What is the standard unit for measuring intergalactic distances, like the distance to Andromeda ($ ext{0.78 Mpc}$)?
Answer
Megaparsec ($ ext{Mpc}$)
The Megaparsec ($ ext{Mpc}$), defined as $1,000,000 ext{ pc}$, is the standard unit for discussing intergalactic distances.
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