How far is a light year?
Question: How far is a light year?
We know that the speed of light is 186,000 miles per second
as explained here:
How Fast is the Speed of Light?
A light year is defined as how fast light can travel in one year.
Total seconds in a year is 60 seconds x 60 minutes x 24 hours x 365 days =
31,536,000.
31,536,000 seconds x 186,000 miles = about 5,870 billion miles.
Thus, the answer to your question, "How far is a light year?" is about
5,870 billion miles.
How far?
Learn about the distances of other things. How far is that anyway?
Astronomy
Explore the universe!


How Fast is a Knot?
How Fast is a Knot? Find out how fast a knot really is!
Calculate
Helpful online calculators about all kinds of stuff.





