Large Quasar Groups
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- Опубліковано 9 тра 2024
- Quasars are the brightest phenomenon in the entire universe, able to outshine any type of star, and even entire galaxies containing hundreds of billions of them. Quasars are the product of monster black holes at the centres of large galaxies, and so when we find multi-billion light year clusters of quasars dotted around the early universe, we are forced to reconsider some of our fundamental assumptions of cosmology.
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Do you use these videos to sleep or for night time watching? Check out the new sleeping space playlist, a collection of my most chilled out and ambient videos.
• Sleeping Space Playlist
Want to learn more about super-sized cosmic structures like Large Quasar Groups? Check out my new Super Structures playlist!
• Super Structures
Thumbnail made by Wimptastic: / wimptastical
MUSIC:
- Cylinder One - Chris Zabriskie
- Descent - The Tower of Light
- Dreaming Blue - Sextile
- Turn - The Tower of Light
- There Are Many Different Kinds of Love - Chris Zabriskie
- Retro Dreamscape - Twin Musicom
- Flecks of Light - The Tower of Light
- Clouded - Public Memory
- Trickling Up - Godmode
Songs by Chris Zabriskie are licensed under Creative Commons (links below), all other songs are from the UA-cam Audio Library.
- chriszabriskie.com/vendaface/
- chriszabriskie.com/cylinders/
FOOTAGE:
The space scenes in this video were captured using SpaceEngine Pro, a virtual universe simulator:
spaceengine.org/
Get SpaceEngine on Steam: store.steampowered.com/app/31...
Stock footage provided by Videezy.com
- ESO Quasar Simulation Footage and Sound: www.eso.org/public/videos/eso...
- NASA Redshift Animations: • Unraveling the Mysteri...
- ESO Type 1a supernova • Artist’s impression of...
- Redshift Expansion [Creative Commons]: • The Expanding Universe...
- Bright Halos around Quasars: By ESO/Borisova et al. - www.eso.org/public/images/eso1..., CC BY 4.0, commons.wikimedia.org/w/index...
SOURCES OF INFORMATION:
- Active Galaxies: www.astronomynotes.com/galaxy...
- Ohio State University Astronomy Lecture 162, Quasars, by Professor Barbara Ryden: www.astronomy.ohio-state.edu/~...
- Hubble Surveying Quasars: hubblesite.org/contents/news-...
- The Cosmological Principle
- Large Quasar Groups by Roger Clowes: articles.adsabs.harvard.edu/pd...
- Yadav's Homogeneity Scale: academic.oup.com/mnras/articl...)
- The Clowes-Campusano LQG: arxiv.org/pdf/1108.6221.pdf
- U1.11: arxiv.org/abs/1108.6221
- The Huge LQG: arxiv.org/pdf/1211.6256.pdf
- Seeing Patterns in Noise by Sheshadri Nadathur: arxiv.org/pdf/1306.1700.pdf
- More work by Roger Clowes (discoverer of the three LQGs): scholar.google.co.uk/citation...
TIMESTAMPS
0:00 Introduction
2:00 What is a Quasar?
9:46 The Peak Quasar Epoch
11:50 The Search for Quasars
20:39 Large Quasar Groups
22:15 Cosmic Structures & the Cosmological Principle
24:35 The Largest LQGs
27:34 Seeing Patterns In Noise - Наука та технологія
![The Dark Energy Mystery [4K]](http://i.ytimg.com/vi/cQyoYzHxdvo/mqdefault.jpg)
![The Dark Energy Mystery [4K]](/img/tr.png)
I really love how instead of just telling us what a quasar is, you took us through the decades of research it took scientists to figure out what was actually happening. Cheers for a fascinating video!
Great viewpoint!!
Really great demonstration of the PROCESS of science!
Wouldn't be much of a video otherwise seeing as how I was reading what a Quasar was on Wikipedia in 2007
@@realityvanguard2052 that's why SEA deserves props. There's a lot of popular science channels that only describe what we know something to be after we've already "figured it out", not explain the process that brought us to that understanding. The history of the research and how our ideas change along the way is just as interesting!
@@leminjapan We live in a golden age of informative videos, my friend.
Once upon a time, used to just rely on PBS docs for basic info, NOVA science now every Monday night, and just hope it takes you on a journey to the stars...
