Megatelescopes

[@Pile_of_carbon]

One of my colleagues have started using your vids as basis for some of his physics classes. He used the one about Dyson spheres and the kids (around 15-16 y/o) were like riveted to the screen.

[@CockatooDude]

Hopefully some of them can be inspired by this to become scientists and engineers.

[@kingbyrd.1512]

@@CockatooDude I defnitely was. Isaac is amazing

[@v.prestorpnrcrtlcrt2096]

arrrrrrrggggghhhhhh no god talk

[@haydentravis3348]

@@CockatooDude Imagine an entire generation capable of mechanical and electrical engineering, building their own power generation and storage.

[@CockatooDude]

@@haydentravis3348 I know right, the possibilities are incredible.

[@georgeniculescu]

I love the scale of the ideas presented! Everything is MEGA on this channel !

[@rojaws1183]

Arthur is not afraid of dreaming big.

[@rojaws1183]

Eric - But at least we have guys like Arthur to inspire us.

[@mastercraft117]

Isaac is MEGA too

[@glorymanheretosleep]

Mega, but it won't ever happen.

[@georgeniculescu]

the show is not about what will happen but about what is possible, mostly without exotic physics. it sets a background for dreams and ideas, and many of these ideas can have more immediate applications without their MEGA scale

[@6w817]

I actually like when you incorporate mathematical formulas in these videos. It makes it easier on understanding not only how it works, but why it works :)

[@zekefartin409]

Always excited to see another Isaac Arthur video pop up.

[@ihaveyoud9553]

Thanks again for uploading, Isaac.

[@mikedrop4421]

Arthur made his mega telescope episode now its time for Cody's lab to make a telescope with spinning mercury.

[@isaacarthurSFIA]

Now that would be fun.

[@dhoffman4994]

Admiral Holdo my beer aka Assume Room Temperature He has enough mercury.

[@mikedrop4421]

D Hoffman exactly. He's the only person I could think of that had the skills and the mercury required to even attempt such a thing.. Even on a small scale.

[@Ryukachoo]

That would be a very cool experiment, especially if he can put the mirror pool into a nitrogen filled chamber so the Mercury stays totally reflective

[@alyasgrey9370]

What would be interesting, and maybe a little more feasible, is to test the visible light reflectivity of various spun-up pure metal mirrors... or simply using metal deposited on an already convex surface that could handle that heat such as quartz glass... using a consistent emitter and a photodiode. It would be a difficult project in terms of working with liquid metals of varying viscosity but it could certainly be done with a variety of metals working to silver. I would love to do something like this but I don't have the materials and the building manager would probably be quite unhappy with me building a smelter.

[@tterby1]

Just wanted to say how much I appreciate your work on each episode. Side note I am astounded at how far the quality of the episodes has come since your first episodes. Thanks.

[@isaacarthurSFIA]

Thanks! and yeah, I think some of the older episodes are still okay to watch but most make me cringe a bit to re-watch nowadays, I try to find something to improve on them each time, keeps me from stagnating or phoning one in.

[@jonathanhensley6141]

Megastructures is an awesome series because everything is go bigger or go home. Visuals on this channel are incredible.

[@palfers1]

Nice work as usual Isaac. And a shout out for the solar gravitational telescope out past 550 AU.

[@heyimharlz]

the content of your vids has always been great, now the production is top notch too! I always have your playlist on shuffle in the background when im studying :)

[@half3613]

I just want to say thank you :) I tend to go in circles and I can get lost in myself. You articulate with confidence and its really relaxing to me . I trust what I'm being told and the content is mind expanding, and with the ease in breath my imagination feels free. I'd rather be lost here, where I know I'm learning. I can't say I comprehend everything, but my thoughts seem to be expanding. Like the more I know, the more I'll know. Much love, I've been telling everyone about your channel since I found it.

[@colonelgraff9198]

Hey I don't know if you're doing speech therapy, but your 'impediment' has improved greatly over the years and I only notice it if I listen carefully. Good job, and congrats on the progress on that!!!

[@isaacarthurSFIA]

Yeah I started early last Fall, it's more noticeable on scripts than when I do interviews as I can concentrate on it, though the former are typically a month behind, I think this one was recorded near the end of March. We've been doing 2-4 sessions a week but will probably switch to one refresher-improver session a week soon, where I can record an episode right after, always easiest to do it right when I've just finished. Has helped with a lot of speech too, slowing down, enunciating better, remembering to breathe :)

[@RobinPillage.]

