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  • Light-year - Wikipedia
    A light-year, alternatively spelled light year (ly or lyr[3]), 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 9 46 trillion kilometres or 5 88 trillion miles
  • What Is a Light-Year? | NASA Space Place – NASA Science for Kids
    A light-year is the distance light travels in one Earth year Learn about how we use light-years to measure the distance of objects in space
  • What Is a Light Year? Definition and Examples
    The light year or light-year (ly) is a unit of length that is the distance light travels in a vacuum in one Earth year One light year is exactly 9460730472580 8 km (approximately 9 46 trillion kilometers or 9 46 x 10 12 km), which is approximately 5 88 trillion miles
  • Light-year | Distance, Measurement, Time | Britannica
    Light-year, in astronomy, the distance traveled by light moving in a vacuum in the course of one year, at its accepted velocity of 299,792,458 metres per second (186,282 miles per second)
  • LIGHT-YEAR Definition Meaning - Merriam-Webster
    The meaning of LIGHT-YEAR is a unit of length in astronomy equal to the distance that light travels in one year in a vacuum or about 5 88 trillion miles (9 46 trillion kilometers)
  • What Is a Light-Year? Understanding Cosmic Distances
    A light-year is the distance light travels in a vacuum over the course of one year Multiply the speed of light by the number of seconds in a year, and you get the magic number: about 9 46 trillion kilometers, or roughly 5 88 trillion miles
  • What Is a Light Year? - Definition and Calculation Method
    A light year represents the maximum distance light travels through a vacuum over the period of one year While the concept might initially seem complex, a light year simply factors the constant speed of light with the time frame of 365 days
  • What Is a Light-year? - HowStuffWorks
    To measure really long distances and how fast light travels, astronomers and other scientists use a unit called a light-year To reach the previously mentioned Proxima Centauri, it'd take 4 25 years at light speed
  • Glossary term: Light Year - astro4edu. org
    Description: A light year is a unit of length sometimes used in astronomy to express large astronomical distances like distances to stars or between galaxies It is defined as the distance that light travels in vacuum in one year: 9 46 trillion kilometers (km), that is 9 5x10 12 km
  • What is a light-year? - Science@NASA
    What is a light-year? Light-year is the distance light travels in one year Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5 88 trillion miles (9 46 trillion kilometers) per year





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