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.

Aditi Chauhan , 11 Years ago

Grade 10