a light year is 9.5*10^12 km. the diameter of the milky way galaxy is estimated to be 100,000 light years.
A) what is the diameter of the milky way im kilometers?
B) the speed of light is about 3*10^8 m/s. what is the speed of light in kilometers per hour?
C) about how many days would it take light to travel across the milky way?
D) about how many years would it take light to travel across the milky way?

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100,000 = 1 * 10^5 lighyears

so A is 1 * 10^5 * 9.5 * 10^12

thats 9.5*10^17 right? @welshfella

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