Question

A light year is defined as the distance light travels in one year. One light year is 9. 46 x 10^12 kilometers. A galaxy is about 150. 000 light years wide. About how many kilometers wide is the galaxy?

Answer 1

Answer: One way to solve this problem is to multiply the distance of one light year by the width of the galaxy:

distance of galaxy = 150,000 light years x 9.46 x 10^12 km/light year

Using a calculator, we can evaluate this expression as:

distance of galaxy = 1.419 x 10^18 km

Therefore, the galaxy is about 1.419 x 10^18 kilometers wide.

Explanation: