Excellent, that was a huge help! Now, I looked in the "data-final-fixes" file in the space exploration mod folder, but couldn't find anything matching the format for allowing entities in space. Are you referring to another file that references it, and saying to place the modified line just before that file is referenced? Which file exactly are you referring to when you say "before SE's data-final-fixes"? I know it may seem obvious to a seasoned modder, and I'll probably feel very silly when I finally figure it out, so please be patient as I ask questions.
Thanks again for your help!