Geraint Lewis - The Dark Side of the Universe

The Closer To Truth podcast drops new episodes every Wednesday. Subscribe wherever you listen: shorturl.at/hwGP3
The universe is astonishing in multiple ways, and one of its most probative features is the existence of its dark side: dark matter, interacting only via gravity, dark energy, the mysterious so-called energy of empty space that is accelerating the expansion of the universe, and black holes, from which not even light can escape.
Register for a free account to get exclusive subscriber benefits like early access to new episodes: bit.ly/3He94Ns
Geraint F. Lewis is a Professor of Astrophysics at the Sydney Institute for Astronomy, part of the University of Sydney’s School of Physics. He is best known for his work on dark energy, gravitational lensing, and galactic cannibalism, the study of galaxies which collide and absorb parts of each other.​
Watch more videos on black holes, dark energy, and dark matter: shorturl.at/eCHMZ
Closer To Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.

Пікірлер: 293

  • @watgaz518
    @watgaz51816 күн бұрын

    If there is approx 95% of the universe that we don’t see/comprehend, how can we think that we properly understand the approx 5% of visible matter? We have no idea what influences the 95 has over 5 across/throughout the universe. Events that occur in our observable piece of universe maybe affected differently beyond our observation edge.

  • @aiya5777

    @aiya5777

    15 күн бұрын

    therefore God

  • @deathbydeviceable

    @deathbydeviceable

    15 күн бұрын

    You can stop asking so many questions when you put God in the equation and no, it doesn't mean you have a low iq. I mean, look at all the hurdles you "scientists" are facing through to just babble like you're smart. Believing in God takes more confidence this day and age. It's the counter culture actually right now 😂

  • @mtshasta4195

    @mtshasta4195

    15 күн бұрын

    multiple dimensions exist that we will never see or understand and the math we use fits the model we understand--so far..

  • @kuyab9122

    @kuyab9122

    15 күн бұрын

    ​@@aiya5777 So if you don't understand something, ergo God - like the ancient times?

  • @aiya5777

    @aiya5777

    15 күн бұрын

    @@kuyab9122 it's more like if you can understand it, ergo God to put it into perspective. just Why do ALL things have units? Time, length, energy, mass. units, just What are they? and Why should we be equipped with the necessity to understand these units to begin with? there shouldn't be any conscious agent creating the universe with a particular purpose in mind,🤷 egro the universe shouldn't have any particular purpose And yet it's like the entire universe is written methodically, for the sake of being understood by us. the readers

  • @jage6126
    @jage612616 күн бұрын

    2:56 Some serious dark energy there...

  • @Tsobanian

    @Tsobanian

    16 күн бұрын

    Even the interview has its "dark side" (or black screen I should rather say)

  • @NightBazaar

    @NightBazaar

    16 күн бұрын

    I think I could hear a wheeze.

  • @johnayres2303
    @johnayres230315 күн бұрын

    Is it plausible that the current laws of gravity are just wrong for the very large scale of galaxies and as such dark matter does not exist?

  • @AlphynKing

    @AlphynKing

    15 күн бұрын

    Yes, that’s also possible, there are theories of modified gravity that are posited to explain the same problems that dark matter is proposed to solve, but it’s still very much up in the air

  • @lambda4931
    @lambda493115 күн бұрын

    Why did Eddington’s eclipse measurements come close to Einstein’s prediction when dark matter was not even considered by Einstein or Eddington?

  • @birdthompson

    @birdthompson

    15 күн бұрын

    because of the small distance

  • @jamesruscheinski8602
    @jamesruscheinski860211 күн бұрын

    is it correct to understand that space as well as light is deflected or bends around galaxy? what might that say about space-time curvature / gravity of galaxy?

  • @letitsnow8518
    @letitsnow851814 күн бұрын

    Please have Dr. Lewis back again

  • @josephhruby3225
    @josephhruby322515 күн бұрын

    Any opportunity to better understand the dark factors is worth pursuing. Bravo

  • @streamofconsciousness5826
    @streamofconsciousness582615 күн бұрын

    Maybe the Galaxies are held together by surface tension, like a bubble of water on a desk, it should flatten out and be one water molecule deep but it keeps it's form as a bubble or drop standing as high as it is wide. Did Closer to the Truth look into the Electric Universe theory at any point. I find it odd that we see as much Matter 5% as we know about our Oceans 5%.

  • @stellarwind1946
    @stellarwind194615 күн бұрын

    We don’t actually know. Dark matter and dark energy are hypothetical concepts for gravitational enigmas we’ve yet to solve.

  • @jamesruscheinski8602
    @jamesruscheinski860211 күн бұрын

    black holes have some form of dark matter rotating around in galaxy, as well as ordinary matter? how might measure dark matter rotating around black hole?

