StarTalk Podcast: Cosmic Queries – The Deep Part II

hey YouTube averse another episode of star talk now this star talk Neil deGrasse Tyson your personal astrophysicist reporting to you live from my office in planetarium Chuck nice that's right sir with that we've got our cosmic star lock there you go star talk and then cosmic queries and so what's today's topic well you know we did cosmic queries the deep you know we went deep on some em on some some issues like you know we got a little more in depth than we normally do it was multiple topics we just got deeply just got deep and now we're going the deep part to us there were so many questions deep the sequel to oh look at that this time it's personal yeah you know the movie the deep I think had an astrophysicist in it okay wait now and it was directed by by Ed Harris the do yes that is Eddie Harris and so there were creatures from outer space yeah but yet they reside in the ocean the ocean right yeah not bad and it was love of course at the end that redeemed us as as a species and caused them to say you know what we're not gonna destroy you you know all right cool yeah well this is of course all I'm just so not gonna be like that no no by the way probably they'd be like you do realize love is nothing but a biological function let you guys experience in your brains and we have no idea what it really is and yep your food your food to us go alright we always start with the patreon and I don't always know the answers no you don't know you don't know questions so you know yeah I don't know how would you know if you would know the answers but you do always have an answer you may not know the answer but you have an answer that's for sure you think I don't know if there was a compliment or an insult I think that's right neither that was just know you you normally do have the answer which I find fascinating you know to be honest on whatever what else would I be John Lear goal of cosmic queries is not to try to stop you that's not the point no it's people ask questions you got questions and I have my the answer this is John Donohue and he says how is there anything at all which came first space or the big bang chicken and egg with the universe first of all the chicken and egg has been solved so stop mentioning chicken and egg real yeah it came first alright thanks for that ok we done there where the egg come from from a bird there was not a chicken oh snap ok that is just crazy how's that that's just evolution by nettle so that's natural selection at some point the bird that lays the egg that you're calling a chicken is some other bird that you're not calling a chicken right now obviously is probably several generations took some time philosophically this is what's happening but it came first we're done there that we're done the egg first there you go alright so now I can tell you what our thinking is mm-hmm but there's not some measurement of this to verify it our thinking that makes that is that the Big Bang exploded into existence space matter matter and energy mm-hmm as well as the hour of time itself so time space and matter so to even ask what was around before the Big Bang hmm we'd be like asking what is north of the North Pole what is north the North Pole the question has no meaning there you go gotcha see just because you can put nouns and verbs in the right sequence doesn't mean we'll have axial meaning don't mean jack okay so let me get this straight yeah this singularity happens boom a second later everything else that is is inside of that yes so time and space and all the matter energy matter energy and matter which we're gonna call the same thing you know one who turns it to the other all of that is inside of this thing that now is in existence yes dude that's crazy what you just that's that's our current understanding dude that's amazing so that would mean that if space is nothing oh my head is hurting right now cuz I was trying to think about if you watch its base to be nothing yes where there's no then what would you you know how to how do you make the nothing because nothing is space you need a word to describe where there is no space oh my god that's crazy where there is no nothing it's right so now so so here's what I'm trying to really have a word from no you don't right now in fact let's call it something no we should we should call that nothing and we should call what we have something like it's something that's nothing yes ooh chucking Vincent where you go because thing cuz really nothing is what we're talking about that's really what we're talking about there's nothing now we want to talk about something that has nothing that should be something Oh Chuck nice Chuck [ __ ] for the OED tomorrow morning at the vote hello man so that so now what I'm trying to envision is what is around that singularity and the maybe a heart it's embedded in a higher dimension right it's like you're an ant crawling inside this sheet of paper and that's your world you have no concept of what's above or below and you know we do we do because we're higher because you can lift the paper up and see underneath I can see what's wrong and it's still on the piston inside a dead ant can never see underneath that page can't see it no no the N is in the paper right does some say no it's in the pin in the paper he can't see what's underneath the correct that's crazy that's dimension so that's it so basically what we're talking about this nothing is really only resident in a higher dimension at the time when the singularity no the higher dimension people might say it's embedded in this thing that they call something right even though if it's nothing to us yeah Wow that is great that was dude what's