perspective

Comments

• ryan213@lemmy.ca ⁨2⁩ ⁨years⁩ ago

  #4 Op’s mom

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  • avidamoeba@lemmy.ca ⁨2⁩ ⁨years⁩ ago

    rip

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  • Evil_Shrubbery@lemm.ee ⁨2⁩ ⁨years⁩ ago

    The ultimate orbs, and I shall ponder them hard.

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    • militaryintelligence@lemmy.world ⁨2⁩ ⁨years⁩ ago

      I pondered my orb last night

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  • Hupf@feddit.org ⁨2⁩ ⁨years⁩ ago

    Would have been, but she didn’t fit in the picture

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    • some_designer_dude@lemmy.world ⁨2⁩ ⁨years⁩ ago

      She’s represented by black pixels.

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  • shoki@lemmy.world ⁨2⁩ ⁨years⁩ ago

    beat me to it

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• observantTrapezium@lemmy.ca ⁨2⁩ ⁨years⁩ ago

  Astrophysicist here. Yes, space is crazy, but interesting things to keep in mind:

  1. The size of a star is determined by something called the photosphere. With those extremely massive stars, you can be hundreds of millions of kilometres “inside” and not yet know it.
  2. Similar story with supermassive black holes, from the perspective of an astronaut falling in, they wouldn’t really be able to tell when they cross the horizon because the tidal forces there are very small (they will inevitably fall towards the centre and get spaghettified at some point)

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  • KillingTimeItself@lemmy.dbzer0.com ⁨2⁩ ⁨years⁩ ago

    as a non astrophysicist, or just a non astronomer in general. it weirds me out every time i remember that there is literally a part of the universe that apparently exists, of which we will never be able to see, because the light from that part of the universe, quite literally hasn’t reached us yet.

    The observable universe is inconceivably massive. But it just keeps going.

    And to think it’s not an improbable concept for humanity to recreate the physics behind a big bang in a controlled setting, somewhere down the line from here, is certainly an interesting thought.

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    • psud@aussie.zone ⁨1⁩ ⁨year⁩ ago

      the light hasn’t reached is yet

      The light will never reach us, space is expanding faster than light between here and there

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  • shneancy@lemmy.world ⁨2⁩ ⁨years⁩ ago

    :0 how can you be inside a star and not know it? I thought they all had a surface like our Sun

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    • observantTrapezium@lemmy.ca ⁨2⁩ ⁨years⁩ ago

      See my response below to Captain Aggravated about how dilute those large stars are.

      It’s an interesting question whether anybody would actually feel spaghettification 😁 I actually don’t know. You can use physics to calculate the proper time derivative of the tidal forces, but you need biology to define the start (and end…) of the process. My intuition says that it probably happens too fast, so once the tidal forces are strong enough to be perceptible, they grow strong enough to rip you apart before you realize (again, just a hunch).

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    • pool_spray_098@lemmy.world ⁨2⁩ ⁨years⁩ ago

      Right? How can you not know it?

      Hmm, am I in the star yet? I mean my body is now made of million degree hot plasma, but I’m still not sure…

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  • unknown@sh.itjust.works ⁨2⁩ ⁨years⁩ ago

    Hi Astrophysics,

    I always wondered why they draw black holes like they do in that the accretion looks like it’s drawn in two planes. I would have thought it would have looked a bit more like a saturns rings? Or is it exactly like saturns rings but we see the whole ring bent round the top because a black hole bends the light around so we can see it? Or is it something else entirely that they are trying to depict here?

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    • phoenixz@lemmy.ca ⁨2⁩ ⁨years⁩ ago

      Black homes are so massive and heavy that they bend light (well, technically every piece of mass does, even yo momma). It’s bend so extreme that that accretion disk appears warped.

      A similar thing happens with neutron stars that can also bend light in such a way that you can actually see part of the back of the star (if you were able to see it anyway, it would be dark) as light that would be emitted from parts of the back would warp around to the front where you could see it

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    • observantTrapezium@lemmy.ca ⁨2⁩ ⁨years⁩ ago

      Yep, you got it right. The accretion disk is actually really flat. Those images are produced in simulations that take into account the curved (and very complex) paths light takes in the vicinity of a black hole. These images really depend on the angle between the line of sight and the disk.

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    • OrganicMustard@lemmy.world ⁨2⁩ ⁨years⁩ ago

      The second one. The image is simulated as how an external observer would see it. It was firstly done for the Interstellar movie.

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    • FrenziedFelidFanatic@yiffit.net ⁨2⁩ ⁨years⁩ ago

      Or is it exactly like saturns rings but we see the whole ring bent round the top because a black hole bends the light around so we can see it?

