Light Year (ly)
Definition: A light-year (ly) is the distance light travels in one Julian year (365.25 days), approximately 9.461 trillion kilometers or 5.878 trillion miles. It is used for measuring astronomical distances.
History: The term 'light-year' was first introduced in the 19th century to help astronomers express cosmic distances. It replaced astronomical units that were cumbersome for measuring vast space distances.
Current Use: Light-years are used in astronomy to describe distances between stars, galaxies, and other celestial objects. It is crucial for understanding the scale of the universe and cosmic events.
Mile (mi)
Definition: A mile (mi) is an imperial unit of length equal to 1,609.344 meters. It is commonly used in the United States and the United Kingdom for measuring road distances and geographical locations.
History: The mile originated from the Roman 'mille passus,' meaning 'a thousand paces.' It has varied historically, but the modern statute mile was standardized in the 16th century by Queen Elizabeth I.
Current Use: Miles remain prevalent in the US and UK for road distances, running races (e.g., the mile run), and aviation. Despite metrication efforts, it continues to be used in daily life and official measurements.
Quick Conversion Table Light Year (ly) to Mile (mi)
1 Light Year (ly) equal to 5.87850e+12 Mile (mi)
5 Light Year (ly) equal to 2.93925e+13 Mile (mi)
10 Light Year (ly) equal to 5.87850e+13 Mile (mi)
20 Light Year (ly) equal to 1.17570e+14 Mile (mi)
30 Light Year (ly) equal to 1.76355e+14 Mile (mi)
50 Light Year (ly) equal to 2.93925e+14 Mile (mi)
75 Light Year (ly) equal to 4.40887e+14 Mile (mi)
100 Light Year (ly) equal to 5.87850e+14 Mile (mi)