Then when most of the space documentaries became available online in the early 2010's I'd be watching them like every day, only to have to listen to the same basic concepts re-explained over-and-over again in the hopes that maybe I'd learn something new.
.. Do you know how many times I've had to hear about how many Earth's can fit inside Jupiter? OR that the sun holds 99% of the solar system's mass? haha or the basics of relativity and space time? Seeing that 2D representation of how gravity works using a trampoline or something xD IT'S NOT EVEN A GOOD REPRESENTATION! Not really... haha but I digress.
Point is this had better be a step above those dark times xP or I would be back on Wikipedia.. He does a decent job reading it for me
I remember when i spotted my first qusar with my telescope. The quasar’s name is 3C 351 and it is about 4.6 billion light years away. It took me about 45 minutes of looking through my scope and then reviewing my charts to make sure i am actually looking at a quasar. In my scope it looked like just another dim star, but it blew me away to think that i was looking at a mind bogglingly massive, bright, and powerful quasar that is 10% across the entire observable universe. It was incredible.
That's utterly incredible. Some real top-notch amateur astronomy right there, well done, my friend!!! I have the exact same experience, except all we're talking about for me are my first observations of both Uranus and Ceres hahahaha. I'll work my way up to your level some day I'm sure 😉
Every SEA video lately is like a full-on high quality documentary. Netflix should pick you up or something.
He's not black so not a chance
@@prospectorpete3738 do we know that tho? i dont think he ever showed himself but i might be wrong
The hell with netflix!
@@FynnOnTrack he is white.
@@prospectorpete3738 check your casual racism m8
Man, what great content. Every video is like a little cosmic audiobook.
Faaacts man
Another good channel is fall of civilisation with an equally english accent
Yup. SEA's videos are an instant watch.
This! His videos are like a book, they're both relaxing and interesting
They are fantastic to fill your mind with wonders and beauty of the universe just before falling to sleep. :)
More mindblowing than Quasars is how you can come up with this incredible quality in every Video. It is so on point that it truly outshines 99,9% of all space documentary’s. Hats off to you. Keep up the amazing work
He's using space engine. Go download it, it's amazing
@@Andromedon777 I don't know what I'm waiting for. I should get it right away, though I haven't bought it yet lol.
Think I'll do when I get home. It looks REALLY fascinating!
@@powerdude_dk try the free version first and join the discord group
Glad I found this gem of a channel awhile back. The quality of this content always has me waiting for the next upload.
Same.... its my lullaby, puts me to sleep in minutes
Same here. I always listen to his voice before going to sleep.
i get excited when i get a discord notification where he announces he’s posted a new video
@@drasiella Same. His ultimate space playlist is my favourite sleep companion.
@@GreggyAck Same for sure.
You’re doing something that the education system today is failing at. And that’s making these very interesting topics sound interesting. Thanks for all the educational and very fascinating videos!
Where do you go to school at?
I think the issue is that space is just way more interesting than other subjects to a layman. Coming from a chem major
@BlaixenU very sus
z*
Well none of this should be required to graduate anyway so why would it be in school? They need to teach realistic things like credit and taxes etc. lol just a thought
Quasar Tsunami sounds like a teenage rock band that would perform at my local bowling alley.
@Blood Beryl not dumb, you just lack the humor required to get it
Symptoms of expansion?🦉
I liked their Blazing Beam album
Can everyone agree that SEA is the best UA-cam channel talking about space in so many different and interesting ways?
So happy I found this channel
We should all help him out by buying his merch so that he can have enough time to make more videos for us to enjoy
He's very much on the calm side. I like to balance it up by watching Kyle Hill. I also like Joe Scott.
You're not wrong. Can't think of any channels with finer production. I recommend PBS Space Time for deeper and more regular content.
PBS Space Time is a favorite of mine, also recently discovered Kyle Hill. Them plus SEA are my top 3 for sure... wouldn’t mind any more recommendations though.
This channel and Issac Arthur are my favs. Issac talks more about futuristic and alien subjects but they're similar. They should do a team up on a few vids actually.
Thanks SEA for making my evenings nice and chill with your dulcet tones
H B’o👊😃😅🤏🏿😀😛🌺😄 CB NBC bin o
Hey k
No
100th like
I'm 17 and your videos have been a huge part of feeding my love of all things science and space, so I want to thank you for the amazing content. Thanks to people like you, I feel confident following my passions as I further my education and pursue a career. Thank you!
