Why is studying the SPA basin's ejecta blanket particularly valuable for understanding the Moon's internal structure?

Answer

It allows scientists to indirectly sample the Moon's deep plumbing system.

Because the impact excavated material from such great depths, the ejected rocks are believed to contain material originating from the deep lunar interior, which is otherwise inaccessible.

Why is studying the SPA basin's ejecta blanket particularly valuable for understanding the Moon's internal structure?
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