Gandalf, Moria, and Arrest

[Morthoron]

Originally Posted by Moonraker

The question remains unanswered. How did Aragorn foretell the imminent doom of a powerful Maiar? He had been to Moria before, but did he have any news of an ancient terror dwelling there?

Perhaps there is a perception problem here. I offered you the correct answer in my last reply, which you then quoted. Here, let me re-post it so that you may read it again. Several times if you'd like:

Foresight, providence and prescience are hallmarks of the books. The foretelling of dooms runs from the early 1st Age through the end of the 3rd Age, from the Dooms of Mandos all the way to Saruman's curse of Frodo. I suggest you read further.