I noticed this too and have been wondering about it. <BR>The conclusion that I came to was that Gandalf was just musing to Aragorn, even though he felt Frodo's presence his sense for him was weakened due to the lands in which he was traveling, he was just thinking out loud to Aragorn and when asked what he thinks, Gandalf immediatly says that, yes, he does believe Frodo is still living. Then later when Frodo has passed completely into Mordor Gandalf cannot sense him, maybe due to how dark and evil the place is.<BR>That's my theory anyhow...
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