What's Great About GAIA? With Phil Plait

Sdílet
Vložit
  • čas přidán 12. 09. 2024
  • Phil Plait - Bad Astronomer, science blogger, self-described dork and Crash Course Astronomy guy - tells EarthSky's Deborah Byrd about the amazing discoveries the GAIA space telescope has brought us.
    This video was drawn from a livestream interview on Monday 12th August, 2024 - join us every Monday at 12:15 p.m. central (17:15 UTC) for live chats with awesome scientists!
    #space #astronomy #gaia #spacetelescope #esa #stars #galaxy #milkyway #discovery #science #crashcourse

Komentáře • 2

  • @shawns0762
    @shawns0762 Před 27 dny

    General Relativity predicts dilation wherever there is an astronomical quantity of mass. Dilation explains dark matter. In the 1939 journal "Annals of Mathematics" Einstein wrote -
    "The essential result of this investigation is a clear understanding as to why the Schwarzchild singularities (Schwarzchild was the first to raise the issue of General Relativity predicting singularities) do not exist in physical reality. Although the theory given here treats only clusters (star) whose particles move along circular paths it does seem to be subject to reasonable doubt that more general cases will have analogous results. The Schwarzchild singularities do not appear for the reason that matter cannot be concentrated arbitrarily. And this is due to the fact that otherwise the constituting particles would reach the velocity of light."
    He was referring to the phenomenon of dilation. Mass that is dilated is smeared through spacetime relative to an outside observer. It's the phenomenon our high school teachers were talking about when they said "mass becomes infinite at the speed of light". A graph illustrates its squared nature, dilation increases at an exponential rate the closer you get to the speed of light. A time dilation graph illustrates the same phenomenon, it's not just time that gets dilated.
    Dilation will occur wherever there is an astronomical quantity of mass because high mass means high momentum. This includes the centers of very high mass stars and the majority of galaxy centers.
    The mass at the center of our own galaxy is dilated. This means that there is no valid XYZ coordinate we can attribute to it, you can't point your finger at something that is smeared through spacetime. In other words that mass is all around us.
    Dilation does not occur in galaxies with low mass centers because they do not have enough mass to achieve relativistic velocities. It has been confirmed in 6 very low mass galaxies including NGC 1052-DF2 and DF4 to have no dark matter, in other words they have normal rotation rates. All binary stars have normal rotation rates for the same reason.

  • @shadimehr9348
    @shadimehr9348 Před 28 dny

    😍😍😍