If Gravity Sucks What Blows?

Your questions answered! David asked “If gravity sucks, what blows?” In this answer, I discuss dark matter, gravitational lensing, white holes and dark energy. If you have a better answer, just write it in the comments. And why not add a question of your own?
Presented by Dr Andrew Robertson
Image credits:
hubble_gravlens_potw2229a_crop.jpg (double galaxy): ESA/Hubble & NASA, J. Rigby
main_image_deep_field_smacs0723-5mb (galaxies smeared): NASA, ESA, CSA, and STScI
a2744.jpg (dark matter map): NASA/CXC/ITA/INAF/J.Merten et al STScI NAOJ/Subaru ESO/VLT R.Dupke
Free resources used in this video:
Video: Da Vinci Resolve - www.blackmagicdesign.com/prod...
Image editing: www.photopea.com/
Image sourcing: unsplash.com/
Image creation: inkscape.org/
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This video was produced at Kyushu University and supported by JSPS KAKENHI Grant Number JP21K02904. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of Kyushu University, JSPS or MEXT.

Пікірлер: 17

  • @Peregringlk
    @Peregringlk9 ай бұрын

    This channel deserves more visibility.

  • @jozefsoucik3115
    @jozefsoucik31159 ай бұрын

    wish to had teacher like you.

  • @triple_gem_shining
    @triple_gem_shining7 ай бұрын

    🤓 love your work

  • @eskerbth8266
    @eskerbth8266 Жыл бұрын

    I’ve heard of something called exotic matter, something with negative mass. It’s completely theoretical but seems very interesting. What do you think this kind of theoretical predictions? Is it helpful or just nonsense?

  • @ThreeTwentysix

    @ThreeTwentysix

    Жыл бұрын

    That’s a really interesting question. Speaking (as a chemist), I think there are a few points to understand. First, ‘exotic matter’ is a blanket term for any kind of matter that we don’t normally find in the environment around us. Most (all?) exotic matter does not have negative mass. Next, we can make normal matter behave _as if_ it had negative mass. Most experiments involve super-cooling atoms and making use of quantum mechanical effects that only work on very small amounts of matter constrained in highly particular ways (confining individual atoms with lasers, for example). I am generally concerned about this type of experiment since I think it’s easy to cover up a very simple effect with a very complex system. For example, you can easily make a large particle that behaves as if it has negative mass by filling a balloon with helium gas and surrounding it with air. It moves upwards under the influence of gravity and if you put it in a car and accelerate, it will move to the front of the car, not the back. Physicists tend not to want to work with this system, however, since the simplicity is obvious. Finally, theoretical physicists often predict strange behaviour based on extending theories and analysing their associated equations. These usually end up going nowhere, but they can make important predictions that give experimentalists an idea of where to look. Historical examples include anti-matter, black holes and the Higgs boson. So when an equation predicts something interesting *with observable properties*, experimentalists sit up and pay attention. If there aren’t observable properties, however, the theories are ‘just’ philosophy. Fun to play around with, and they may inspire real science somewhere else but they aren’t science. A classic example is the many universe explanation for the weirdness of quantum mechanics. So, is it helpful or just nonsense? Well it’s certainly helpful as an exercise in theoretical physics, but no one can say at the moment if it will ever produce something genuinely useful.

  • @_robespierre
    @_robespierre4 ай бұрын

    why is mass bloating space and not inflating it when its attracting masses vs light?

  • @cosmoshfa88savant66
    @cosmoshfa88savant668 ай бұрын

    Liked & Subbed,,,,Bell on,,,Great stuff,,

  • @Sugar3Glider
    @Sugar3Glider9 ай бұрын

    I've heard that ozone is generated before lightning strikes. Do you believe it is plausible to suggest that a fluctuation in the magnetic field stored in the earth could cause enough of a reaction along the lightning path (as the two forces are pulled together) thus that it would cause ozone to be generated from the oxygen present in the air? Think of it like folding taffy.

  • @ThreeTwentysix

    @ThreeTwentysix

    9 ай бұрын

    I think it's generated after the lightning strikes, not before.

  • @WAMTAT
    @WAMTAT7 ай бұрын

    This video certainly doesn’t blow

  • @jakenfred8634
    @jakenfred86348 ай бұрын

    does an explosion count as a white hole

  • @triple_gem_shining

    @triple_gem_shining

    7 ай бұрын

    I think you're heads in the wrong place. Keep educating yourself bub

  • @john-ic5pz
    @john-ic5pz28 күн бұрын

    come now sir.... invisible matter? no mechanism proposed for why it can't be detected = bad science. that it is also unfalsifiable is also terribly convenient. ignoring electromagnetic force, 36 orders of magnitude stronger than gravity, is a lot of missing force. see what that is? ...a proposed mechanism/driving force to account for all the "missing matter" in your models. and honestly, sir, "very dense matter" that doesn't scatter x-rays is pretty unlikely isn't it? 🤔 gravity sucks, what blows? the standard model, my friends. "ONE THING that is (also) repulsive is called the electromagnetic force." * can anyone explain how black holes form....how does a collapsing star's gravity overcome the repulsive Coulombic force that becomes overwhelmingly large as the matter heats (ionizes) and comes extremely close in the compressing matter? even neutral matter follows the Leonard Jones potential curve. the curve gets awfully steep the closer the two particles approach one another! ty in advance, I am sincere in my curiosity 🙏🏻

  • @stanimirborov3765
    @stanimirborov37659 ай бұрын

    this title xD. mm malso spoiler in the film jason it sucked hard in space

  • @AR15andGOD
    @AR15andGOD7 ай бұрын

    I think it's as simple as God doing it.

  • @triple_gem_shining

    @triple_gem_shining

    7 ай бұрын

    No