Cosmology | Dark Matter | Big Bang | Other Tutorials Dark Matter Dark matter: Since the 1930s, evidence for dark matter has been compelling. Why are scientists so convinced that there is such a thing called dark matter in our universe? Stars far out of its galaxy rotate at an extremely quick pace. With angular momentum, they do rotate at a slower pace than those stars nearer to the active galactic nuclei in the middle. However, it has been calculated that the speeds of the stars near the active galactic nuclei as well as those far out of the nuclei are too much for the supposed gravity which the active galactic nuclei with a fixed mass in the middle of the galaxy can contain. In fact, the whole galaxy, would fly off, but it did not. This suggests some sort of matter is keeping them compact. Galaxies form inconsistently in the Universe. According to scientists, the Universe should have a uniform shape since the Big Bang (see movie). Scientists believe that some dark matter which is cooler (possesses lesser kinetic energy) move at a much slower rate and thus form groups. Other matter than gather in these places where gravity is higher (greater mass) which eventually form galaxies. This also explains the dark matter which keeps stars together. Also, according to scientific research, the Universe seemed to have a uniformed amount of matter on its surface, which makes it look like a smooth ocean. This indicates that the total matter in the surface of Universe has critical density, which just means balanced density. Dark matter is believed to equal up the matter with its sheer numbers. Cosmology | Dark Matter | Big Bang | Other Tutorials
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