Question

HOW DARK MATTER THEORY IS SUCCESSFULLY Explained BY SCIENCTIST​

Answer 1

$\huge\bold\red{ANSWER:-}$

Dark matter is just what its name implies; it is matter (or mass) in the universe that we cannot see directly using any of our telescopes. Our telescopes see not only visible radiation (constituting the spectrum of colors that our own eyes can detect), but other types of radiation as well.

Optical telescopes see only the bright galaxies in this composite image. But the ROSAT satellite reveals that they are surrounded by a cloud of hot gas that emits x-rays. This gas accounts for some of the rotational effects on galaxies not accounted for by the optical image.

Dark matter does not reveal its presence by emitting any type of electromagnetic radiation. It emits no infrared radiation, nor does it give off radio waves, ultraviolet radiation, X-rays or gamma rays. It is truly "dark." Cosmologists believe we can only see about 10 percent of the matter in the universe. Until they can accurately determine the mass of the universe, they will not know for sure whether it is expanding infinitely or will stop expanding at some point and collapse.

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