Question

Studies of the relationship of the Sun to our galaxy-the Milky Way-have revealed that the Sun is located near the outer edge of the galactic disc, about 3000ly (1ly = 9.46 × 10¹⁵ ) from the center. The Sun has an orbital speed of approximately 250km / s around the galactic center. (c) Suppose the galaxy is made mostly of stars of which the Sun is typical. What is the order of magnitude of the number of stars in the Milky Way?

Answer 1

This progressing recycling keeps galaxies from purging their "fuel tanks" and so extends out their star-forming age to over 10 billion a long time.

         

Will galactic recycling last forever?

We know they are currently surrounded by a much larger, but nearly imperceptible cloud of dust and gas. The circumgalactic medium, or CGM, is what astronomers call it. The CGM functions as a massive recycling plant, collecting matter ejected by the galaxy and then reintroducing it.

This ongoing recycling prevents galaxies from emptying their "fuel tanks," extending their star-forming age to more than 10 billion years. However, universes that cause a rapid firestorm of star birth can exhaust their remaining fuel, effectively shutting down advance star-birth activity.

No of stars in Milky way:

 N= $\frac{M_{mw}}{M_{s}}$

 N=$\frac {2.7\times10^{41} kg} {1.989\times10^{30} kg}$

 N= $1.4\times10^{11}$

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