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Yes, pretty much by definition.

SOMETHING other than baryonic matter is causing two undeniable gravitational effects: (1) the radial velocities of stars in galaxies and (2) the bending of light as it travels through our Universe. Interestingly, the estimated ratio of this "something" to baryonic matter is about the same both within and outside of galaxies, meaning this "something" is about the same everywhere in our Universe.

Since this "something" has mass (ie, causes gravitational attraction) but seems to have almost no other interaction with baryonic matter, we call it "dark matter." That's a much easier description than "something out there that we don't understand beyond the fact that if has gravity."

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13y ago

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