Is it Reasonable to Assume our Galaxy is in a Steady State?

AI Thread Summary
The discussion centers on the assumption that the Milky Way Galaxy is in a steady state, supported by the fact that a typical disk star completes over thirty orbits in approximately 3×10^8 years. This orbital time frame suggests that the galaxy's dynamics have stabilized over extensive periods. Participants question whether significant changes might occur after the 31st revolution of a star. The conversation emphasizes the reliability of the steady-state assumption based on the long-term behavior of stars within the galaxy. Overall, the steady-state model appears reasonable given the evidence presented.
mmtwwla
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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."
 
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mmtwwla said:
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."

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

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