      Hit the nail pretty hard on the head there

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  • captain_aggravated@sh.itjust.works ⁨2⁩ ⁨years⁩ ago

    Documentary watcher here. Isn’t the “photosphere” of the star defined by the visible surface? It is my understanding you could be “hundreds of millions of kilometers inside” the corona and not know it, but inside the photosphere?

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    • observantTrapezium@lemmy.ca ⁨2⁩ ⁨years⁩ ago

      Yes, but red supergiants differ from the sun in that their photospheres are extremely dilute and don’t have a sharp transition to the corona. I don’t know the details of this particular star but take Betelgeuse as an example (it’s probably not particularly large for this catrgory), it’s radius is ~640 the sun’s per Wikipedia, which gives a volume of ~260 million that of the sun. But it is only x15 times as massive as the sun, so on average ~20 million times less dense.

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  • UnderpantsWeevil@lemmy.world ⁨2⁩ ⁨years⁩ ago

    I was under the impression that the time it would take you to get spaghettified would render the fear of such an experience irrelevant, as you’d be long dead of natural causes before then.

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    • observantTrapezium@lemmy.ca ⁨2⁩ ⁨years⁩ ago

      In the case you are unlucky enough to encounter the black hole “heads on” and fall into it radially, the proper time timescale to spaghettification is the size of the event horizon divided by the speed of light. The most supermassive black holes will have a horizon of around one light day, so that’s what we’re working with, a matter of days. If you come in on the most tangential orbit possible though, I guess you’re buying some time but I’ve never heard that it’s supposed to take many years of proper time (I doubt that claim a little bit, but haven’t calculated myself).

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  • radicalautonomy@lemmy.world ⁨2⁩ ⁨years⁩ ago

    they will inevitably fall towards the centre and get spaghettified at some point

    Not before they witnessed the birth and death of thousands of civilizations! (I know they wouldn’t actually be able to witness them, not having the right equipment and being dead in due order, it’s just neat to think about relativity in that context. 😊)

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  • SanndyTheManndy@lemmy.world ⁨2⁩ ⁨years⁩ ago

    What really are gravitational waves? Are they like electromagnetic waves? Do they cause orbital decay? I have so many questions.

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    • observantTrapezium@lemmy.ca ⁨2⁩ ⁨years⁩ ago

      They are quite similar to electromagnetic waves, but also quite different. They are produced by masses accelerating (just like EM waves are produced by charges accelerating), and indeed cause orbital decay. But this orbital decay is only important in relativistic systems (so the Earth, which is orbiting the sun at 0.0001 the speed of light, is not going to fall into the sun because of gravitational waves).

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    • SpacetimeMachine@lemmy.world ⁨2⁩ ⁨years⁩ ago

      I highly suggest you look up PBS spacetime on YouTube. They have an incredible amount of very informative videos on black holes and gravitational waves. As well as pretty much any other astrophysics topic you can think of (and many you can’t!)

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    • CheeseNoodle@lemmy.world ⁨2⁩ ⁨years⁩ ago

      Gravitational waves do cause orbital decay as the energy required to create them comes from the objects own momentumn.

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• solsangraal@lemmy.zip ⁨2⁩ ⁨years⁩ ago

  what’s crazier: you’d need many side by side monitors to show our solar system at this scale

  www.joshworth.com/…/pixelspace_solarsystem.html

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  • flora_explora@beehaw.org ⁨2⁩ ⁨years⁩ ago

    Oof, this was wild!

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• southsamurai@sh.itjust.works ⁨2⁩ ⁨years⁩ ago

  You load 618 ton, and whattaya get? Another light year older and deeper in the event horizon.

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  • qjkxbmwvz@startrek.website ⁨2⁩ ⁨years⁩ ago

    St. Hawking don’t you call me 'cuz I can’t go…

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    • normanwall@lemmy.world ⁨2⁩ ⁨years⁩ ago

      [deleted]

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    • Astronauticaldb@lemmy.world ⁨2⁩ ⁨years⁩ ago

      I oweeeeeee my Sol to the black hole…

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• bjoern_tantau@swg-empire.de ⁨2⁩ ⁨years⁩ ago

  Pondering orbs again, are we?

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  • Evil_Shrubbery@lemm.ee ⁨2⁩ ⁨years⁩ ago

    What tf do you mean again?? Explain yourself heretic!

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• TankovayaDiviziya@lemmy.world ⁨2⁩ ⁨years⁩ ago

  *cosmic dread intensifies

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• ton618@lemm.ee ⁨2⁩ ⁨years⁩ ago

  I’m in this picture…and I like it.

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  • MelodiousFunk@slrpnk.net ⁨2⁩ ⁨years⁩ ago

    I knew lemmy was growing but this is far out, man.

