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Earth's core cannot be filled with any significant dark matter I think because we know its composition and the calculated weight matches well with the gravity w
by letitgo12345 11y ago
Earth's core cannot be filled with any significant dark matter I think because we know its composition and the calculated weight matches well with the gravity we experience.
Dark matter doesn't collide w/ other non-dark particles usually so it cannot lose momentum so any dark matter would just pass through Earth.
- darkmighty 11y agoCorrect, Earth formed through accretion of a disk -- all which happen due to friction. If you have no friction and the velocities of particles are isotropic, then you should get something like a uniform cloud of particles (instead of a protoplanetary disk, which later condenses in planets). I guess the same dynamics apply on the scale of galaxies, which should explain the violation of the expected rotation curve. It should still be possible that those weakly interacting particles would be captured by some body; if there is enough material (plus some other assumptions?) however, they should behave more like a almost uniform fluid (and not lumps like moons or planets), making it undetectable at small scales. It'll be interesting to see how this hypothesis pans out.
- simcop2387 11y agoVery good point I hadn't thought of that. That'll teach me to try thinking hard about something after a long work day.