Area of Our Galaxy
Our galaxy has a diameter of 100,000 to 120,000 light years.
A light year is just a bit less than 5.87 trillion miles.
So using the lower figure of the estimate, the diameter of our galaxy is about than 587 quadrillion miles (5.9 x 10¹⁷).
Its radius is half that, or about 2.95 x 10¹⁷ miles.
Applying the formula for determining area from radius (area = Πr²) gives the following:
3.14 x 2.95 x 2.95 x 10¹⁷ x 10¹⁷ =
27.3 x 10³⁴ =
2.73 x 10³⁵