From the original script:
222 INT. POLIS MASSA-OBSERVATION DOME-NIGHT
On the isolated asteroid of Polis Massa, YODA meditates.
YODA: Failed to stop the Sith Lord, I have. Still much to learn, there is ...
QUI -GON: (V.O.) Patience. You will have time. I did not. When I became one with the Force I made a great discovery. With my training, you will be able to merge with the Force at will. Your physical self will fade away, but you will still retain your consciousness. You will become more powerful than any Sith.
YODA: Eternal consciousness.
QUI-GON: (V.O.) The ability to defy oblivion can be achieved, but only for oneself. It was accomplished by a Shaman of the Whills. It is a state acquired through compassion, not greed.
YODA: . . . to become one with the Force, and influence still have . . . A power greater than all, it is.
QUI-GON: (V.O.) You will learn to let go of everything. No attachment, no thought of self. No physical self.
YODA: A great Jedi Master, you have become, Qui-Gon Jinn. Your apprentice I gratefully become.
YODA thinks about this for a minute, then BAIL ORGANA enters the room and breaks his meditation.
BAIL ORGANA: Excuse me, Master Yoda. Obi-Wan Kenobi has made contact.
--- That may sort of hint at the whole force ghost... but what isn't answered.. and someone who understands, please explain: How did Qui-Gon figure this out... and why didn't he disappear.. didn't other jedi who died even in the clone wars geonosis battle scene disappear? And then how did Anakin figure this out?
CAN OF WORMS>>>> "NOOOOO!"