![]() ![]() It is bound to our world by gravity only, and only tugs on other things that also possess gravity. That's because as far as anyone can tell, dark matter is extremely non-interacting: just as humans walk through a still room barely noticing the atmosphere that surrounds us, dark matter seems to barely ever touch, even faintly, the normal matter that it hovers around. ![]() So far, none of the efforts to figure out the nature of the particles that constitute dark matter have borne fruit. True to its name, dark matter is hard to directly observe yet astronomers are certain it exists because of the huge gravitational effect it has on galaxies and the stars that live within them. Dark matter makes up 27 percent of the universe's total mass and energy - nearly five times more than "normal" matter that comprises planets and stars. ![]()
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