I’m so glad to see younger people enjoying and consuming this kind of content over the lightning feed 15-30 seconds attention span destroying crap that’s become so viral now
@@hadet yes I definitely agree. My prediction is that as my generation gets older we're going to have to face certain questions about what I like to call "digital hygene" aka things like protecting your attention span, hearing, and blue light consumption
@@gwynethlowry5996 - Never ever feel fear or hesitation when wanting to follow your passion! You're young, you're in your prime years to become what ever you want, nobody can stop you only yourself. If you truly want a career based around science/space then please absolutely go for it! It's young people like you who grow up (not saying you're not already grown up, to me at 17 you're and adult and deserve to be treated as one) but grow up to become the pioneers of the next generation of science. This may sound far fetched and a little bit whacky but what if you do (and you should) persue your passion and you end up discovering/creating/inventing something that's life changing for people or even humanity!?
Don't ever give up on your passion, find a job that is your passion and you'll never work a day in your life. Believe me, I grew up as labourer during my early teens, I then became a roofer on great money but hated it, now I'm a Strength coach and work in gyms and I've not worked a day since I became a coach because in my eyes, getting paid for my passion isn't work.
I wish you nothing but success, happiness and a career doing something that's truly what your heart wants, good luck and go far!
@@DDB-91 Thanks that was really nice to hear!
Stay in school
This is what really puts me to sleep at night! Nothing better then listening to the wonders of the universe as you slowly fade into the sleeping phase👍☺️
I can relate. This and Bob Ross, haha.
Yes! I do the same and recommend Isaac Arthur for interesting topics and sweet dreams :)
FK sweden
Check the first life on earth video, he showed himself there
@@prospectorpete3738 Sorry you feel that way...
'Yes it's really called the Huge Large Quasar Group.'
Welcome to letting astronomers name anything.
-What part of the sky did we find it in?
-Can I name it after myself?
-How big is it?
So true
XQJ1999-2209UP3
@@oliversasur5409 Yeah it’s either normal words or a string of letters and numbers lmao
@@kevinflaherty1 the letters usually represent what type of object it is and the numbers are just straight coordinates sometimes with extras like which telescope found it or the cluster its located in. I more referring to giving stuff a 'proper' name though. Observatories/telescopes work the same way (ELT literally stands for Extra Large Telescope)
@@insanospaz wait so when it begins in “HD” is that hubble?
I read every astronomy book I could get my hands on as a kid. I always thought quasars and black holes were separate. Imagine my astonishment and duh moment when I found out quasars are black holes. The thing from which light cannot escape is ironically the brightest thing in the known universe.
Same, I remember them as being described as whiteholes, or the exit ends of a blackhole. We know alot more than we did in the 80s
You'll always get multiple views out of me cus I love sticking your videos on cus they help me sleep.
That's a common thing for many people including me, but one thing I must say is it helps sleep not because it's boring, It's quite the opposite, but it gives peace of mind and a feeling of welfare. Also if I fall asleep on say minute 20, I will be happy the following day cos I'll still have the 5 min catch-up plus the remaining 10 or 15 minutes to enjoy!
@@ignitione I'm the exact same way. SEA's narration is just soothing
@@ignitione please make more 40 mins video's so the video don't end before I fall asleep 😂😂
I'm doing it right now.
In my bed, a bit high and rewashing videos.
And after 3-4 of them I'll sleep like a baby...
@@pantherofcarantania these videos hit different when you're high😂
I'm 30 years old right now watching this. I've always been interested in space. For some reason I keep thinking about sitting in my grade school library back in 1997 and doing mundane tasks while this kind of stuff is happening out in the universe. It makes me feel infinitesimally small. Like I could be reborn a billion times and never get any further than bearing witness to these Universal events. It's quite humbling.
i feel exactly this way. whenever i think about the vastness of space i almost quiver at the thought of being that small and insignificant compared to it. but i love that feeling
I don't feel insignificant, more like awestruck and eager to see what's out there for humanity to explore!
I was born in 1997.
Feelings do not matter. We are yet to go past the Moon. Billion light years? I am more concerned with Tofu and spices that work on Tofu
This is just top notch presentation. Your wording is incredibly well thought out and concise and the ordering of concepts is logical. Even more impressive is the coverage of recent papers that could only be distilled by someone very familiar with the subject matter. Your efforts are deeply appreciated.
