Given that the Andromeda galaxy is about 163000 light years across and subtends about 4.1^@, approximately how many light years away is it?
1 Answer
Mar 28, 2017
Approximately
Explanation:
4.1^@ = 4.1*pi/180 ~~ 1/14 radians
So the approximate distance to Andromeda is:
163000*14 ~~ 2300000 light years