Distance in Light-Years Calculator
Astronomy & SpaceConvert a distance in kilometers into light-years.
Distance in Light-Years
The distance expressed in light-years, the distance light travels in one year.
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Frequently Asked Questions
What is a light-year?
A light-year is a unit of distance, not time — it is the distance light travels in one year, roughly 9.46 trillion kilometers, used because cosmic distances in kilometers or miles become unwieldy.
How far away is the nearest star to the Sun?
Proxima Centauri, the nearest star to our Sun, is about 4.24 light-years away — meaning light from it takes over four years to reach Earth.
Why do astronomers use light-years instead of kilometers?
Distances between stars and galaxies are so vast that kilometer figures become extremely long and hard to interpret — light-years provide an intuitive scale tied to the speed of light, a fixed physical constant.
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