God bless you thanks
Another day made better by your uploads. Endlessly thankful.
I love how I fall asleep every time I watch one of these, so I can watch it again next night. It takes me few nights to finally finish it. Interesting, but calming. Love it.
I'd just like say how much I enjoy your videos. I've watched similar UA-cam space documentaries and yours stand head and shoulders above the rest. No drama and calmly narrated, extremely well researched, factually precise, fascinating, and great graphics to accompany it all too. Your hard work has not gone unnoticed. This channel is up there as one of the best.
The Gamma Ray Burst Wall, Bootes Supervoid along with things like this are easily the most fascinating/horrifying things to think about in this universe. It's amazing to think about seeing things like this, is peering into the early universe. Sure there are some quasars within a billion light years, but they're quite rare after 'the age of quasars'. Who knows, in the FAR future we may have another.
SEA is easily my most anticipated space channel.
You went from a youngster trying to rap like many others, to a respectable science documentary creator. You have all our respect for this my man!
What do you mean
You have done something that no other person/show has ever done before: finally broke down red shift in a way I can finally understand it. THANK YOU! I have felt so dumb for so long but now I feel just a little but smarter. Thank you so much for that!
You go miss parsons! Proud of you! Never think of yourself as dumb! ❤️
I'm a physics-astronomy undergrad and your videos give me so much drive to keep on studying, thank you so much for the fascinating insights!
“Yes, it really is called the huge large quasar group”🤣🤣
Literally, every upload is like a birthday present to me. Love your content and narration. Please keep it up.
Your videos are awesome and this one is on a league of its own. It's so good that even if it's over 30 mins long, it feels short and you don't want it to end. You show a deep and rigurous knowledge and one learns not one but quite a few things with every video, and also you give credit to people who devoted their lives to investigation and astronomy and maybe didn't get much acknowledgment outside the astronomy guild. Very well done young man and keep it up. Top quality content to feed the mind with curiosity, imagination and the determination to understand.
We are just an *_atom in the universe_*
Even smaller than that, probably a quark, bc we don't know what's beyond the visible universe.
We ARE the universe. At a large enough scale you can think of it all as one ongoing process of which we are directly a (miniscule) part of
Yes we do....more universe
What are you talking about. I'm just answering the fuckin question to the video which choo choo asked
@@peace4myheart much much smaller than a quark... even to the observable universe
Imagine living on a planet where light comes less from your sun and more from the black hole in the center of your galaxy
You don't have to imagine. You can experience it in space engine yourself, which is what he's using to get the footage. UA-cam it
The Sun is humiliated enuf don't remind it.
Literal black hole sun. Soundgarden must have come from a quasar galaxy 😂
Ah yess quasar the bloodlust creator
Few will understand the comment
It's Ramadan right now and one of the things you do is wake up around 3 or 4 to eat breakfast and for the past, two to three years I have been watching your videos every Ramadan at 3 in the morning to get through my food before fasting, your videos are both educational and entertaining and its a treat to watch them every early morning while I eat :)
1. Go check out space engine because it's what he's using to capture this space footage
2. Come to know Jesus Christ, my friend. That religion can make you feel good on Earth but the *only* way to the Father is through His Son who died for us on the cross while we were still sinners.
@@Andromedon777 Shut the fuck up let a man celebrate his religion.
-A Jew
Extremely underrated channel
Spread the word.
Astronomy is the most exciting science, in my opinion.
Astronomy and microbiology for me! As above, so below.
especially when you are trying to sleep!
I'm a neuroscientist and even I agree with you!
Astronomy used to be the most exciting for me until u realize almost everything about it is untouchable and will never be able to be used in any tangible way. Still mysterious though but damn why does it have to be so big
@@henrycraig5952 That's exactly why it's so exciting. The fact that the universe is mysterious and colossal.
I always watch your videos when I’m going to sleep, and they always end up keeping me up because I’m sat here so encapsulated by the stories you’re telling, thank you for always making the best videos SEA, I’m glad someone else loves space and cosmology as much as I do.
Me too. Lol. Sometimes. 😅🗣🌌🪐🌞🌖😴😴
I like the pictures loo
SEA, you are a dream come true. Your genius work puts others to shame. Thank you for all that u do for us!!
