Ask Ethan: Could dark matter be "normal stuff" we can't see?

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Ask Ethan: Could dark matter be "normal stuff" we can't see?

Out there in the Universe, our cosmic inventory is divided up into two categories: normal stuff, which includes all the known, discovered particles of the Standard Model and everything they compose, and dark stuff, which appears to come in the forms of dark matter, which clumps and gravitates, and dark energy, which dominates the expansion of the Universe. While normal matter makes up all the things we’ve ever directly detected and interacted w…