  • @stephenzhao5809
    @stephenzhao580915 күн бұрын

    1:03 let's run through that cause you it's important to understand how that works cause you're just making a statement that I know was true but I want to understand how it works so how does gravitational lensing allow you to determine the amount of total mass dark matter plus ordinary matter how can lensing help you determine that. 1:24 GL:

  • @ItsEverythingElse
    @ItsEverythingElse14 күн бұрын

    I don't believe in dark matter/energy. I think there is some fundamental aspect of space-time that we don't understand yet.

  • @letitsnow8518

    @letitsnow8518

    14 күн бұрын

    This is the best we get, science has to start somewhere

  • @chrisgriffiths2533
    @chrisgriffiths253315 күн бұрын

    Genuine True Believer this Cosmology Bloke.

  • @simonhibbs887

    @simonhibbs887

    15 күн бұрын

    The fact is we have these observations. How they are interpreted is of course up for grabs, I think there's a non zero chance 'dark matter' will turn out to be some other effect or set of effects but we will find that out by doing physics and cosmology. It's only by practicing these sciences that we even have these questions at all.

  • @chrisgriffiths2533

    @chrisgriffiths2533

    15 күн бұрын

    @@simonhibbs887 Questions come from Human IQ. Science is a Subset of that. Any Human Can Ask Questions. Sound Science can Withstand Questions from Anyone and Everyone.

  • @simonhibbs887

    @simonhibbs887

    14 күн бұрын

    @@chrisgriffiths2533 Sure.

  • @aporist
    @aporist16 күн бұрын

    The problem of the physicists is the term 'matter'. Matter is everything that exists in all its states - solid, liquid, gas, quantum (and transitions). Wonder why they call the quantum state 'dark' ???

  • @floridaholdings
    @floridaholdings15 күн бұрын

    my back is hurting just watching this

  • @ashirbadthapa
    @ashirbadthapa16 күн бұрын

  • @neilpepper3575
    @neilpepper357515 күн бұрын

    The universe doesn't have "sides"

  • @feltonhamilton21
    @feltonhamilton2115 күн бұрын

    Apart from other potential universes . The dark side of the universe is undisturbed frozen vacuum pressure where time doesn't exist not even a second but inside this universe there is moving pressure all around the universe and on different levels of cooling temperatures viciously moving through wormholes and emanating microwaves out from pressure and turning into electric magnetic gravity because it is still in its cooling stage and then it is squeezed into electricity and will remain electricity until it is ready to start shedding radiation dust and then the dust is used to form spheres to be used as a powerhouse for generating microwaves that can generate enough heat to reach the level of a star but on a microscopic level it's all about the nucleus which only generates a few microwaves around itself and every time the value drops within the nucleus before it starts decaying into a different generator creating the same microwaves but on a smaller scale of energy. This is being repeated on all levels of existence regardless if it's galactic or microscopic this including the center of suns stars and planets and moons and black holes but things that have been pushed around by explosions and gravity are not a part of the equation of something being stable it's just only a missing link and bound to land anywhere inside the cosmos. Antimatter can be created by freezing gravity at a very high speed inside a vacuum chamber and maintaining the right amount of cooling pressure that can freeze gravity back into a invisible milkshake foam inside a small box chamber enough power to support a planet on top of it before it could start emanating heat and turn into a supernova.

  • @JungleJargon
    @JungleJargon15 күн бұрын

    There are three rates to consider. 1. The diminishing effect or draw of gravity away from the center of mass. 2. The increasing rate of time away from the center of mass. 3. The increasing measure of distance away from the center of mass. Speed is measured by time and distance which change and that changes the speed of light and causation. Distance gets longer without gravity and time goes by faster, both of which speed up causation. The light has to arrive at a farther distance faster when distance is stretched *and* time also goes by faster. *Then* there is the first thing to consider and that is the diminishing draw of gravity which means things eventually slow down the farther away they are from the center mass of a galaxy. (It's not complicated.) 😎

  • @simonhibbs887

    @simonhibbs887

    15 күн бұрын

    All of which is captured in the equations of general relativity, which physicists use in making these simulations and calculations.

  • @tomjackson7755

    @tomjackson7755

    15 күн бұрын

    @@simonhibbs887 Jungle likes to ignore the basics of relativity to tell his 'stories'.

  • @JungleJargon

    @JungleJargon

    15 күн бұрын

    @@tomjackson7755 You like to say nothing at all.

  • @JungleJargon

    @JungleJargon

    15 күн бұрын

    @@simonhibbs887 So you agree that the speed of light changes away from the center of mass compared to our measure of distance and rate of time closer to the center of mass.

  • @tomjackson7755

    @tomjackson7755

    15 күн бұрын

    @@JungleJargon You like to say obviously wrong things. Remember gravity doesn't effect time. Remember your measurement relative of another object doesn't change what the object's actual measurement for itself is.

