![]() (The photo at the top of this article is a composite image from optical and x-ray telescopes where the blue shading depicts the likely dark matter, even though it doesn’t show up directly in the images.)īroadly, we can measure matter and energy in the universe by observing it in one of four interactions: “The big thing about it is that we can’t see it it doesn’t interact with light,” says Ethan Brown, an Assistant Professor of Physics at Rensselaer Polytechnic Institute. “Everything you can see, everything you feel, everything you’re made up of, only makes up 5 percent of the universe, and the rest is this dark stuff.”
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