Light Year to Astronomical Unit Conversion
Convert between Light Year and Astronomical Unit quickly and accurately.
How to Convert Light Year to Astronomical Unit
Conversion Formula
Example
Convert 15 ly to AU:
Unit Information
Learn about the length units you're converting between
Light Year
ly
Definition
A light-year (symbol: ly) is a unit of length used in astronomy, equal to the distance that light travels in one year in a vacuum. It is approximately 9.46 trillion kilometers (5.88 trillion miles). This unit is used for measuring distances to stars and galaxies.
History/Origin
The light-year was first proposed in the 19th century as a way to express the vast distances in space. The concept became important with the development of stellar astronomy and the realization of the enormous distances to stars. The modern value is based on the speed of light in a vacuum.
Current Use
Light-years are used in astronomy for measuring distances to stars, galaxies, and other celestial objects. They are essential for understanding the scale of the universe, stellar evolution, and cosmology. The unit helps astronomers communicate about cosmic distances in a more intuitive way.
Multiplier
9E+15
Offset
0
Astronomical Unit
AU
Definition
An astronomical unit (symbol: AU) is a unit of length used in astronomy, equal to the average distance between Earth and the Sun. It is approximately 149.6 million kilometers (93 million miles). The AU is the standard unit for measuring distances within the solar system.
History/Origin
The astronomical unit was first estimated by ancient astronomers using observations of planetary positions. The modern value was determined through radar measurements of Venus and Mercury in the 1960s. It was redefined in 2012 to be exactly 149,597,870,700 meters.
Current Use
The astronomical unit is used throughout astronomy for measuring distances within the solar system, planetary orbits, and spacecraft trajectories. It is essential for space mission planning, planetary science, and understanding the scale of our solar system.
Multiplier
149597870691
Offset
0
Light Year to Astronomical Unit Conversion Table
| Light Year [ly] | Astronomical Unit [AU] |
|---|---|
| 1 ly | 63241.077088 AU |
| 10 ly | 632410.7708810001 AU |
| 25 ly | 1581026.927202 AU |
| 50 ly | 3162053.8544029999 AU |
| 100 ly | 6324107.708807 AU |
| 0 ly | 0E+0 AU |
| -10 ly | -632410.7708810001 AU |
| -40 ly | -2529643.0835230001 AU |
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