Why is the unit 'light year' used to measure distances between celestial objects?

Explanation

To understand why the unit 'light year' is used to measure distances between celestial objects, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Definition of a Light Year**:
A light year is defined as the distance that light travels in one year. Light moves at a speed of approximately 299,792 kilometers per second (or about 186,282 miles per second).

2. **Distance of Celestial Objects**:
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