his name John John thank you for that John dawning John donohue all right nice that was excellent ah I second I'm second that was really good man alright alright let's move to the next one this is from Facebook this is a Chris these are patreon no this is Facebook that was patreon the first one first you let off with the picture I did because of course patreon patrons actually support us financially okay so you know that's cold that's like say unlike the rest of y'all no I'm just saying that they're special because they support us financially anyone who listens to the ads that fund this program are also supporting us if you're listening so the people I really have a problem with are the people who don't listen to the ads especially since you're the voice on a lot of the I pretty much edition Chuck thank you so listen to our ads or support us on patreon and skip the middleman and give us a direct infusion of cash I can't go by the Campbell Soup is that they buy the air knock on the door the door give mr. Kamath I doubt all right here we go this is Chris call Coghlan whoever it speaking of Campbell's soup yeah okay so okay for those of you who are not on video oh yeah this is our sake of this Wallace's convinced soup oh okay oh primordial this is primordial soup that's hilarious oh there's actually super there yeah yeah can a primordial soup open that up and start your own world not only that what can I get our could you go put one of those down what are you pulling down there you talk just pull the top one it's fine oh you got another can so now Campbell's soup Wow Yoda there's a Yoda soup and it's not baby Oda it's like growing up yours a grown up yeah yeah yeah yeah that's pretty cool yeah and once again mm-hmm it's my office we should do a thing on my office yes we should all right delicious I am alright here we go this is Chris Coghlan who wants to know this I'd love to hear your take of the multiverse theory do you believe that every choice ever made by everyone has resulted in other realities such as a crossroads example for options left right straight on and turn around the theory would have you make all four choices and only be aware of the one along a linear timeline which would be your linear timeline interesting so let's back that up yeah let's back that up let's back up citizens packed a lot of stuff here's where the multiverse concept comes from okay with when you take a nice general theory of relativity the modern theory of gravity correct gives us our understanding of the curvature of space and time all right that's how we get to our understanding the Big Bang and all this all the modern cosmology has that as its foundation right then you have quantum physics okay which came out interestingly ten years after the general relativity this is in the 1920s quantum physics is all about molecules and atoms and nuclei and particles okay those two theories do not play nicely with each other in the sandbox okay they each work in their own regimes but you try to bring them together they are inconsistent with each other well it's colliding very if it is yeah figuratively that right all right so now what happens at the beginning of the universe when the entire universe was the size of an atom whose rules are in charge whoa you have a shotgun wedding there you go between quantum physics and general relativity oh my god and all of us are pretty sure that quantum physics wins and in so doing quantum physics where it pops particles in and out of existence it could pop universes in and out of existence of all universes if the universe is the size of a particle solutely so the point is let's go back in time when the whole universe was the size of a particle what are the rules of quantum physics telling us they're telling us that multiple universes could be popping in and out of existence and we are just one of them each one with a slightly different law physics okay so let's start there so now there's no limit on how many of these universes there could be let's say there's infinite okay if there's an infinite that means there's every possible combination of all particles there ever were right including combinations of particles with you on another universe on a podcast where you have an evil mustache well you already have a my reality evil goatee okay here's the nice Chuck right please Dave and Chuck nice Chuck exactly other universe and he's still a virgin by the way so so they it's been hypothesized that every version of you exists virgin virgin nice Chuck every version every virgin so you only happen to be in the one version that you are in right I so here's what I would say that people like thinking about this as a means of immortality true however why would this Chuck with all your atoms in this way have any consciousness overlap with the Chuck in the other universe none there's no reason there's no reason for me to think so because that sucks living his own best luck with his own best life right you don't have overlapping consciousness with your twin no they're in the same damn universe as you and and and if they're identical they came from the exact same single-cell single-cell right so if you don't share consciousness right with your twin I'm not giving reason to think you would share consciousness with somebody else who has the same molecular DNA construct as you but in another year right so there you have it so yeah I mean that makes perfect sense yeah you know that makes perfect sense a nice question there one more I think before we break before we break okay here we go let's go with Claudio Ramirez Claudio Claudio coming on from Ramirez Ramirez from Instagram says this if all matter is spaghettified at the event horizon