Interesting to see these comments. I just recently thought I was losing my mind listening to it come and go in a video. Now I know. Keep up the good work... and I love the channel.

[@bertilhjelm7623]

I like your accent/dialect! Keep it!

[@ben3364]

Don’t get rid of your accent completely, man. All the world’s greatest voices are highly recognizable.

[@JonnyAuto]

Ironically, I just watched his newer video and the impediment is much less noticeable in this video. (September vs May)

[@koensayr84]

Your optimistic view of the future is what keeps my head above water ❤️💫

[@theCodyReeder]

O dang! Im watching this late because I thought it was Wednesday! and of course KZbin didn't notify me...

[@MoTeC_MasonX]

Cody'sLab hey Cody I like your videos

[@MoTeC_MasonX]

I've been subscribed for over 2 years 😊

[@isaacarthurSFIA]

YT does seem increasingly bad about sending out notifications

[@mikedrop4421]

Alright Cody, I think you need to make a reflecting telescope with a spun mercury parabolic mirror.!

[@grassyclimer6853]

im not subbed to phillip defranco and youtube tells me when he uploads a video.I am subbed to your channel and to this one and I never get notified about your videos.

[@barefootalien]

Nice! You got a mention on PBS Space Time for Civilizations At the End of Time!

[@EddyA1337]

Man you would be so good at making documentaries. At the end of each episode I'm always like, "no I want it to be longer!! I wanna know more!". Thanks Isaac, I've said it before and I'll say it again; this is an awesome channel.

[@nerdanderthalidontlikegoog7194]

i tried to make a large newtonian telescope using a aluminized mylar mirror. The primary shape being formed with a adjustable vacuum in the primary's mirror cell. The depth of draw on the mylar would increase the degree of the concave shape. This wouldn't be an adaptive optic in the traditional sense but would allow a simplified method to get the ideal shape for the chosen focal length.

[@isaacarthurSFIA]

Interesting approach, any luck or did it not work out well in the end?

[@ozdergekko]

Sounds good. Why didn't it work out? ("I TRIED")

[@migkillerphantom]

Wouldn't a pressure differential across an elastic membrane produce a spherical shape, not a parabolic one?

[@geoffcunningham6823]

Only if perfectly elastic. Mylar isn't and it started out as a plane (probably). If the boundary was a fixed circle, with a pressure difference, you'd expect a paraboloid in the small-deformation limit.

[@Awave3]

If it produces a shape other than a parabola then you need to come up with some way to correct for the difference.

[@KvaNTyTroiden]

No matter how long video is, getting drink and a snack is already a habit. :)

[@moosewillis7098]

Love the series and recommend it to everyone I know, including random people on the street. I know you like to go big, but please do something on the other end. I would love to understand more about how Quarks and Glouns work. Thanks and keep up the good work.

[@matthewgardner5364]

Dam man perfect timing got a 100 on my math quiz and now it’s time to celebrate

[@rayndown1979]

Eyes of God 2.0 great idea!!!!

[@badt8man55]

Eyes of God 2.0 nice

[@mayankraj2294]

@@rayndown1979 ....????

[@r3n_Nakamura]

Matt you not human man... Even though I'm replying after 2 years.

[@RaVNeFLoK]

No idea what that scale means. Is that a 100% correct answers? In any event congratulations even though it’s a couple of years ago :)

[@levigriffin5553]

Good morning, KZbin. It's Arthursday!

[@AlaskanBallistics]

We need to build a telescope on the backside of the moon

[@paulwalsh2344]

Yes. I know I read a decade or more ago that because of the relative stability of the Moons crust, that actual optical interferometry would be possible utilizing remote operated optical telescopes deployed in crater basins or thousands of km apart even. And likewise a radio telescope either on the Moon's surface or in lunar stationary orbit opposite the Earth because the Moon acts as a perfect obstruction of radio signals from Earth.

