Scientists first began to suspect the presence of some unknown type of matter in the 1930s when observations suggested that galaxies in clusters behaved as though the gravity pulling them was stronger than could be accounted for by the amount of matter the scientists could see. ![]() Currently, the only clues it gives us are through the gravitational pull it exerts on the normal mass that makes up the objects we can see, like stars and planets-and us. ![]() Neither electricity nor magnetism affect it. True, it can't shine by its own light, like hot coals, or even reflect light, like clouds or water. ![]() Dark matter, which makes up about 85% of the mass in the Universe, is more than simply dark.
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