
#1
Oct1913, 01:59 PM

P: 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 3×10^{8}yr... 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." 


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