of a black hole into what is light spaghettified whoa smaller pieces photons or or is it that since the photon is actually energy it is zorp by the mass of the black hole so the light that goes into a black hole how is that spaghettified as a wave and a particle at the same time are you ready oh yeah can you hit but you can't handle the truth I don't know do you want the truth I do what the truth you can't handle the truth alright so first of all it's not the event horizon where the action is right the action is someplace closer to the center of the black hole where the tidal forces do rip you apart okay okay I imagine there could be some black holes where the tidal forces are strong enough at the event horizon for this to happen to you but if you're falling you will fall through the event horizon you won't know any difference okay before during or after all right there'll be a point before you reach the singularity where you were ripped to shreds gotcha okay spaghettified now how about light light is in a way spaghettified already it know in a way okay light also gets spaghettified okay also gets so let's take a wavelength of light huh let's call it blue light and it has the wavelength is big all right good actually it's a small but just okay let's be literal here's a wavelength of microwaves a couple of centimeters across okay okay you can see that wavelength all right as this falls into the black hole right okay if you're watching that fall into a black hole right it stretches the wavelength stretches yes Wow it becomes as we say redshifted but Shipley means becomes a bigger a bigger wavelength we said red because we talked about visible light shifting to the red side of that spectrum that's him but I'm using microwaves which is already redder than the red but we kept the term it's getting bigger and it would then become sort of infinitely red shifted as it goes down to the to the to the bottom of the horizon Wow yeah so it really does actually identify in some sense it the photon of longer wavelength than the size of the black hole itself into the black hole so there's a limit to how big is the how big is the wavelength it fits in got you okay the funny thing about the wavelength of these particles is you can trap them you could do interesting things with him by creating boundaries smaller than the wave right like your microwave oven which has little holes this is the size of the microwave right how big are the holes on your microwave door I'm just say small well yeah smaller right smaller than wave they oops more than wavelength irregular so yeah so it doesn't come out they better be it's why you don't fry eyeball your eyeball look at it right if they weren't these burritos yeah that's funny yeah that would be a badly designed microwave yeah so that's how you can have a transparent door Michael to light visible light but it's not transparent to microwaves sweet microwave reflect off because it's smaller so that's what'll happen in a black hole to light my next break okay when we come back more cosmic queries the deep down deep part 2 when we return you we're back Startalk cosmic queries the deep deep oh sure the deep the deep the deep nice have you as your much gone deeper to mine yet no you still go through puberty by saying I am going through adult puberty so I'm looking forward to it the deep the deep no you got that vibrato that scotch vibrato that's what it is gods don't drink scotch I love scotch you're what I drink wine why doesn't do that all right back to our questions we have the real JP from YouTube says this that means he's famous if he's the real somebody the real is right yeah how would you explain what weather was if we were in fact in a simulation so oh they would just be simulating the weather yeah no it'd be the same it's just a simulation of weather right correct and if they want to be convincing as simulators they would simulate everything that you would otherwise experience that date that they experienced in their world right so they would have particles that you know they wouldn't even have to be actual oxygen nitrogen until you make the measurement right right and then B quickly that's the flag goes up and this is light yeah that's what it is yeah program in there the oxygen nitrogen molecules and carbon dioxide unfortunately and so so they wouldn't have to have everything be that but you just program that in here's something about the air go ahead do you know the quote from was it Ogden Nash Ogden Nash said what because either I Ganesh or George Bernard Shaw okay I know they're very different writers it's not same wind is caused by trees waving their branches oh that's very I like that yeah in a beautiful it's a lovely lovely sentiment because of course we see trees reacting the manifesto exactly that's I'm sayin so perhaps that the manifestation when you turn on the light how do you know it just didn't suck all the dark out because I'm not five when I was in Middle School I had I converted my bathroom into a dark room a dark room where you develop yeah it had a little photography business is you I was in Middle School Jesus cran so this is we had an interior bathroom that didn't have a window so that wet I can make it completely dark so I had a little sign I put outside and it said don't open the door otherwise the dark will leak out that's funny I still have that sign - I had a sign that said don't open the door unless you want to be horrified well I'm a teenage boy damn it stuff is going on in here by the way um what I find really cool about what you just said is that is what we're doing we create simulations right now - tell us about the weather and what it's going to do Oh interesting that's