[@theutopianoutopioan464]

Alaskan Ballistics, There's really a lot we could do if we spent more time and resources on space exploration and colonization, instead of spending the endless time and money trying to kill ourselves with wars

[@stefanr8232]

You have to make the case that the moon is better than the sun-earth Lagrange point 2. A Telescope in a Lunar crater will be out for 14 days. A lens orbiting at L2 can be aimed at any interesting part of the sky. Once we have a lunar economy up and running we could build many cheap telescopes. A lunar mining operation could also supply the L2 telescope fleet. Telescopes at L4 and L5 could use interferometry.

[@TheMetahedron]

I'm tired of all the "Mars Mission" talk. First, set up a base on the Moon without using a Saturn V. We could even set up a SPORTS ARENA up there to fund the Space Program forever....$$$$$ Next, how about terra~forming Africa, Australia or The Middle~East before you start talking crazy~talk...

[@frankglover4206]

No, that's just the stuff that gets the most attention. Grand things like this, have no drama...

[@ccody-long6915]

Awesome Video. Truly quality content you're producing on this channel!

[@hupekyser]

Hi Isaac, Im really enjoying the history, science, and background info that sets the picture for the future. I personally find it more engaging and educational, whilst still having the fantastic futurism element, Really love this approach. and it reminds me of some of the more sciencey vids you did in the past.

[@paulwalsh2344]

Ooooh ! Absolutely LOVING the intro music !

[@paulwalsh2344]

@ Luca De Rosa The extro music is likewise superb. All around, this was a fantastic episode music wise !

[@saralee5880]

I'm thinking advanced civilization's would use some sort of worm hole to pear into far away galaxy's or even an individual, hell one could even be looking at you right now from another galaxy and you would never know it.

[@edthoreum7625]

david smith, explain "advance civilization" & where they could be found in this 97% empty dark space?

[@user-ol2mr4bx7c]

ive just discovered your channel yesterday and i love you

[@exoplanets]

great video, cant wait for the giant magellan telescope!

[@insomniac30121]

the video is 30 minutes long he just posted it 19 minutes ago, and you said great video 10 minutes ago. Which means..... you still dont know if its a great video

[@paulwalsh2344]

Maybe he is so astute and smart that he watches the video at 1.5 or 2x speed ? I do that sometimes for less science intensive videos that I don't have to concentrate on.

[@MichaelOZimmermannJCDECS]

The Exoplanets Channel ... and what about the EELT? ;-)

[@MichaelOZimmermannJCDECS]

The Exoplanets Channel ...yeah, yeah, simple math! haha

[@ferblancart8669]

When I think about all the people who every Thursday tune this series I think "Isaac and the Arthurnauts"

[@mitchmontee8668]

Yes! New episode this week is now okay. Thanks Issac.

[@therealspeedwagon1451]

Such an awesome concept! If we can already see so much with an ultra powerful and precise telescope the size of a school bus then imagine what we could see with a telescope the size of an entire solar system! Really begs the question if a far off alien civilization 250 million light years away could see Pangea on Earth.

[@alexandrearrive6199]

Ow, Stellardrone music! Parfait for talking about billions and billions of stars and planets!

[@nastyaromanova5902]

thanks for the reminder... I've listened too long to stellardrones music without paying him, now I bought all of his albums. what a great artist!

[@alexandrearrive6199]

I literally sleep to Light Years, that music is soooo smooth. Love it all!

[@FirstRisingSouI]

Yay, LIGO mention! That's my area of research. Very good and correct explanation for how it works.

[@chromabotia]

A superb history and roundup of observational astronomy! Here's a whimsical idea, just go to +/- 50 AU from our own sun and use the sun's gravity as a telescope.

[@ozdergekko]

The next 5 sound particularly interesting, even for those (hopefully many) like me who have been watching *all* of your videos.

[@RogerM88]

Space Telescopes brought so many breakthrough scientific discoveries, that NASA should focus their budget in building more of them. As starting to build the LUVOIR Space Telescope, and a big Radio Telescope on the far side of the Moon. All working together with other telescopes as the Hubble and JWST, to find other habitable planets.

[@lachlanoneil8938]

Love your videos very in depth and still easy to understand.

