i have discovered a vergence in the force
in TPM, QGJ said something along those lines. To which, Mace Windu replied, "centered around a person?"
Ushgarak pointed out in another thread that we dont really know what a vergence is. What is everyones thoughts? The word vergence basically means a point where something focuses. obviously, we can see why that would apply to anakin, or any jedi for that matter. they are stong in the force, hence there is a vergence of the force around that person. i would speculate that mace's comment, "centered around a person?" implies that a vergence can be around objects as well. this could possibly explain why the cave on dagobah is strong with the dark side. it wouldnt be necessary for a sith to have died there, it simply would be a location where the dark side of the force was very strong. hence, yoda hid there to elude the emperor during the jedi perge. as to how obi-wan remained hidden, that is open to even more speculation...