Other contributors have said "How many stars are in the Milky Way galaxy?" is the same question as "How many stars are in the milky way?" If you believe that these are not asking the same thing and should be answered differently, click here
This is estimated to be 100-400 billion stars. The reason this estimate is rather inaccurate is that it is hard to get a good estimate of the number of red dwarves - which make up the majority of the...