I see the claim that the etheric body is made of "pure" energy a lot and I have a way to test that assertion. If in fact, it is made up of energy, in the normal sense of the word, then it would be affected by gravity. For those who don't know, matter and energy are the same thing, and as such they are both affected by gravity in the same way. To see hard much mass is associated with a particular quantity of energy use the most famous equation in all of physics E=mc^2. (Yes, I do have a degree in physics). Now it is well known that no mass or energy can escape from a black hole, and they have recently been detected quite unambiguously. So all you need to do is project and go into a black hole. If your etheric body is trapped for until the universe collapses then indeed it is made of energy in the normal sense. If you can escape then in cannot be made up of energy but must be something else. Now if you think about it, it is quite a scary idea, having your etheric body being trapped for all eternity, so I would not volunteer for this experiment, any takers? Hehe. In all seriousness I think that the etheric body is not made of "pure" energy but rather something else not yet detected by scientific instruments and maybe never will be.