Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Anonymous
Anonymous asked in Science & MathematicsAstronomy & Space · 2 months ago

Is this really science?

The observed universe stopped fitting the model of gravity, so we made dark matter because the model couldn’t possibly be wrong.

Update:

“So how dense is dark matter?”, “it’s whatever you need it to be.”, “Omg that’s awesome!”

16 Answers

Relevance
  • D g
    Lv 7
    2 months ago

    omg   really you expect someone here to teach you something as complex as that    ... gravity didnt  fail  

    what happens  is the  universe is   expanding  at a faster rate this people dont understand unless there is something they cant see  pulling it  or providing another force 

  • Anonymous
    2 months ago

    That's exactly what science is, coming up with explanations for stuff that doesn't match up with what they think they understand, and testing those explanations until they're satisfied with the answer.

    "Dark matter" is a placeholder for the real answer, which is either going to be new understandings of matter or that the math was wrong in the first place.

  • 2 months ago

    We didn't "make" dark matter to continue to propagate our current theories!

    Dark matter actually explains more than previously known AND STANDS UP to scrutiny!

    It is not a simplistic concept as your puerile and half baked question implies.

  • Anonymous
    2 months ago

    Most of the Universe's weight is made of the 50 shades of gray matter.

  • 2 months ago

    No one "made dark matter" any more than anyone made ordinary matter or dark energy or lunar craters.  Dark matter was first proposed as the most probable explanation for the observed high rotational speed of galaxies (Vera Rubin was the astronomer).

  • 2 months ago

    Dark matter is a proposed theory that was put forth to explain why spiral galaxies are rotating more like solid disks, rather than by straight Newtonian laws of gravitation. In other words, could you please explain to us why Mercury, Earth, Jupiter, and Neptune all make one complete orbit of the Sun in just one year?

    Please tell us your preferred explanation.

  • 2 months ago

    Yes, I know exactly what you mean and that's why I don't believe in exotic dark matter.  However, I do believe it's possible that there's enough baryonic dark matter to explain it, or that MoND might.

  • 2 months ago

    Yes, that is what scientists did. Either our theory of gravity is wrong or something unseen is producing more gravity. Since Newton's Law of gravity and general Relativity have worked everywhere else, scientists would rather believe in unseen mass rather than believe the laws of gravity are wrong. 

    Of course, those scientists could be wrong. 

  • neb
    Lv 7
    2 months ago

    Every test of Einstein’s general relativity has verified its description of gravity completely. That is the reason why physicists are loathe to toss out general relativity and why they propose dark matter as an alternate explanation.

    Various modifications of both Newton’s gravity (MOND theories) and general relativity (tensor-vector-scalar theories -TeVeS ) have been used to try to do away with dark matter. None have been successful, and all have the serious flaw of being ad hoc - the so called interpolating function in MOND theories that is tweaked to match observation and in the TeVeS mods the Einstein-Hilbert action in the general relativity Lagrangian has addition vector and scalar terms that are tweaked. There seems to be no physical justification for these ad hoc terms, unlike the beautiful logical flow of general relativity.

    And there are lots of reasonable candidates for dark matter that are simply weakly interacting particles similar to neutrinos. Sterile neutrinos, axions, and WIMPS all have at least a plausible theoretical basis.

    Also keep in mind that we didn’t detect the Higgs boson for nearly 50 years after it’s theoretical proposal. We simply didn’t have the technology to find it.

    And lastly, we have detected zero curvature in the universe so that the universe appears to be at the critical energy density for overall ‘flatness’. The amount of visible matter is far too small to explain that.

  • 2 months ago

    sort of....

    Better:

    the observed rotation rate of galaxies does not fit the models formulated with gravity forces. Dark matter was then postulated so that the rotation rates made sense.

Still have questions? Get your answers by asking now.