It might seem like a paradox from our perspective, but there is good possibility that like fish in water - our senses & instruments just haven't evolved to perceive and function out of water (off earth) A good possible explanation would be that the seemingly empty void of space is chalk full of dark matter scientists assume makes up 95% of the universe and our eyes can't see it like a dog can't see color, and this invisible matter might someday end up being a biological commodity to future beings that evolve from us just like fresh air is to our lungs.

The universe might look like a cerulean sky, we just haven't evolved to see it that way yet.