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good question,
I'll do my best to reply using tech approach, because it can be answered on different levels (of approach)

---let's go---

Yes, mental body it's a body (formed) by...

I would like to add some tech approach, regarding (new age) concept of "Parallel Universe" (two worlds as two towns with a road between) because I think it's different "to leave one place and arrive...

sorry, but it's not that way .. (don't worth to re-invent the wheel)

please check about a cube view from a 4D perspective, so called Hypercube:
(what 3D has of plastic, in 4D has of elastic,...

please, let me try to explain more better now the "primary source of info", using the diagram of levels above from my previous post:

---

Earth (crust) - zero point
earth physical - 1nd
lowest...

well,
eigth levels where the two first levels can get very little information, virtually becomes seven levels.

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Theosophy books are based on (classic) 1895 Publication:

THE ASTRAL PLANE,...