[@paulwalsh2344]

... well pretty easy to understand. lol

[@DrunkenUFOPilot]

Especially enjoyable for me, with the extra radio telescope visuals, since I worked at NRAO some years ago. I love radio astronomy. It's almost a form of magic, to find out so much about regular stars, millisecond pulsars, accretion disks, planets, gas clouds, the interstellar medium, and even the intergalactic medium, with just a set of bent-up pieces of metal, some semiconductors, and computing power. And Barry Clark, one of the original instigators of the VLA and a real-life grand old man of science, knows how to put on a great Thanksgiving Day dinner.

[@km5405]

the biggest radio telescope in the world is the giant networked array in europe. we had a tour of ASTRON where they developped a big part of it and the supercomputer running it is in my college city. The array is spread across most of europe which gives it some serious resolution - and countries like latvia are looking to join which would up it even more. Very cool and interesting stuff.

[@brookestephen]

Isaac - I'm sorry but the spinning "zenith" telescope just needs a flat mirror to guide light to the aperture. How did YOU not notice that?

[@paxdriver]

As a highschool educated avid viewer, more math is better! It's so much more interesting than seeing pages of equations when you're looking at formulae and tables as you apply them to scale and concepts. Love the show, thank you much, more math! Lol

[@Tacticslion]

I just wanted to second this. I absolutely *love* the fact that you go into the science and math, and whenever you do, it helps re-educate me (both with things I've forgotten), and educate my young ones who watch this *with* me! And even when it's over their heads, they get *exposed* to it, so, later on, the concepts will be familiar and common-place, not some alien terror in need of avoidance. So thank you for what you do, and I love it!

[@Kaaotikone]

Great quality. Great information. Keep it up

[@cannonfodder4376]

I wondering how the ESA will get such a large system up into orbit, but I am sure they have it figured out. A most informative episode as always. :D

[@Vulcano7965]

They'll put it into the L1 I think. sci.esa.int/lisa/ sci.esa.int/lisa-pathfinder/31436-overview/

[@123Widowmaker]

happy arthursday everyone! and thank you again, isaac, for this wonderful channel.

[@theutopianoutopioan464]

Issac Arthur, you're ultra AWESOME!

[@gem3020]

I've been looking forward to this one for a while now! As always thank you for your hard work and amazing content! Best channel on youtube!! :D

[@bshinn4884]

An Oneill cylinder where the entire center is one giant telescope. One way to keep an eye on your destination lol

[@krinniv7898]

omg Isaac spotting @3:07

[@SixTough]

Enhance, enhance, enhance!

[@Arrynek01]

The LIGO explanation was on point! It is so simple, yet so advanced...

[@billmalcolm4291]

It straight up blows my fucking mind that you can do a high quality, 30-minute deep dive video each week, while I can barely get one load of laundry washed and folded in the same time frame. Bravo, sir.

[@isaacarthurSFIA]

Thanks Bill!

[@CarFreeSegnitz]

A telescope that uses the sun as a lense has been proposed. At roughly 500 AU a sensor can be directed toward the sun. The gravitational lensing around the sun simulates an objective lense more than 1 million km in diameter. To be a usefull scheme we'll need a cloud of these detectors as any one detector is unsteerable in a practical sense.

[@Roxor128]

Could be a way of getting colonisation of the Oort Cloud started. Build the sensors for the telescope out there and attach rotating habitats to them. The initial colonists would be scientists running the telescope, but they'd be followed by other people with other motivations sooner or later.

[@Roxor128]

AM radio has wavelengths of hundreds of metres, not tens. AM broadcasts are around 1MHz, plus or minus a few hundred kHz. lambda=c/f =3e8/1e6 =3e2 =300m Shortwave radio is what has wavelengths in the tens of metres. Frequencies of that band range from 3 to 30 MHz, and wavelengths from 100 m down to 10 m.

[@RoweLit]

Awesome episode, Isaac! Thanks so much for such an accessible and entertaining foundation to an amazingly broad topic!

[@nitwittter]

Thank you so much for taking the time to make all these video's, they are truly amazing. I love them.

[@LucaDR8]

Hi everybody, music manager here! I hoped you liked today's music, in particular the newest addition: Stellardrone! As always, feedback is appreciated

[@paulwalsh2344]

Hey Luca I mentioned above that I absolutely loved the intro music and the extro music was likewise superb. Are either of those selections this Stellardrone! you mentioned ? All around, this was a fantastic episode music wise !

