As with most things, not everybody, even considering only those that believe in the supernatural, believes in or agrees on the idea of the Astral Plane.  Through out the ages, many religious and philosophical thinkers have weighed in on the topic, including Plato and Aristotle.  It is a popular topic among esoteric sects and the mystery religions.  The topic would be considered taboo and likely incorrect from a Christian perspective.  The idea doesn't appear to have a single origin since there are many different flavors of the theory.  Does this answer your question?  What else can I help you with?
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