exactly what we do yeah and we do that based on called climate mom exams and those models are made at the wood the reason they know they work is because they're made and tested on data that's already happened that's correct so it's so cool like you you know there you go yeah mm-hmm so all right nice all right all right you want evidence when we don't really know what's going on right when they say 50 percent chance of rain that is the best evidence when that models would not worry right does not work that's smoke okay we got nothing is really what they say so in the future you want weather forecasts to be a hundred percent of this or zero percent of that right then you know you've got the right model that's - because you're really just covering your ass see all you are freakin a oh my god yes a little weatherman no 30 time they give a statistic they cover their a 50% chance of rain that just means we don't know what's gonna happen oh my gosh yeah alright Sam champion we're coming for you all right okay all right here we go uh this is Wharram see do who I am Sidhu from YouTube says why is everything spiracle and curvy in the universe spiracle and curvy uh I wrote a whole essay on this show called on being round nah he's I think was one of my better top ten essays on the ground on being around and so I'm almost not even going to try to actually I that essay appears in in my death by black hole book no really produced there yes we and might I don't think I put it in my so it's out there okay so should I spend time on that here and now or should you just go by the book no did why I run black hole barroom if you do here's your answer death by black hole Amazon there's a whole chapter in there on being round on being on its I'll say in simple terms it's okay multiple laws of physics conspire to make things round when you might want them some other shape and that goes for SOPA bottles it go there's no cubic soap bubbles it goes for forming planets it goes for forming stars it goes for what else it goes for beads of water that ball up on your freshly waxed car after it rains absolutely it even goes for it even goes for vegetables things that have come out of the ground like carrots but will carrots there there Kirby no girl but we talk about spherical round things like anything that hangs like form of ice will be will be around anything the heads from a vine they're generally round okay so the laws of physics conspire to make this happen and that si is an entire exposition on that and you can just google to you are such a tease cuz not tell I think it's I think you can get the essay without having to buy the book just google my near the granite ice the grass just step takes out Mike Tyson in case he wrote anything that's right I'm just saying this so so Google deGrasse and on being round and that should go straight to it I have a book called on being on the ground huh it's where I bite your ear off and I knock yeah on being on the ground okay anyway alright there you go um but when I do an internet search Riley Tyson I have to do just about I subtract out chicken that's true and I subtract our boxing it tightens up the certain that tightens up the search alright so on being round and now to give you a more in-depth cuz we don't have time to go into it yeah it's it's a lot it's a lot there all right here we go Wesley uh uh yes Wesley Tseng wants to know this hey there my name is Wesley and I'm from Jersey since we are in the universe made conscious and the universe as we know it so far started at the Big Bang do you think it is possible that life was created by the Big Bang itself that shortly after the Big Bang happened the cosmos awakened thank you for all of the knowledge that you have given and that I have gleaned from Startalk Wow hmm that's a higher literate thing right there yes compositionally and everything exactly he went there somebody has grammerly somebody speech good everybody's be good just be good so I the answer is no right there you go no this one here's why right life is made of what we quote organic ingredients correct so our life is yes right okay so we've got oxygen nitrogen carbon these are organic molecule ament's okay organic chemistry is all about what those elements do plus when they attach something else to it my all life on Earth has those elements in it exactly those elements weren't around at the Big Bang oh they though they were manufactured in the cores of stars of a kind of star that happens to then re-release it out into space so you have to stockpile generations of these supernova explosions that have made these elements and enrich the galaxy you have to stockpile generations with them so that a later gas cloud doesn't only have the hydrogen and helium it was endowed with it the Big Bang it's got these extra contaminant enrichments and out of those enrichments the next generation of star systems will have the ingredients that can make planets and people that is really very life in general I wish that that was common knowledge that what you just said right there is so important in terms of an origin story yes it's so important origin it's our origin story the story of life yeah Wow hey man that's a great question that's why if you're looking at very very old stars in a galaxy uh-huh it's pointless to try to find planets with life on them we think right that makes sense yeah yeah it was like yeah it's it's kind of like looking at cookie dough and thinking that you're gonna one day just see a cookie no it's like that dough has to go home it's so hungry how did you know you weren't from the freaking Big Bang you know why I bet that's the best you can do for me it done so much for the galaxy it expands the