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The Orcs in Moria had been sent there from Dol Guldur. Aragorn was an expert on Orcs, hunted them, and may have entered the Mines as part of a scouting expedition to learn about their movements, either on his own or in cooperation with Lórien. After all, Lórien was an obvious target for an attack from either Dol Guldur or Moria or both simultaneously. Since we don’t know anything else about when Aragorn entered Moria before III 3019 or his reasons for going there, I would venture that this is the single most likely reason.
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