Why are different units of measurement used for distances in space?

Answer 2: The solar system is enormous, and interstellar space is even bigger. One astronomical unit is equal to 150 million kilometers. This makes it much easier to count the distances if they're in counts of Astronomic Units instead of having to count everything in millions or billions of kilometers

Explanation:

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it's unlikely a majority of a large population would agree on issues

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.