What Aster saw through the windows of the captain's cabin was a limitless red tunnel, which surrounded a smaller white tunnel, even without using spirit sense there was an obvious difference in the two tunnels besides the color of course.
The red tunnel was like a raging sea, if the spirit energy that floated in the outer space was chaotic, the one in the red part of the tunnel was on another level, Aster didn't doubt that this spaceship wouldn't last even one hour if they were to fall into that red current.
As for the white tunnel it was still not apt for anyone below the mortal transcending realm to circulate without a spaceship, but it was about the same level of the outer space, also judging by the runes that floated all over the place, it wasn't natural but manmade.