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willun t1_j81up2b wrote

Reply to comment by Cheshire-Kate in Why is the Oort cloud spherical? by Outliver

Would the dark matter provide drag? I wonder what the movements of dark matter would be in galaxies like that. I assume for the Milky Way it just rotates in line with the movement of stars (or more accurately, the stars move in line with the dark matter)

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gladfelter t1_j82x2uy wrote

The electrical field of an atom is many orders of magnitude larger than the radius of a theoretical WIMP. So interactions and friction would be orders of magnitude less for dark matter.

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willun t1_j82xgoa wrote

Not drag from friction, but gravity is what i meant. The same effect that causes the moon to face earth.

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SkoomaDentist t1_j864qop wrote

> Would the dark matter provide drag?

The way it was explained to me, dark matter only interacts via gravity, including on itself.

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