! In an amazing development...physicists have revived an alternative theory of gravity
In the dark depths of space, our models of the universe may look chaotic, and a new study looking at the super-diffused dwarf galaxy AGC 114905 revives a controversial theory (or more accurately hypothesis) about gravity, and raises us many questions about why our galaxy is moving. .
It all starts with dark matter, as dark matter proponents believe that most of the matter in the known universe is made of matter that does not interact with light, making it invisible and undetectable, and from this dark matter part of the gravitational attraction between galaxies is formed. This theory has prevailed for nearly 50 years.
Although most cosmologists agree that there is something called dark matter, which causes spiral galaxies to spin faster than they should (to explain why the velocities of stars in galaxies were greater than expected based on Newtonian mechanics), the existence of matter Darkness alone does not answer all the questions we need.
One alternative hypothesis for dark matter is called Modified Newtonian Dynamics (MOND) or Milgrom Dynamics Framework. This hypothesis, first published by physicist Mordihai Milgrom in 1983, suggests that we do not need dark matter to fill the gravitational gaps in this vast universe if we calculate the gravitational forces that Stars in the outer galactic regions are exposed to it differently from Newton's laws.
To test Milgrom's idea that it works in concert with the star's radius or the acceleration of centripetal acceleration, we only need to consider the velocities of galaxies and in particular exotic galaxies such as ultra-diffuse galaxies.
Some ultra-diffuse galaxies appear to be almost entirely devoid of dark matter, while others are composed almost entirely of dark matter.
The ultra-diffuse dwarf galaxy AGC 114905 is about 250 million light-years away, and this is what was stated in a research paper published in 2021, but the research team found that the galaxy's rotation was very slow, which is not commensurate with the modified Newton dynamics MOND and Melgromme dynamics, but MOND was Somehow able to circumvent this apparent contradiction.
When looking at distant galaxies it is difficult to confirm the angle from which we see it, but today using simulation systems scientists suggest that a galaxy can appear elliptical even when directly facing us and changing the galaxy's interface for us will also change the speed of rotation of the galaxy.
MOND came to the bold proposition that the internal motions of an object in the universe must depend not only on the mass of the object itself, but also on the gravitational force of all other masses in the universe by a phenomenon called external field effect (EFE).
Milgrum says the results, if firmly confirmed, would be "evidence that galaxies are governed by changing dynamics rather than obeying Newton's laws and general relativity.
https://www.arageek.com/news/physicists-have-just-revived-a-previously-debunked-alternative-theory-of-gravity?fbclid=IwAR32F7OSBQ7DUGuxhqBZoTXDcftZUU-ZKyXbYCXbgSQk11q33V2N8PS098k