A light-week is a unit of length useful in astronomy, telecommunications, and relativistic physics. It is defined as the distance that light travels in free space in one week (or light-seconds), and is equal to 8.1314478610000021.3144786100000093.1447861000000331.44786100000055744.4786100000055744.7861000000266367.8610000004991898.6100000143051156.100000023841858×10 m. It is just over ×10 miles and approximately 5.95×1014 feet.