11 Is the Milky Way a spiral galaxy?

Yes            

12 How many stars does the Milky Way have?

100-400 billion

13 Is the Milky Way a barred spiral galaxy?

Yes

14 How old is the Milky Way?

13.51 billion years

15 What is the center of the Milky Way galaxy called?

Galactic Centre

16 What type of galaxy is the Milky Way?

Barred Spiral Galaxy

17 What is the name of region in space occupied by Milky Way?

Galactic Plane

18 How often our Sun complete its one round trip about the center of Milky Way galaxy?

Once in 225 million years