[@hupekyser]

Ive always liked Stelladrone, but the track you used Lombus, “Time Slip" (which I hadn't heard before) was by far the most atmospheric, the repeating arpeggios gave it a feeling of importance and focus without being distracting. Nice work. All choices were great, and you trod a great line between creating a soundscape without being distracting from the narration.

[@paulwalsh2344]

yes... what he said

[@LucaDR8]

Thanks! Time Slip has been a classic track on the channel from way before my arrival as music editor. I slip it into the videos every now and then as a tribute to the old times

[@hupekyser]

Interesting that i hadnt picked up on it before. thanks for the info. Nice to know Stelladrone is being featured, tons of great tracks from him to choose from.

[@GingerGingie]

That was you at Kent State? So cool! I went there at the same time! Architecture, though.. no star gazing for me. :( So cool to see you in this video! We don't live in Ohio any more, we're in Europe now. Great video, I'm a fan! :)

[@isaacarthurSFIA]

Ah the architecture school, had friends in that, I think it might have been the most stressful major on campus.

[@CarFreeSegnitz]

Synthetic aperture telescope composed of widely spaced telescopes is the way to go. ESA will be getting practice with precise spacecraft control with the LISA gravity detector, just the sort of control one needs to pull off an optical interferometer composed of independent space telescopes. When you aren't concerned with building a rigid superstructure you can place the independent space telescopes as far apart as your heart desires. Gravitational collapse won't ever be a concern as the mirrors will probably never need to get much more than a few km across and a few meters thick. An optical interferometer that's AUs in diameter should be able to read alien newspapers from hundreds of lightyears away.

[@donaldhobson8873]

There really aren't enough photons coming off to do that without some kind of telescope dyson swarm. A few square km of collecting area won't cut it.

[@stefanr8232]

Lenard Segnitz, Check my maths. Did I lose a zer0? : Lets try 100 parsecs instead of "hundreds of light years". In order to see 1 au objects you need 0.01 arcsecond resolution. To see 1 meter separation 6.7 x 10-14 arcsecond. 0.1 millimeter newsprint 6.7 x 10-18 arcsecond. The Hubble telescope has resolution 0.05 arc seconds and a 2.4 meter diameter lens. So we need 1.8 x 10^16m lens which is 120,000 astronomical units. An interferometer with 1 au diamter should have 12 meter pixel resolution. 12 meter resolution is incapable of seeing that most billboard are separate from a highway and completely incapable of reading what is on the billboard. A traffic jamb would have a slightly different fuzz color than an empty highway. You cannot see which side of the asphalt a newspaper is on and it could be shredded and scattered across the road. It could be white paper and a blob of ink splattered 10 meters away.

[@rhuiah]

Great episode. I love learning of all the clever tricks people have used over the centuries to overcome different limitations.

[@pauljs75]

Some of the biggest reflectors that could be put into space with current tech may possibly be made with metallized films or fabrics stretched over inflatable structures providing a trusswork of stressed members. (Might be more suitable for radio than optics though.) I wonder if there's any work being done on it?

[@claxvii177th6]

This episode is a very good LOOK into the SPECTRUM of telescopes. The SCOPE of this video is trunly ENLARGED by its depth. I might even dare saying beside it's FOCUS this video made my VIEW much WIDER than before. Telescopes truly gives us a SIGHT FOR SORE EYES

[@isaacarthurSFIA]

Nice :)

[@jynexe3056]

I actually live right next to LIGO. I went there Freshman year just before they confirmed gravity waves. My physics teacher was ecstatic because he knew that they had discovered the waves, even though they hadnt technically confirmed it. They kinda just subtly hinted at it... as subtle as scientists get with their lifes work being realized... The most fun part of the trip though was definitely when our bus driver went a bit too far out in the Hanford area and turned onto the wrong road. You see... the security there is pretty tight... you can imagine how a bunch of freshmen felt when soldiers armed with assault rifles stopped and boarded the bus. Not fun. On the bright side, we now have a fun story

[@Barnardrab]

We can see a planet 10 lightyears away at 1080p with a continent sized telescope!?!?!? That's it, let's dump our entire military budget into NASA, build an orbital ring, and start shipping the materials into orbit now!