galaxies received ah that no that's a really great point though that that's our origin story that's my task five billion years from now we're even more generations of stars have sent us could those star systems have so much organic material that they'd be teeming with life like an earth it has only one Genesis as far as we know maybe they're planets with multiple Genesis Genesis is life like they can't it like you just tripping over life there's so much so it's material there to make so much material to make life Wow dude that's god I wish everybody knew that okay alright time for one more question we got time for one more look for this segment okay okay okay okay all right here we go here we go here we go here we go here we go this is from keep looking up on Instagram mommy's gotta keep lookin up yeah that's their title right really keep looking up on Instagram oh my god what if backwards time travel is possible but it's only possible at the same pace as we move forwards and we will also be forgetting our memories as it moves so it's kind of a pointless in the end because you know you just be reversing the clock okay no one thinks that when they're thinking of time truck nobody nobody saying I want to go backwards in time and then just start living backwards what the Benjamin Button version of times round right if that's not really time travel no it is that's moving forwards time while your sorry ass is moving backwards basically what it is yeah yes Benjamin Button that's the Benjamin Button time-travel what a famous author wrote bedroom button who was I do not know f scott Fitzgerald that's pretty famous that's pretty famous yeah in fact he has one of the most brilliant sentences I've ever read in my life alrighty the sense I read that convinced me I will never be a novelist oh wow cuz I said I can't write that Ted all right like damn this guy just did it like okay it came can I tell you the sentence go ahead you ready go ahead okay it's from The Great Gatsby all right okay you remember it's a big party there's a lot of like you know sex drugs and rock'n'roll yeah okay Rowan 21 20s right oh yeah here it goes in his blue Gardens men and girls came and went like moths amid the champagne the whispers and the stars that's a great line I'm done I can't that is it is not possible for that sentence to come out of me it's an excellent that's that's really well done god that says so much so much so much that speaks volumes right like you can yeah for sure you can hear the convinced in there yes you can hear the licentiousness in there you can hear the the the it's at night and he doesn't have to tell you it's right exactly right yeah no that's it okay yeah if Scott Patrol yeah that's it Chuck we got to take break okay come back third segment all right be there star talk cosmic queries we're back Startalk cosmic queries yes the deep these are your deepest questions that otherwise defied category I think the right choice just kind of like yeah we don't care where they come from as long as they end it dot as long as they're deep thought all right I think the ones we've read so far are exactly really good yeah yeah yeah okay I've enjoyed it so far you know nice job people all right here we go let's uh let's do another patreon patron all right and this is Jenson smart okay what what an apropos name for this show Jensen Jensen Jensen that's a cool name too you know how do we know dark energy is not caused by black holes I hope Chuck is there on this one I don't know why he said that I love you cha that's nice yeah so there we go how do we know that's not comfortable enough in his masculinity to say that but I'll say that we love you chuck oh thanks I love you too this is weird [Laughter] go ahead so here's why all right black holes are made of ordinary matter and energy right and dark energy I think he's being a little swayed by the word dark mm-hmm it is some pressure in the vacuum of space forcing the universe to accelerate in its expansion and a black hole don't play that right black hole is the opposite of them right it wants to pull things in now let's ask maybe could that same question be put forth in reference to dark matter okay there's dark matter black holes right not likely in fact almost certainly not because we can account for the matter that is occupied by black holes okay as well as stars and planets and all the normal matter we're accustomed to that's made of the elements you find on a periodic table dark energy is made of none of that ooh it behaves completely differently right not gravitationally but it does not interact with light it does not the things that everything else does to light that dark energy does not Wow so we don't understand it interesting so dark energy is truly a mystery yes sorry yes sorry it's the longest unsolved problem in modern astrophysics through this since 1936 right yeah so so van it was originally called missing matter the missing matter problem interest you have this gravity but where's the matter right there's what would be what would be this gravitational effect basically what what's causing yes something's causing matter Wow so dark really is just unknown unknown and it I've made a case I think a strong case that dark matter should be renamed dark gravity yes that's what it actually is right we don't know what it's made of matter or anything mmm see now a few calls if you call it dark gravity now we've actually given it a thing and well we should call it black gravity okay because then they will find out the cops will be on top they will find out you can't had his black gravity this is choking on you we don't know what this black gravity is doing send a unit organ every which way yeah