The light-year is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometres (9.46×1012 km) or 5.88 trillion miles (5.88×1012 mi). Astronomical units: 63241 au; 0.3066 pc Metric (SI) units: 9.4607×1015 m; 9.46075 Pm Imperial & US units: 5.8786×1012 mi
