Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Extended structure of dark matter

  1. Feb 14, 2010 #1
    Since pure dark matter apparently does not have charge but has mass, might it be found in the galaxy's edge as something akin to uncharged black holes?

    Typically, pure dark matter is invoked as particles. Wouldn't they form aggregations under gravity?

    Extended (i.e., not particulate) dark matter, analogous to uncollapsed stars where electromagnetism is normally present, seems to me to be ruled out.

    This leaves conglomerates of dark and charged matter further to the imagination.
  2. jcsd
  3. Feb 15, 2010 #2


    User Avatar
    Science Advisor
    Gold Member

    Dark matter does not clump as does ordinary matter. When DM particles meet, they simply pass right through one another. Gravity causes DM to form extended, diffuse structures of relatively uniform density.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook