Astronomical Unit to Light Year Conversion
Convert between Astronomical Unit and Light Year quickly and accurately.
How to Convert Astronomical Unit to Light Year
Conversion Formula
Example
Convert 15 AU to ly:
Unit Information
Learn about the length units you're converting between
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
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 to Light Year Conversion Table
| Astronomical Unit [AU] | Light Year [ly] |
|---|---|
| 1 AU | 0.000016 ly |
| 10 AU | 0.000158 ly |
| 25 AU | 0.000395 ly |
| 50 AU | 0.000791 ly |
| 100 AU | 0.001581 ly |
| 0 AU | 0E+0 ly |
| -10 AU | -0.000158 ly |
| -40 AU | -0.000633 ly |
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