Our sun, with mass 2 × 10 30 kg revolves on the edge of our milky way galaxy, which can be assumed to be spherical, having radius 10 20 m. Also assume that many stars, identical to our sun are uniformly distributed in the spherical milky way galaxy. If the time period of the sun is 10 15 second and number of stars in the galaxy are nearly 3 × 10
A
, find value of ‘a’ (take π 2 = 10, G = 
× 10 –11 in MKS)
× 10 –11 in MKS)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(11)
Sol. 
= m s ω 2 R
M = 
M = 6 × 10 41 kg
M = nm s
(6 × 10 41 ) = n (2 × 10 30 ) 
So, x = 11. Ans. 11
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