universe we got we don't get to the bottom of this black gravity I'm telling it right now all right here we go this is Jonas you got more questions Joe it Jonesy clipping Steen wants to know this how can sunlight which transfers heat Molecular Li spend eight full seconds in frozen space and still be warm why is moonlight not the same seeing a house it is a reflection of sunlight it's an interesting question you don't feel warm love the moon but you'd ever feel the warmth on the Sun 93 million miles away hmm interesting mmm well the moon is not very bright compared to the Sun that is so true so because we could look directly at the moon for as long as your eyes are not gonna burn hey okay hey nobody should shield your eyes at the full moon that is not happening that has never happened you can stare to moon down let me tell you how dim the full moon is okay okay did you see the Eclipse back in 2017 yes I do Merkers Eclipse mercy if you eclipse if you didn't see the total eclipse mm-hmm don't tell me you saw the Eclipse okay well then I didn't see the class okay I'm not like you who gets invited to sorry in Tennessee I was a secret place it was in Idaho Oh fine so so here's the thing worse there's why a partial eclipse is nothing like a total eclipse okay it's not just a slightly lesser version of the fault we ready go ahead when the Sun is 99% covered by the moon mm-hmm with it's just a thin little smidgen right the amount of light that reaches Earth from that smidgen that little smidgen equals the light of 10,000 full moons holy crap so that little sliver of light the circumference of the moon blocking out the Sun that a little bit is brighter than 10,000 full moon correct Wow all right so just put that in context damn that's that's all right so they on a Snapple cap okay so don't so don't cry about that one right do you understand yeah we're good we're good moon it plus the moon you're not reflective the moon is no so the moon okay is only reflecting not much more than 10% of this sunlight that hits it rest is getting absorbed right so the moon don't turn to the moon in in moon base they ain't ain't happen right okay so it's a B mm-hmm the photon that's you is a packet of energy and it doesn't make sense to think of it as having temperature it's just energy moving through space that's you okay interest then when you absorb it mm-hmm it vibrates the molecules in that which absorbed it and that is measured as temperature so the disruption of your molecular makeup is really what is the heat that you're experiencing when the energy you absorb increases the vibration radio molecules you experience that as heat that's it that's correct so that it's not deep it's not like a bunch of photons are laying on your body warming you warm no not warp you're absorbing them entirely this the disruption of your molecular disruption is oh by the way there are photons that you don't absorb that way really yes okay now what is that like ultraviolet photons oh my god it's really you absorb an ultraviolet photon you don't feel the heat right what it does is it breaks apart rather than making you vibrate more it breaks apart molecules right in your body which leads to skin cancer and now you may not use the word disruption because that's a disrupts that's it just forgot you see I was using disruption as just a disturbance but it's not know the disruption is ultraviolet you can break them all if you don't that's why we don't experience ultraviolet as heat we experience infrared as he that's right hit it simply both energy and in fact an ultraviolet photon has more energy than an infrared photon right you just don't receive them the same way oh that's so good it's only when you absorb it and increase the vibrations do you then feel heat I got to tell you something this show is good we have to enter that question but go ahead we have to end on a course we have one more point okay okay the photon has another view of the world all right okay do you remember Einstein the faster you go slower time ticks for you correct at the speed of light time stops are you saying photons don't experience time at all holy crap so the instant the photon was created in what we call the photosphere of the Sun the outer surface okay and then it went on it's eight minute and 20 seconds early to earth if you the photon you are born and you land on someone's buttocks in the same in MoMA in the same moment yes oh oh that's amazing have no concept of time I saw of that time passing you were born and absorbed in the same instant did that awesome that that's really cool I'm just saying there you go I'm just saying we gotta win they ran out of time I know all right Chuck yeah what's good was good Oh what would we call the show again I don't know Moon Moon Basin don't know start off starter Macquarie's deep questions I'm oppressed we we had a bit of these yeah man so thanks for joining us Chuck nice meeting at Chuck nice comic thank you sir I've been Neil deGrasse Tyson many of you are watching this summer listening in either way you take us we are start off and I bid you [Applause] you

Channel: StarTalk

Views: 475,500

Keywords: Star Talk, StarTalk, Neil deGrasse Tyson, Chuck Nice, The Deep, Big Bang, quantum physics, general theory of relativity, black hole, multiverse, event horizon, simulation, dark matter, dark gravity, Earth, Moon, speed of light, mysteries of the universe, Einstein, StarTalk Radio, Science Podcast, Space Podcast, Astronomy Podcast, multiverse explained, podcast, full episode, cosmic queries neil degrasse tyson, cosmic queries the deep, astronomy, science, astrophysics, physics, space

Id: z04Xw5O8XiU

Length: 40min 32sec (2432 seconds)

Published: Thu Feb 27 2020