[Dather12]

I believe in the astrals it's far less dense than the physical, and as such we're far more flexible there than here. I believe that the same rules apply to all of these planes but in here, you need far more focus and mental power to really manifest like that.

Take the gravity situation: "Gravity" is so ubiquitous in our minds that it indeed is embedded deep within the subconscious and therefore incredibly hard to eliminate that belief. In the astrals though it's far less dense and in many areas there is no thick subconscious fog telling you what you can and can't do.