BACK TO astronomical unit
astronomical unit vs. light-year
- a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). Abbreviation: AU
[ lahyt-yeer, -yeer ]
- the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km): used as a unit in measuring stellar distances. Abbreviation: lt-yr
- a very great distance, especially in development or progress: The new computer is light-years ahead of the old one.
- a very long time: It's been light-years since I've seen my childhood friends.