Our galaxy the Milky Way has a diameter of about 1•^10

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The stellar disk of the Milky Way Galaxy is approximately 100,000 light-years (9*1017 km) (6*1017 mi) in diameter, and is considered to be, on average, about 1,000 light-years (9*1015 km) thick. It is estimated to contain at least 200 billion stars and possibly up to 400 billion.