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Why are parsecs used rather than A.U.?

Answer 1

Because at our time we are not only describing and knowing the distance of objects within our Solar System. Parsec has a bigger value than AU.

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Answer 2

Alexander Acosta

In astronomy, parsecs are used as a convenient unit of measurement for large distances, especially when discussing the distances between stars and galaxies. One parsec is equivalent to approximately 3.26 light-years or 30.86 trillion kilometers. Astronomers prefer to express distances in parsecs rather than astronomical units (A.U.), which are primarily used for measurements within our solar system.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.