[@AugustusBohn0]

de-funding our military and then building a big metal object that would loom over other countries might end poorly for us :p "really everyone, it's just to look at the stars, promise! what are you doing with those ICBMs?"

[@edthoreum7625]

good idea, yet iran, USA, PUTiN , israel & many countries need enemies in any form to keep a brilliant & very progressive military alive? Sad! But I think europe's lisa is out there doing observation already. Also lets also improve our telescope tech (nano focused) while placing them in jupiter's moons or its asteroids? The further away from sun light the better?

[@karialatalo2447]

This very video mentioned that the planned launch date for LISA is in 2034... kzbin.info/www/bejne/mZqodH-JeMyHgbsm56s

[@Vulcano7965]

Ed Thoreum As far as I know, LISA Pathfinder is "just" a tech demo, demonstrating the technological aspect very successfully (this far). It is just a single Satellite, so it can't detect any gravitional waves. It really saddens me, that we have to wait to the mid 30s :/

[@theutopianoutopioan464]

Barnard Rabenold, Let's get rid of most alphabet soup agencies like the IRS, DEA, FBI Department of Education, Department of Indian Affairs etc. Then we could afford really big and great things!

[@mikhailhemmings3789]

This is an often overlooked topic that I haven't been able to find discussions on. Thanks

[@DarqeDestroyer]

One of the things that blew my mind recently when I was thinking about giant telescopes and doing some back-of-envelope calculations, is that a mirror of about 1.1 km in diameter, focused down on to an area of about 1 meter square, if pointed at either of the main stars of Alpha Centauri, would produce approximately the same amount of flux on that square meter, as earth's surface receives from our own sun. A person situated on that focal point would then literally be able to get a star tan.

[@starshot5172]

These videos are incredible. I lack enough hours in my day to watch them all (:

[@84Supervisor]

14 people have their KZbin resolution set to 1p. Most underrated channel in the observable universe!

[@GeorgeKaslov]

That's stellardrone music in the background. I am so glad that he too is now providing music to the channel.

[@arijao92]

I recently tumbled upon this channel and now I'm binge watching your content, truly awe inspiring and mindblowing stuff, definetly subscribing right now

[@jmautobot]

One of the best videos for a while. I like how this talks about a subject that is closer to my heart. Great video!

[@egooidios5061]

Dude, you certainly make higher quality episodes and documentaries than Discovery channel, and almost better than National Geographic in some cases. Thanks!

[@superdupergrover9857]

thanks for the scope of your channel. this is the only channel that meets and, occasionally exceeds, the limits of my imagination. in fact, before i discovered this channel, i had let my imagination atrophy in the 'magnitude of scope' department. i greatly enjoy my, now fully muscled, imagination.

[@christianhoffman7407]

I am really glad that at the beginning you make it a point to show some respect for the earliest of astronomers. They had the capacity to understand, just not the luxury of having come after Galileo and others who knowledge and invention we can build upon.

[@islandletters]

It would be cool if, in a future episode, you could also talk about telescopes detecting particles, for instance neutrinos and maybe exotic stuff such as WIMPS.

[@dpsilver1]

beautiful intro, these are what i love most about your videos

[@jondepinet]

Isaac I love your video but I wanted to discuss one thing you missed. When you were talking about interferometry you unintentionally implied that it only happens with radio telescopes. I work at the Navy Precision Optical Interferometer. We have an optical telescope made up of up to 6 separate effectively 5cm mirrors with a maximum baseline of 436 meters. Our maximum resolution is 80 micro arc seconds.

[@brettrobinson9713]

always a treat on Thursday mornings! totally got chewed out by my boss and a client but then this comes on and it's all of a sudden not that bad of a day

[@Grymtydeify]

Brett Robinson you'd have to leave it staring at the same spot for a long time, and the planets are probably already gone by the time the light from them crossed the vast intergalactic void.

[@altareggo]

I love that these videos are like an oasis in the Eternal Desert of politics and social commentary that our culture is so fond of inhabiting. Even the comment sections are almost completely free of loaded words and concepts like "liberal", "Rupublican", Trumposphere, etc.

[@Blackholefourspam]

Would be great to see a dedicated episode on gravitational lens telescopes and maybe the functionally similar Terrascope!

