10 to the 20th power

Question

The radius of the milly way is 3.9 x 10 to the 20th power. What is the diameter?

Answer 1

Hello, thank you for taking the time to post your question!

The underlying relationship that you want to use here is that

Diameter = 2 * Radius

So if Radius = 3.9 x 10^20, that means that the Diameter would be

Diameter = 2 * (3.9 x 10^20) = 7.8 x 10^20

I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)

Answer 2

d=2r
~~~~~~~~~~
Diameter of Milky Way is 2 · 3.9×10²⁰ = 7.8×10²⁰