"Something we shouldn't worry about in the Milky Way,"
Those sound suspiciously like famous last words to me. ;-)
One of the few channels for which I genuinely get excited over new videos.
Likewise, I get a little "yay" in my head when a new one appears
I'm a simple man. I see a SEA upload, I like it.
I'm a surprise person. I see a joke used a million times and I laugh out loud
You're the only youtuber I turn my ad blocker off for lol
This is my third night of attempting to finish this video in bed. I always fall asleep after 10 minutes. And I mean that in the best way possible. The production quality of your videos is amazing and incredibly relaxing.
Thank you providing us with so much interesting space content, it's difficult to find a channel as specific as yours and I'm truly grateful for the content you provide.
The best space channel! I look forward to each video and you can tell how much work he puts into each one and how much he loves the subject. 🌟 really amazing work
These are by far my favorite cosmology videos on UA-cam. They’re extremely well put together, incredibly informative, and are perfect to throw on a playlist and fall asleep. Thanks for making these!
I’ve always enjoyed SEA’s content and I like the narrators delivery. I’m at the most an amateur amateur astronomer. I understand just enough of all of this to know that I don’t understand most of it. But I’ll keep plugging away at it.
Same brother. But its fascinating non the less.
@@dmtmediabrothers
Do you know CGP-Grey?
Veritasium?
Tier-Zoo?
Legal Eagle?
Kozmo?
Sci Man Dan?!
Its ok to be smart?
Neil Red?
Thank you for making my night awesome
Love your content bro. I hope this message makes you smile like your content does for me
SEA’s videos are astronomical narcotics I can’t get enough!
Actually that is known medical science: Endorphins
This is by far the best astronomy content I have come across. I have heard I’d quasars many time but never understood the accretion disc. Brilliantly explained.
First new video since I subscribed a couple of weeks ago. Excited! Love your content.
whenever I'm feeling like shit, a gentle reminder of how small we all are is helpful. There is no better place for that reminder than SEA
Ugh so true. It gives me hope when I look at SEA and other space-related videos. My problems, my anxieties and fears ultimately have just as much meaning as any other human on the planet.
This channel is incredible. Great and comprehensive info, no click-bait titles and not a single plead for likes or subs. The videos are practically animated white papers.
You are massively underrated on here. Honestly you deserve millions of subs!! Your better than 99% of documentaries 👌 Love your work brother
"What do we name this astral body?"
"Big fucking thing"
Also physicists:
"What do we name this new fundamental particle we discovered?"
"I know, how about that silly word from a poem that's a German curdled dairy product?"
"Quark? Perfect!"
Either that or they headbutt the keyboard
God i love this channel so much. it really deserves more attention
I'm glad I found it
Hey man, I’ve been watching your content for a few months now and wanna say thank you. Especially for this video. I was about 5 years old when i first watched something on Discovery channel related to cosmos, it was About quasars. I was fascinated by it and was waiting for you to do video on this topic. Appreciated ❤️❤️ keep up the good work
I’m glad you found what you like doing and made it with the intention to put out what you like very much and not only are you very very informative and very unique but very nice to have a video along side a morning waking up or wanting just a chill good time
Damn I love this channel!! This is peace and tranquility and knowledge all in the same place.
👍😂
It's amazing how much he's grown past his already great GD content that he started out creating.
Of the hundred channels I am subscribed to, your videos are the ones I am most excited to see pop up
Your content is world class good. You should be an official spokesperson for the whole cosmology community. Your tone, diction and choice of words are a joy to learn from and the imagery is mesmorising. Don’t ever stop making these videos.
Please never stop making videos - seriously
Where is my popcorn I need to learn science!
I stole it, what you gonna do?
@@JanC3381 I don't know I'm panicking now!
I made some, but it didn’t pop. Is science broken?
@@user-bo1bp1jz5i Maybe it di brake!
I love this channel. There's something philosophical and deep about the discussion of space here - it's unique stuff, not gimmicky, not too dumbed down and his voice is like a sage.
you have outdone yourself again...thank you for educating us!! 💫 quasars are so epic
Love your vids bro, please keep them coming! 😎
This channel is one of my favorite covid discoveries/rabbit holes. thank you
With this quality I'm actually surprised that you don't have at least a million subscribers, amazing video as always
Been here for awhile and just wanted to say thanks, your content is part of my day almost every day. Always looking forward to the next one friend, Salud!
