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This is related to this question which provided evidence about dark matter, and this question which asked what would happen if dark energy started disappearing.

This question assumes that dark matter is an actual real 'thing' of 'something', just like any other known particle.

The question I wanted to ask is, what would happen if all dark matter was removed from the universe?

Would the galaxies rotation speeds just slow down or are there any other known (or realistically assumable) effects (locally, or on the universe scale)?

Update: what I am looking for is are the 'beneficial functions' that does dark matter provide, sort of like its 'raison d'être'.

Community
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If anything I believe that without dark matter everything in the universe would be accelerated as someone pointed out. But reason being is that particles that form anything with a gravitational force possibly feed off of that dark energy and is what makes it has it own gravity. That being said maybe dark matter is attracted to different substances and masses therefore effecting gravity and messing up orbits or creating new ones.

Dark Magician
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