# What is 1 light-year equal to in astronomical units?

## What is 1 light-year equal to in astronomical units?

63,241 astronomical units

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). A light-year equals about 9.46073 × 1012 km (5.87863 × 1012 miles), or 63,241 astronomical units.

## Is an astronomical unit the same as a light-year?

A light year is the distance light travels in a year. And an astronomical unit is the average distance between the earth and the sun. So the distance to the sun is by definition one AU.

**What is 1 ly equal to in astronomical units?**

Definitions

1 light-year | = 9460730472580800 metres (exactly) |
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≈ 9.461 petametres | |

≈ 9.461 trillion kilometres (5.879 trillion miles) | |

≈ 63241.077 astronomical units | |

≈ 0.306601 parsecs |

### How many light years are astronomical?

For general reference, there are 63,000 astronomical units in one light-year, and 63,360 inches (160,000 cm) in one mile (1.6 km). This wonderful coincidence enables us to bring the light-year down to Earth.

### Which is the unit of Parsec?

Parsec or parallactic second or is a unit of distance. It is defined as the distance at which one AU (astronomical unit) subtends an angle of one arc second, and is equal to 3.26 light years. Or, it is the unit of length which is used to measure the large distances of celestial bodies outside the solar system.

**How fast 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.

#### Is parsec a unit of Time?

Unfortunately, like the similarly misused ‘light-year’, the parsec is a unit of length, not of time. A parsec is equal to about 3.26 light-years or roughly 31 trillion kilometres (19 trillion miles). The unit has its origins in one of the first methods of determining the distance to the stars.