How big is our galaxy?
1 Answer
Apr 21, 2016
As of now, the estimates are: Ir is about 130 K light years (ly) across, with a bulge of a few thousands of ly, at the center.
Explanation:
Sun is at about 27 K ly, from the center of our galaxy Milky Way (MW). Sun's period of revolution, along with its constituent orbiters, about the MW center, is estimated as about 250 million years. So, for these 2-sd approximations, the speed of the Sun is about 0.00068 ly/year = 14 AU./year = 66 km/s, nearly .
