Question

The distance from the earth to polaris is approximately 5.78 × 1018 m. the speed of light is 2.99792 × 108 m/s. if the north star polaris were to burn out today, in how many years would it disappear from our vision? answer in units of years.

Answer 1

              V = d/ t
t = v/d
-> 2.00 * 10 ^ 10 s
divide by 3600 and by 24 to get days
->232414 days

divide by no of days in a year
giving 636 years approx.