yıl önce
Magnificent. In my summary, and I had to replay some parts of the video, I gather the farther and less visible the galaxies the younger they are because their lights have not even shown yet. It’s such an awkward logic, but is the logic behind the universe expanding as we speak.
Yose Yoda
Yose Yoda 3 yıl önce
WOW! First time I watch an entire clip non stop and still understand what was being explained. So interesting. Thanks for the amazing work!
Suresh Kumar
Suresh Kumar Yıl önce
Seeing this video, I feel so bad for the delays the James Webb telescope has gone through. Think about all the data it could have collected by now. The narrator explains the Webb telescope will launch by the end of the decade meaning by 2020, yet it is still delayed. Hoping it launches successfully and we gain more insight into the universe.
Nick Cartia
Nick Cartia 25 gün önce
@Approx images are here HURRAAYYY
Approx 6 aylar önce
it's launched, first images will be around june i think.
Arya Asya
Arya Asya Yıl önce
Thank you so much for sharing this knowledge !! It is very informative and educative, knowing how you looked back 13 billion years ago.
TheOtherMike 9 aylar önce
Over 10 years old and still so very interesting.
Shreyas Maheswari
Shreyas Maheswari 6 aylar önce
Amazingly interesting presentation. Million dollar question still remains, is there life out there ?
stormthorn 10 aylar önce
hypothetically, what happens when you look into a point in space that truly has nothing in it at the farthest distance possible to view? Do you see the beginning of the universe?
Joseph Omelia
Joseph Omelia Yıl önce
Love how if a telescope on a planet 65 million light years away, was pointed back at Earth, the dinosaurs would still rule the planet!
Ryohio 9 aylar önce
Absolutely. Craziest thing I've ever heard about space, a scientist once said that they can look so far out into space (and subsequently back in time the further you look) that there's a point they can't see past because it's a point so far back in time that Sun's hadn't been created yet to create light.
MIKE TYTHON 11 aylar önce
@Hrm De Shazier no
lmf0114 Yıl önce
The best video I have ever seen! I'm a sky watcher. This video has opened my mind to the magnificence of space! There is always something new!! Thank you!
Gary Dixon
Gary Dixon 9 aylar önce
I just love it when i see a lady thats interested in space good on u girl when you hear a lady scientist they to me seem to keep me more intrested they seem to bring out something special i dont know what it is my ex would say gee thats nice Aaaaahhh Melbourne Australia
Andrew Naicker
Andrew Naicker 7 aylar önce
Watching this 10 years later in 2021 after James Webb has just been launched is so exciting!
Joe Smith
Joe Smith Yıl önce
I like this guy's presentation method. One thing to note is that when he said the more distant galaxies seen are younger, that assumes they were all created around the same time. It wouldn't work if we assumed they began forming at all different times. It's fascinating how certain things are: galaxies being born at the same time, galaxies being in a disk shape, much like solar systems. Cosmology is an fantastic and wonderful science. I hope in my lifetime they figure out the unknown forces or reason for the universe stretch.
dontmasktruth-92 Yıl önce
The real fascinating part is that they do exist in that form now, just as we exist in comparison to where they are in spacetime. The evolution of the universe is not carried out as a function of time nor space, but a function of space-time. Thus it is a single evolving organization of energy and momentum, but as entropy increases, this gives a natural asymmetry that splits the 'past' from the 'future', from the point of view of any observer that exists outside of the fields of the universe. If you were a massless part of a quantum field, you'd just be a smeared out wave function that has not differentiated from any other region of spacetime. This is what separates forces from objects; objects are composed of differentiated perturbations of the quantum fields, which may be described in different terms (hence the term differentiated). This creates a localized existence, aka a partial existence when compared to the bulk (which is non-local).
Julia Hash
Julia Hash 2 aylar önce
George Smyrnis
George Smyrnis 8 aylar önce
This video is a masterpiece as far as presentation, communication and teaching is concerned. This is how science should be taught at schools and universities!
Helga Heyck
Helga Heyck 8 aylar önce
Excellent & thorough presentation; clarified complex science for me.
Christopher Shipman
Christopher Shipman Yıl önce
Well presented! Thank you!
Raymond Parks
Raymond Parks 11 aylar önce
Great video. Love the Hubble. That James Webb telescope is still scheduled to be launched later this decade. It's an all new decade and we're all hoping to see the James Webb make it out of the clean room.
Janoy Cresva
Janoy Cresva 9 aylar önce
It’s happening in December!!!
Dannys9988776 11 aylar önce
Yes, NASA may actually launch it this time. The fully assembled telescope has been in California for final electrical tests and will be shipped to French Guiana by early September. Then it's a trip by sea through the Panama Canal. It is scheduled to launch at Arianespace's ELA-3 launch complex in Guiana after October 31.....probably in November......NASA says. Then the rocket flight a million miles into space to the L2 point on the other side of the moon. Hope it works! :-)
EMPEROR gaming
EMPEROR gaming Yıl önce
Love from India 🥰🥰 Thanks Hubble space telescope to give us very useful information 🥰🥰
Paul Keller
Paul Keller 2 yıl önce
Hands down the best presentation on the universe/stars/time I have ever seen. Thank you!
