[Psionic Powers] Astral Projection and Space Travel

[nerdvana]

There's a line on p27 of GURPS: Psionic Powers that leaves much to extrapolation when applying those rules to a science fiction world...

Originally Posted by Psionic Powers

the outer plane only extends as far up as the atmosphere

...so, how does this interact with space travel? I see this question as having many parts that I would like to open for discussion (or additional questions added to obviously...). I am the GM for the game I am involved in so answers of "How ever your GM defines it" are unconstructive, instead I encourage you answer how you would do it (or canonically if the answers are coming from Rev P Kitty and/or Kromm).

1. If the outer plan only extends as far up as an atmosphere what happens when you astrally project in a space craft in space?
2. Additionally, what happens if you astrally project when on a planetoid that barely has any atmosphere to begin with?
3. Also, with the 'Inner Plane' (assumably the same for all outer planes), can you go from Earth's Outer Plane to the Inner Plane and then exit to the Outer Plane of another planet?

I see a lot of GM headaches here and I have a few answers to the concern that I'm considering for my game...

1. Dispose of Outer/Inner Planes entirely. Make the Astral Plane the Astral Plane. Sure there can be natives. They are from the Astral Plane. (see below)
2. Needing a reason why you can't astrally project outside of the atmosphere I have decided that astral space (aka "The Astral Plane" in the same sense that The Moon is a moon) is a byproduct of a biosphere. So a lifeless moon or the depths of space, you can't astrally project, there is nothing to project into outside of yourself. However, on a bioship or a ship with a sufficiently large enough biomass for O2 and other consumable production might have an astral space associated with it (which would intermingle with a planet's whenever it landed!).
3. Astral "natives" are byproducts of the biosphere also (be they spontanously created, the product of psi constructs gone wild, psis who survive death as astral entities or maybe even ghosts of mundanes who don't get what they are but still exist)
4. Because there is nothing there, if you were to attempt to astrally percieve when outside of a biosphere you might go insane (I'm working on the exact mechanics) because your mind is trying to make sense of nothingness and if you were to try to astrally project you might end up killing yourself!

Now, I'm still working on my "solution" but what do people think of it (and the "problem")?