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

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SUMMARY

The discussion centers on the assumption that the Milky Way Galaxy is in a steady state, supported by the textbook statement that a typical disk star completes over thirty revolutions in approximately 3×108 years at a distance of 10 kpc. This implies that the dynamic processes within the Galaxy are stable over such extensive timescales. Participants question the validity of this assumption, particularly regarding potential changes that might occur after numerous revolutions.

PREREQUISITES
  • Understanding of Galactic dynamics
  • Familiarity with orbital mechanics
  • Knowledge of stellar evolution
  • Basic concepts of astronomical distances (e.g., kiloparsecs)
NEXT STEPS
  • Research the implications of Galactic dynamics on star formation rates
  • Explore the concept of steady state in astrophysics
  • Investigate the effects of gravitational interactions in galactic structures
  • Study the lifecycle of disk stars in the Milky Way
USEFUL FOR

Astronomers, astrophysicists, and students of cosmology interested in the stability of galactic structures and the dynamics of star systems.

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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