  • @MegaDonaldification
    @MegaDonaldification15 күн бұрын

    There are more stronger dark matters than life itself and it is always growing. For man, he has every part of light but he MUST use his limbs or get recued for reincarnation. Every single being who have existed MUST finish his part on earth.

  • @neilcrowley4812
    @neilcrowley481216 күн бұрын

    No flies on this guy.

  • @NightBazaar

    @NightBazaar

    16 күн бұрын

    Except for that pesky blood thirsty vampire fly going for the jugular and soaring around looking for a 2nd jab.

  • @deathbydeviceable

    @deathbydeviceable

    15 күн бұрын

    You want at least one fly 😂

  • @allahgod298
    @allahgod29814 күн бұрын

    The radius of the known universe is somewhere around 100 quintillion miles.

  • @letitsnow8518

    @letitsnow8518

    14 күн бұрын

    Wrong

  • @tomazflegar
    @tomazflegar15 күн бұрын

    And yet we are so sure we know 😁

  • @wagfinpis
    @wagfinpis15 күн бұрын

    Sounds like he enjoys his work.

  • @ToxicSkittl3
    @ToxicSkittl316 күн бұрын

    When you get down to the measurement of the universe, what is seen is only the sruface. When you get into what is beyond the spaghettification of the surrounding black hole, you must apply the matter is not destroyed. Essentially, the mass and matter emitted through Earthly/Heavenly prime universe is transferred through the crunch. Ideally, if the entire universe is measured, humanity is arguably 3% total informational weight. The power that could be harnessed on the brink-point is beyond dangerous. ARGUABLY this is the true Hand of God. The final frontier. Do not attempt to harness BHE. God will strike us down.

  • @EnthusiasticTent-xt8fh
    @EnthusiasticTent-xt8fh16 күн бұрын

    I took Astronomy because I wanted to complete my AS requirement, which I started in HVACR. I have come to the conclusion that the foundations of the cosmos are not natural, but supernatural.

  • @rob.j.g

    @rob.j.g

    15 күн бұрын

    The more willing people are to leap to supernaturalistic explanations, the lower their standards for what constitutes truth.

  • @EnthusiasticTent-xt8fh

    @EnthusiasticTent-xt8fh

    15 күн бұрын

    @rob.j.g Unfortunately for you, I am smart enough to do so and you aren't smart enough to know whether I did.

  • @thomasridley8675

    @thomasridley8675

    15 күн бұрын

    ​@@EnthusiasticTent-xt8fh Now what caused you to reach that conclusion ?

  • @ManiBalajiC

    @ManiBalajiC

    15 күн бұрын

    ​@@EnthusiasticTent-xt8fheverything looks like magic until we start exploring it.

  • @EnthusiasticTent-xt8fh

    @EnthusiasticTent-xt8fh

    15 күн бұрын

    @@ManiBalajiC Sorry, but Magic is the foundation.

  • @michelangelope830
    @michelangelope83016 күн бұрын

    For whatever reason people don't understand what is the point. The claim the Quran has been memorized has never been tested. Are you interested? Do you think it is a trivial matter? Does it matter at all? Muslims say the Quran has been memorized and atheists who want proof and evidence don't seem impressed and believe the claim without questions asked. Either many people are pretending to be much more intelligent than me or atheists don't care about evidence. If someone is able to write the Quran from memory i would be incredibly impressed. Are you kidding me?, to memorize the Quran would be the equivalent of running one hundred meters in one second. Atheists would not be able to prove their own existence to themselves if the logical conclusion is God exists and lose their own children believing without questions asked that gambling causes a brain disease, and when they are told they don't care. I will give my three bedroom flat in Spain in the city of Burgos to the first muslim, or any other person for that matter, who writes the Quran from memory. Who wants to accept the challenge? I am a psychologist and person of many talents and I have discovered atheism is a logical fallacy that assumes God is the religious idea of the creator of the creation to conclude wrongly no creator exists because a particular idea of God doesn’t exist. The true God is Spinoza's God. Thank you.

  • @makeracistsafraidagain

    @makeracistsafraidagain

    15 күн бұрын

    Gods aren’t real

  • @aiya5777

    @aiya5777

    15 күн бұрын

    you're giving too much credit to yourself🤭

  • @yarongita
    @yarongita13 күн бұрын

    Pure speculation. Pure ignorance. Ultimate pretentious. Pseudoscience.

  • @makeracistsafraidagain
    @makeracistsafraidagain15 күн бұрын

    It’s scary. We want the universe to care about us. But it doesn’t.

  • @aiya5777

    @aiya5777

    15 күн бұрын

    it's a lot scarier to see you ignoring God who blatantly told us that he created his creations *in darkness*

  • @deathbydeviceable

    @deathbydeviceable

    15 күн бұрын

    ​@aiya5777 he's giving them a chance to believe through unconditional love. Time's running out though