Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Light-year?
Summarize this article for a 10 year old
A light-year, alternatively spelled light year, (ly) is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km, which is approximately 5.88 trillion mi. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). Because it includes the word "year", the term is sometimes misinterpreted as a unit of time.
|Unit system||astronomy units|
|1 ly in ...||... is equal to ...|
|metric (SI) units|| 9.4607×1015 m|
|imperial and US units||5.8786×1012 mi|
|astronomical units|| 63241 au|
The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications. The unit most commonly used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry; it is the distance at which one astronomical unit (au) subtends an angle of one second of arc.
Oops something went wrong: