Let us assume that our galaxy consists of $$2.5\times 10^{11}$$ stars each of one solar mass. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution ? Taken the diameter of the Milky way to be $$10^{5}$$ ly.
The Milky Way is approximately 100,000 light-years in diameter. Our solar system is 26,000 light-years from the center of the Galaxy. All objects in the Galaxy revolve around the Galaxy's center. It takes 250 million years for our Sun to pull us through one revolution around the center of the Milky Way.
This artist’s concept shows the region of the Milky Way Roman’s galactic bulge time-domain survey will cover. The higher density of stars in this direction will yield more than 50,000
The Sun revolves completely around the galactic center in about 225 million years (a galactic year). The mass of the Galaxy can be determined by measuring the orbital velocities of stars and interstellar matter. The total mass of the Galaxy is about 2 ×1012 2 × 10 12 MSun M Sun. As much as 95% of this mass consists of dark matter that emits
Like the sun, the stars rise in the east and set in the west, due to Earth’s rotation or spin on its axis. So you can see the Milky Way tonight if you stay up until late night – say, around
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milky way revolution time
