Steady state of the Galaxy

  1. How can we make the assumption that the Galaxy is approximately in a steady state at the present time?
    I read this from the textbook:
    "the time required to complete one orbit at 10kpc is 3×108yr... a typical disk star has completed over thirty revolutions, and hence it is reasonable to assume that the Galaxy is approximately in a steady state at the present time."
     
  2. jcsd
  3. phinds

    phinds 8,470
    Gold Member

    So, do you think that on the 31st revolution things are going to go crazy?
     
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