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    • ton618@lemm.ee ⁨2⁩ ⁨years⁩ ago

      Yes… approximately 18.2 billion light-years out (⁠☞⁠ ͡⁠°⁠ ͜⁠ʖ⁠ ͡⁠°⁠)⁠☞

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• umbrella@lemmy.ml ⁨2⁩ ⁨years⁩ ago

  [deleted]

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  • fossilesque@mander.xyz ⁨2⁩ ⁨years⁩ ago

    You’re nothing and nothing matters and that’s ok. It’s beautiful.

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    • umbrella@lemmy.ml ⁨2⁩ ⁨years⁩ ago

      [deleted]

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    • militaryintelligence@lemmy.world ⁨2⁩ ⁨years⁩ ago

      Man, I think about that all the time. We aren’t even a drop in the bucket, not a blip in the history of the universe. To me that makes life immeasurably precious.

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    • GarbageShoot@hexbear.net ⁨2⁩ ⁨years⁩ ago

      Spatially small =/= doesn’t matter. You can’t just jump from physical characteristics to values like that. What happened to being scientific?

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    • The_Che_Banana@beehaw.org ⁨2⁩ ⁨years⁩ ago

      We are stardust, we are golden We are billion year old carbon And we got to get ourselves back to the garden

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  • Evil_Shrubbery@lemm.ee ⁨2⁩ ⁨years⁩ ago

    Yes, and you are very correct.

    It’s not really possible with our minds.
    Much like with numbers, anything beyond small numbers/points our minds just turn into representative idea (a meme) which we tend to perceive on a logarithmic scale (like how people tend to think a thousand, a million, and a billion are apart by about the same-ih or only a bit differently). Thats even how our biosensory bits work, along with how we interpret/perceive information from them.

    It’s great for achieving practical stuff, but it’s not real.

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• PhlubbaDubba@lemm.ee ⁨2⁩ ⁨years⁩ ago

  Every time I see these ultramassive black holes all I see is the megastructure uber planet you can build around them, or if organic life has gone out of fashion at that point, the megastructure uber computer.

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  • A_Union_of_Kobolds@lemmy.world ⁨2⁩ ⁨years⁩ ago

    Sounds like some shit the Culture does

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    • sulgoth@lemmy.world ⁨2⁩ ⁨years⁩ ago

      Or the Bobs

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  • marcos@lemmy.world ⁨2⁩ ⁨years⁩ ago

    Hard to find enough material to encircle that one.

    Maybe that’s why those “dark matter only” galaxies exist.

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    • PhlubbaDubba@lemm.ee ⁨2⁩ ⁨years⁩ ago

      It would take multiple galaxies of matter to pull the material together, but if you’re planning on building a megastructure of this scale that’s probably not any trouble for you

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• xrtxn@lemmy.sdf.org ⁨2⁩ ⁨years⁩ ago

  I had a stroke trying to understand this

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  • BeanGoblin@lemmy.blahaj.zone ⁨2⁩ ⁨years⁩ ago

    Big things big. Bigger things VERY big.

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    • tiramichu@lemm.ee ⁨2⁩ ⁨years⁩ ago

      The problem is the layout is trash.

      It needs horizontal dividing lines to show that the bodies are presented in pairs at the same scale.

      When you first look at it, it seems like all six are in one picture at the same scale, then you start noticing things appearing twice, and think “hang on that’s not right” and work it out, but just two lines would have solved it immediately.

      Design, people! Design!

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    • underwire212@lemm.ee ⁨2⁩ ⁨years⁩ ago

      Bigger thing even bigger than very big thing

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    • ohwhatfollyisman@lemmy.world ⁨2⁩ ⁨years⁩ ago

      yep. space facts can be quite arousing, indeed.

      better than having a stroke to nude pics.

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  • MimicJar@lemmy.world ⁨2⁩ ⁨years⁩ ago

    O <— Sun Earth —> .

    O <— Stephen Sun —> .

    O <— Tom Stephen —> .

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    • psud@aussie.zone ⁨1⁩ ⁨year⁩ ago

      O <---- OP’s mom Tom ----> .

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  • Anticorp@lemmy.world ⁨2⁩ ⁨years⁩ ago

    Earth small. Sun bigly. Other sun biglier. Black hole bigliest.

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    • Lemminary@lemmy.world ⁨2⁩ ⁨years⁩ ago

      You have a way with words.

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  • steal_your_face@lemmy.ml ⁨2⁩ ⁨years⁩ ago

    I’m stroking right now too

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• NigelFrobisher@aussie.zone ⁨2⁩ ⁨years⁩ ago

  Why doesn’t the big star simply eat the smaller stars?

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  • xenoclast@lemmy.world ⁨2⁩ ⁨years⁩ ago

    They do, but space is very big, and gravity is relatively weak in comparison.

