The Astral Plane Theory. The Astral Plane Theory is a theory where basically, you manifest your own afterlife. As humans we are right now we can only comprehend three dimensions. When you die if you believe in the Astral Plane Theoretically you will be in your own afterlife. When you die you have energy in your body that has to go somewhere and after you die you can travel the universe or be on earth like you like it. Once you die you can now comprehend all of the dimensions and not only three. Some dimension out there this is all rainbows and unicorns, It's all about how you look at it.