Light-year
01
光年, 光年
the distance that light travels in a year (about 9.46 trillion kilometers)
例子
Proxima Centauri, the closest star to Earth, is 4.24 light-years away.
比邻星，距离地球最近的恒星，位于4.24 光年之外。
The galaxy is roughly 100,000 light-years in diameter.
银河系的直径约为100,000 光年。
