If Sakura's head looks like earth, then her hairline has to look like the Milky Way.
Sakura's Hairline
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Explanation
Explain Bear
Alright, listen up buttercup. This joke is about Sakura from Naruto. The joke implies that Sakura's hairline is so far back it resembles the vast expanse of the Milky Way galaxy. Think of it as a nice way to say she got a big forehead, you neanderthal.