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    Could it be that the dark matter doesn't exist and that there is a super massive rocku exoplanet out there that is responsible for the weird velocity of other stars?
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    No. I don't think you appreciate the orders of magnitude here!
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    (Original post by Alpha-Omega)
    Could it be that the dark matter doesn't exist and that there is a super massive rocku exoplanet out there that is responsible for the weird velocity of other stars?
    Dark matter is called dark because it doesn't interact via electromagnetism, only gravity. So in a sense, a very very very small % of dark matter is down to simply planets we can't see visibly. But VERY small, so much so that it's probably negligible. Dark matter is (we think) responsible for the behaviour of the rotation of galaxies, not just a few stars. The size of your hypothesised rocky planet would have to be immense, and even then there are a few more problems.
 
 
 
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