If you want a very good source for this, go to Astral Society, Astral Projection, Spiritual Discussion and Information Resources. I used to research this stuff, including telepathy and energy. I quit doing it, though, just because the OBE crap started freaking me out (e.g. when the vibrations start coming, it gets kind of scary for me). It's VERY interesting though, and it is very real. Remember, there are two types: etheric projection, and astral projection. Etheric projection is where you go out of your body, but you're still in between the Astral plane and the Physical plane--so you can see the physical still. The Astral plane is something completely different, and it exists at a much higher vibration frequency. Go read about it, and you'll understand.