What is 3.2 light years equal to?

1 Answer
Feb 21, 2016

3 light years is approximately 2.84 times 10^13 km2.84×1013km, which is around 28400 billion kilometres!

Explanation:

Find seconds per year :
3600 text(seconds)/(hour) times 24 (hours)/(day) times 365 (days)/(year) = 31536000 text(seconds)/(year)3600secondshour×24hoursday×365daysyear=31536000secondsyear

In one year light travels the speed of light in meters per second, multipled by the time in seconds:
1 light year = c times text(seconds per year) = (3times10^8 ms^-1)(31536000 text(seconds)/(year)) =9.4608times10^15=c×seconds per year=(3×108ms1)(31536000secondsyear)=9.4608×1015 meters per year

3 light years =9.4608times10^15=9.4608×1015 meters per year times 3 years = 2.83824 times 10^16 m×3years=2.83824×1016m

3 light years is approximately 2.84 times 10^13 km2.84×1013km, which is 28400 billion kilometres!