Dude, your content is better produced than anything on History or PBS or any other platform. It’s amazing this is free! I’ve been a sub since your early days and your constantly improving! Cheers mate
Really well put together. On par with PBS Spacetime.
Keep it up!
I wish every class I had ever taken was like this. A huge amount of information, while at the same time easy enough for the non Astrophysicist to understand. This information really helps change one's perception of how important life and consciousness really is.
Another wonderous piece of art. Thank you SEA for bringing such brilliant content, I look forward to what's coming next.
Thank you for making these videos, they really help me fall asleep at night ❤️
@totte kotte yeah 😅, even like rewatching his videos about space, it never gets boring
@totte kotte if you're on Android, you can skip all the ads by fast-forwarding the video to the end and press rewatch
I love your content!! I can't believe you out this stuff up on UA-cam for free hahaha
The Big Questions of Astronomy never cease to amaze me. Just when I keep thinking that space can't get any more exotic, folks keep finding more! You, SEA, have a remarkable talent for easing us into these heady concepts, while not bogging us down too much.
By all means, do continue to post more essays like this.
One of the best channels out there! Love your content, man!
SEA easily deserves more than 1-2 million subscribers... At least. I've watched all of your videos, again and again. Love from India.
That was a really good video. I found astronomy and astrophysics quite interesting as a kid even though I knew next to nothing about it, I still know next to nothing now but it doesn't mean I can't try to learn something from these videos. Right?
This is one of the VERY few channels I think is highly professional and is a steal of content on here for free and who's videos not only I've seen all of but that I actually enjoy to re watch and really capture the essence of each topic and space in general.
Man your video's are the best!
Thanks for your hard work we can all see and enjoy it.
Thank you for your hard work.
My favourite part of this video is the existence of BOSS Great Wall. They be like "boss what do we call this great wall?"
BOSS
some poor star: "why do i hear boss music...."
Love your videos. The best space/cosmology content on youtube period. I hope you could do a video explaining string theory too, that would be dope
This guy totally rocks it. This and History of the Earth \ Universe are my go to channels. Keep it coming dude.
Bro well done!! You always have really high quality contents, keep it up !
What a lovely surprise. 😊 Thank you, as always, for your wonderfully written words, calming narration and brilliant delivery. Take care.
I love the journey in each video and how you touch on how our understanding of say, quasars, has evolved over time and where gaps still remain in our knowledge. @SEA nevers just says "this is a quaser, thank you for watching my Ted talk" and for that I am thankful.
Min 4:57 "take this deep photograph of space" is just mind-blowing awesome. The pace of this video and its music is just perfect, and I must have watched it at least a hundred times now
I really love watching all your videos. They're so informative and relaxing!
This is an excellent video, packed with fascinating information about the history, nature, and distribution of quasars through time, how it has been put together, and some of the controversies and questions that remain.
I have a question about the very distant quasars: to appear so bright across such a distance, do their jets have to be facing toward Earth? Surely a side or oblique view would be dimmer, especially if there is a deep torus. If they have to be facing to within a few degrees of line-of sight toward Earth, that implies that their number is much larger. If, on the other hand, they are that bright from most angles, then the emitting region is likely large (compared to the black hole, at least a few light weeks) and relatively exposed. What’s the consensus on this issue of the relation of quasar apparent brightness and orientation?
It’s always a good day when you upload :) easily one of my top 3 favourite channels! Keep up the awesome content !!
Wonderful content, thank you so much for taking the time to do these videos so very excellently!
Excellent video!
Always on point with the content mate, keep it going!
When SEA says "vast quantities".....it makes me really happy
This channel needs seriously more visibility, like why doesn't this have millions of views.
Not enough of us nerds around. Sadly, ignorance of science or science denialism seems to be more prevalent.
Love this video. It shows how the “Big Bang” theory limits are ability to realize the infinite.
There is only one thing wrong with evidence for SagA* being a former quasar, and that is the belts above and below the galactic center that appear to be the result of a quasar tsunami.
I love your videos. Just right at my level. Each one you've posted I've watched. Keep it up!
Why didn't I sub to this channel a long time ago? Some of the best astronomy/cosmology documentaries that have ever been made come from this channel. Top notch work.