Light travels through vacuum at a speed of approximately 186,000 miles per second. The distance of the sun from earth is approximately 93,000,000 miles. Thus it takes minutes for light to travel from the sun to earth. Proxima Centauri, the closest known star other than the Sun, has a distance of approximately $2.5 \times 10^{13}$ miles. It takes sun light years to reach Proxima Centauri. (Assume that a year has 365.25 days.)
Hint: Distance = speed times time. There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365.25 days in a year. Use scientific notation, e.g., $$2.5\times10^{13} = 2.5E13.$$