Space LDs are some of my favorites and I've experienced a couple different kinds.

A few nights ago when I was entering into the paralysis sleep state, the 'tunnel' into the dream state was space/stars (like a vortex affect).

The time before I quickly zoomed from ground level through a few different levels of atmosphere into space (just stars, no planets). Very calming and exciting at the same time. There I found myself with a person or guide who said I should question reality, and I reached out and what I thought was the universe was actually a wall of 'goo' (not unlike in the movie "Contact".)