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# What is a light year exact measurement?

Updated: 9/25/2023

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Q: What is a light year exact measurement?
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### Are light-years stars?

No. A light-year is a measurement. A light year is a distance measurement based on how far light travels in a year.

### Which unit of measurement uses the distance light travels in one year - 9470000000000km?

The unit of measurement is the "light year".

"light-year"

### How many days make a light year?

A light year is a measurement of distance not of time.

light-year

### What is the exact speed measurement of light?

The speed of light in vacuum is 299,792,458 meters (186,282 miles) per second.

### How many years are in a 100 light years?

Years are a measurement of time; light years are a measurement of distance. A light year is the distance light travels in one year (in a vacuum).

### What is the exact measurement of 41.3 inches?

41.3 is an exact measurement.

### What is a measurement of distance based on the speed of light?

A unit that is commonly used in astronomy is the light-year - the distance light travels in a year.

### Why do astronomers use light year to measure time in space?

They don't. Light years are a distance measurement, not a time measurement.

### When do you use a light year?

You don't use it, it is a unit of measurement.

### When do you use a light-year?

You don't use it, it is a unit of measurement.