A light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). It's a unit used to measure astronomical distances.

One light-year is equal to approximately 9.461 trillion meters (9,461,000,000,000 meters).

Astronomers use light-years because the distances in space are so vast that using meters would result in extremely large and unwieldy numbers.

25 light-years is equal to 236,525,000,000,000,000 meters.