Answer :
The particles that we think exist in the cosmos but that we cannot directly observe have been given the label "dark matter" by physicists.
Because it was impossible for scientists to detect it by looking at the universe in any region of the electromagnetic spectrum, dark matter was initially referred to as "missing matter." This substance does not appear to absorb or emit any electromagnetic radiation, yet it does appear to have mass (and hence produce gravity).
Scientists are aware that dark matter, which accounts for about 80% of galaxies' total mass, does not emit light. This indicates that there is four times as much dark matter as normal matter.They found that the stars farther away from the center were moving much faster than predicted. The only way this is possible is if there is more mass in the outer parts of galaxies than we can observe. The fact that we are unable to see this mass, because it is not emitting light, suggests the presence of dark matter.
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