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The Sun, which is 2.2  1020 m from the center of the Milky Way galaxy, revolves around that center once every 2.5  108 years. Assuming each star in the Galaxy has a mass equal to the Sun’s mass of 2.0  1030 kg, the stars are distributed uniformly in a sphere about the galactic center, and the Sun is at the edge of that sphere, estimate the number of stars in the Galaxy.


 The Sun, which is 2.2  1020 m from the center

of the Milky Way galaxy, revolves around that center once every
2.5  108 years. Assuming each star in the Galaxy has a mass equal
to the Sun’s mass of 2.0  1030 kg, the stars are distributed uniformly
in a sphere about the galactic center, and the Sun is at the
edge of that sphere, estimate the number of stars in the Galaxy.


Grade:10

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