above is the info. from google.
if you were to calculate it from the info given.
answer to your part a in your calculator to reduce error.
One light-year is the distance light travels in a 365-day year. The speed of light is about 186,282.4 miles per second.
(a) How long is 1 light year in miles? Express your answer is scientific notation.
(b) Light from the North star takes 680 years to reach the earth. How many miles is the North star from earth?
This is the unit analysis. I've used the computer format such as "3e8" to represent numbers in scientific notation such as .
Years cancel out. So do s, hr, days, and meters. The only unit left is miles.Code:3e8 m 3600 s 24 hr 365 d mile 1 year * ----- * ------ * ----- * ----- * ------ s hr d year 1609 m