Tibor Purzsas
Tibor Purzsas 9 aylar önce
Watching this makes me wonder , among all those stars and galaxies how many wonderful civilization must exist/existed ? It is such a large amount of real-estate, its mind boggling! We can't even wrap our mind around it its so enormous! It would be amazing if we could meet some of those wonderful creatures! A series of boox comes to mind : The Rama boox by Arthur C. Clarke, and latter by Gentry Lee! In those stories there are all different kind of aliens that could exist out there ! They weren't attributed any kind of magical characteristics, some were very highly advanced, (the Octospiders, ) and some were not so much (the Avians) but they were all wonderfully written, as if they could really exist out there somewhere ! Too bad that most likely we'll never find out.. ...(
CreativeGuy 9 aylar önce
Okay, so if we can look further back in time with these telescopes, can we say, knowing the position and movement of the Andromeda galaxy, or any other galaxy, use these telescopes to observe areas of space that the Andromeda galaxy, or any other galaxy, used to be in, further back in time, to see the galaxy actually evolve? Simply put, can we target a galaxy, and use Hubble to find it's former position and photograph it as it used to be, though large periods of time?
Silk Lion
Silk Lion Yıl önce
When I see how many Galaxy's are there and try to imagine how big just our Galaxy is and actually our solar system. It makes it more clear to me, we must be the only intelligent life out there. No way nobody figured out spore drive out there.
LinYouToo 10 aylar önce
Really enjoyed this. Great job explaining everything is easy to understand language.
Emmanuel Asafo - Adjei
Emmanuel Asafo - Adjei Yıl önce
Great presentation!. Very easy to understand. For by HIM all things were made, visible and invisible. Can't wait to see what James Webb telescope will be revealing to us. Thank you, Sir
Alex Richardson
Alex Richardson Yıl önce
A very clear and informative lecture. Thank you so much.
Gary Goldstein
Gary Goldstein Yıl önce
This explains why the distance from an asteroid for example to the earth would be hard to track because of the time it took to reach the observed object and the actual time to intercept the excelleration of time of it's nearest approach to us here on earth would actually be a slight delay of possibly hours or minutes from it's new trajectory as it approaches us. Any smaller objects would be moving so fast and our field of observing them be seeing objects where they were and not where they are. The only way we can track an object (provided the image of it does not pass in front of our sun or a star) is to take pictures of a small area of space and then every so many minutes take additional images to track any movement from one image to the next to build up an image of it's movement and incoming trajectory in order to predict it's relitive position near our earth orbital path hours or minutes into the future, and any reactions the asteroid might encounter as it is influenced by the magnetic fields of other planets intersecting with earth's magnetic field (and the solar wind?).
Leo Aguilar
Leo Aguilar 11 aylar önce
The universe seems endless. It is an awesome thing to even try to imagine. It is an absolutely remarkable thing to attempt to understand. It is beyond our puney little minds to fathom. How awesome must be, the one who has made it!
Mary, Maria Pavic
Mary, Maria Pavic Yıl önce
This is the coolest stuff ever! I love this! You know what's so interesting? I was of just recent looking at the Void galaxies, or the Local Void, and I noticed that they have the type of configuration that the really deep space, those 'teenage' galaxies have. That is so cool! You can see them like dating each other, hahaha, it's so cute! And there appears to be a male and a female that bond together, or I mean, they look like they're dating. Then I saw one where they looked like there were four of them starting together and begin moving into a round shape, but I also saw about three of them just sort of packing together, and they were all rounded, haha, like a rubber or plasma head and then like a tube going out of that, and like balls of putty starting to move into a shape together, and there was just such a soft reflection of light on them. I wonder whether these beings have self illuminating the type we're looking for in our free energy, you know? Or like those fish have, which are in the deep ocean. Yea, this stuff is so fascinating.
Bill Stanley
Bill Stanley 4 yıl önce
Thank you Dr. Frank Summers for your introduction to the Deep Field discoveries provided by the Hubble Space Telescope, as well as your remarks anticipating how the James Webb Telescope will extend our knowledge of the very early formation of galaxies and our universe. As I marveled at how much we have learned, I was also struck by the joy you exuded in sharing these discoveries with us. To watch you, to sense your excitement as you shared your knowledge, was inspiring. With so much pessimism and strife occurring now in our country, it's nice to know we are still producing scientists who excite and motivate us all to look forward.
Frank Summers
Frank Summers 4 yıl önce
Thank you, and you're welcome.
Terry Minion
Terry Minion Yıl önce
Wow. So well done. Thank you! Brilliant.
Youka Naava
Youka Naava Yıl önce
Really highest quality explanation. How they know that age of universe so accurately? He could have explained that too.
dlkline27 7 aylar önce
During a short time of my government employment I had a small part in ensuring the quality of some electronic components that are in the Hubble telescope. This fantastic presentation makes me better appreciate the high level of quality requirements on that program. I sometimes wonder where all that "stuff" came from that appears in the images.
Ravi Sadana
Ravi Sadana 5 aylar önce
Clouds formed! Clouds of what? Where did they come from? Where did the heat of the universe come from? Then they use singularity as a failure of mathematics to explain features of the universe. Isn't this a typical example of someone brainwashed by "time", "money' and "mathematics"? And I'm just a lay person, but I do have common sense!
Harm Vandorp
Harm Vandorp Yıl önce
An estimate of a couple of years ago suggested there were 2 trillion galaxies in the observable Universe. But most of those were still in the early Universe when their light reached us and many would have merged by now.
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