Describing light years

For most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it!

We use light-years to describe the distance of most objects in space. A light-year is the distance light travels in one year on Earth. One light-year is about 6 trillion miles (9 trillion km).

Explanation:

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