[@anthonyhall7019]

One of your best videos ever!!! I couldn't wait for This video to come out and again my mind was blown!!!!!!!

[@nibblrrr7124]

Anthony Hall Not to be rude, just meant as advice: You kind of sound like a spambot? ^^ I wholeheartedly agree though. :D

[@anthonyhall7019]

I'm not a bot, im from dallas texas and im real, sorry that i dont say things in a way you like but im a real freaking person! This episode was better than i could've hoped for!

[@TBleader]

I like the end where you hit on the point that telescopes aren't just what we imagine in the normal sense. They are just tools that we use to detect matter in the basic sense, and we should push those bounds.

[@RipplzMusic]

That a cool pic of you, looks like it is capturing a genuine happy moment

[@isaacarthurSFIA]

:) It was, undergrad days helping my friend Greg do sunspots observations for his senior thesis, the next year as a grad there I got stuck running the place Friday Evenings for public shows, so there's no photos of then so I could keep my eyes adjusted to the dark. But it was a fun afternoon after we'd both gotten accepted to our next schools and all the pressure was off for the last semester.

[@RipplzMusic]

A true smile is always apparent in the eyes. Glad you got to experience those times and helped a friend. Not to mention the whole observing sunspots haha.... After walking at graduation I still had one more credit to fill. I think that smile was plastered on my face while I coasted through my last summer semester of 'college'.

[@yaphetbruce9321]

A new video from Isaac Arthur? Yes please!

[@7lllll]

i expected at least some discussion about the long time it would take for the light to gather, and issues it would cause when a telescope spans light years across

[@isaacarthurSFIA]

I probably should have talked more about exposure times but we were running a bit long and a brief discussion of non-optical telescopes seemed a better fit.

[@jwadaow]

Isaac Arthur I thought this was a short video

[@jkj420]

I loved this episode! Thank you Arthur!

[@colin8696908]

23:03 This exists now.

[@sorcikator993]

The next few weeks are going to be interesting!

[@edthoreum7625]

yeah!

[@theostickle2604]

Thank you. I've been watching your videos for a little while now. Helped put some missing pieces of something thats been bothering me since I was 5 years old. I was one of those odd kids that built models, read dictionaries and science encyclopedias, and explained how stuff works to my friends.

[@RJL738]

This was really neat.

[@1784st]

I can't wait for june 14! I also would like to see outward bound colonizing Ceres!

[@edthoreum7625]

ceres? we will be there via space mission by 2030?

[@ShadowriverUB]

one correction, p at the end of resolution means progressive and its purly video term meaning all pixels are updated in frame, you can find 1080i which i means interlenced

[@paulwalsh2344]

Technically correct, which is the best kind of correct. I worked in the video industry and noticed that too, but just assumed that it was just an attempt to easily communicate the number and size of pixels to an ... "uninformed" portion of the audience. But I applaud your punctilious interjection, and in the spirit of that, I just have to correct you by saying that the i at the end of 1080i stands for interLACEd not interlenced.

[@ahabkapitany]

Nice job, Isaac. Excellent content, as usual!

[@jamesfra1311]

Planetary siege? Can't wait for next week!

[@PiterburgCowboy]

Orth, univorse, whatever. You have the greatest space science related youtube channel, and I can't understand that people need subtitles. And english isn't even my first language.

[@goneutt]

"four kilometer vacuum tubes" sounds like something for your megastructures series

[@A-Milkdromeda-Laniakea-Hominid]

I will never feel comfortable outdoors again, knowing a K2 scientist somewhere in a neighboring system could be watching! I never knew that "reading a newspaper headline from space" could be scaled so much 🤯

[@bigbadting]

i have been waiting for this

[@manjsher3094]

Anyone else, when a new video comes out from Isaac Arthur say in the back of their minds " Sir Isaac Arthur" or is it just me... Idk.

[@paulwalsh2344]

It's got a good ring to it.

[@hupekyser]

The dude is off the scale. I really dont know how he does it. He needs some formal recognition for sure.

[@LMAccount1]

Very... insightful ;)

[@freesaxon6835]

Chromatic aberration, & ligo explained very to the point, and therefore easier to understand

[@Unboundkhaos]

Man.. If you were to make hour longs videos... I definitely wouldn't complain lol. Your videos are amazing.