    The strength of gravity drops of exponentially with distance. Which is hard to imagine because we’re stuck the earth so solidly by gravity… but that’s just cuz we’re on it’s surface.

    For a star to consume another star they need to be really close.

    This is made even more difficult when you consider they’re all moving through empty space really really fast.

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  • psud@aussie.zone ⁨1⁩ ⁨year⁩ ago

    Look up “the great attractor”.

    The “big crunch” is the (probably incorrect) hypothesis that there’s enough mass to pull the universe into a single black hole - where everything is eaten by black holes, even all the black holes (nothing to do with the great attractor)

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• lettruthout@lemmy.world ⁨2⁩ ⁨years⁩ ago

  That’s it… I’m not getting out of bed today.

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  • Lemminary@lemmy.world ⁨2⁩ ⁨years⁩ ago

    I feel insignificant, what’s the point of life even.

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    • shneancy@lemmy.world ⁨2⁩ ⁨years⁩ ago

      there isn’t one! So feel free to make it up, you probably won’t find it, or won’t know when you’ve found it, but the mere act of looking will point you in the right direction - going out and enjoying the absurdly rare phenomenon of being alive. You and I are a cosmic anomaly, friend, isn’t that cool?

      for a more comprehensive guide on what do when you realise life is meaningless: refer to existentialism and absurdism

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• don@lemm.ee ⁨2⁩ ⁨years⁩ ago

  Now compare TON 618 with Phoenix A.

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• OsrsNeedsF2P@lemmy.ml ⁨2⁩ ⁨years⁩ ago

  en.m.wikipedia.org/wiki/TON_618

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• MonkderVierte@lemmy.ml ⁨2⁩ ⁨years⁩ ago

  There’s always a bigger, uh, sun.

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• umbraroze@lemmy.world ⁨2⁩ ⁨years⁩ ago

  Somewhere in late 2000s I saw one of the most mind-melting GIFs I’ve seen that compared the Solar System objects to the largest known stars at the time. This kinda reminded me of that.

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  • arken@lemmy.world ⁨2⁩ ⁨years⁩ ago

    This gem also springs to mind

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• KillingTimeItself@lemmy.dbzer0.com ⁨2⁩ ⁨years⁩ ago

  ok so, this post reminds me, a while ago i archived all of the older Vsauce content, and i binged through the vast majority of it, and i can swear there was a video from him about the scale of the universe, or the scale of things in the universe, but i can’t for the life of me find it.

  Either it’s hiding somewhere, or i’m making some shit up and it isn’t real lol.

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  • shneancy@lemmy.world ⁨2⁩ ⁨years⁩ ago

    it’s quite possibly somewhere in there. The blessing and the curse of Vsauce videos is that you never know what’s going to be inside of it

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    • KillingTimeItself@lemmy.dbzer0.com ⁨2⁩ ⁨years⁩ ago

      yeah, that’s kind of the problem i’m having lol, doesnt help that his video titles are often a little obtuse.

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  • dumbass@leminal.space ⁨2⁩ ⁨years⁩ ago

    Not Vsauce, but corridor crew did a video like that.

    Or maybe its this from the D!NG channel hosted by Vsauce Jake

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  • MindTraveller@lemmy.ca ⁨2⁩ ⁨years⁩ ago

    Maybe it was by a different educational YouTuber. I’m thinking Veritasium.

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    • KillingTimeItself@lemmy.dbzer0.com ⁨2⁩ ⁨years⁩ ago

      that’s possible, but vasuce has a very specific video style, i guess i should probably go watch a couple veritasium videos to be sure lol.

      The obvious answer is that it’s actually something related to “the scale of the universe” which is another really cool project, but i don’t think it’s that one either.

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• BlastboomStrice@mander.xyz ⁨2⁩ ⁨years⁩ ago

  I was just thinking of such a similar comparison today with a similar way of comparing them! (Earth<<Sun<<SagittariusA)

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• UlyssesT@hexbear.net ⁨2⁩ ⁨years⁩ ago

  Won’t Ton 618 come and wash away the rain?

  Image

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• kureta@lemmy.ml ⁨2⁩ ⁨years⁩ ago

  I read it as “stepson” and thought it was a low res picture of pizza. I guess I am a bit sleep deprived.

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• sloppysol@lemmy.world ⁨2⁩ ⁨years⁩ ago

  Good effort. I feel the dream, and it’s so much more. Life ain’t good, it’s a FUCKING lot, and there’s some good. Don’t search, just feel yo. FEEEEeeeEeEl.

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• anonymouse2@sh.itjust.works ⁨2⁩ ⁨years⁩ ago

  THE UNIVERSE ^Ton 618

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