Hope for the future.
Ditto, pretty much summed it up for me. I know it's fictional and all but I think it shines light on where humans could go, it shows our best side in a world that is ugly.
On that same "hope" saying. it also depresses me. We live in a world where we cannot take care of our own planet, country, and in some extreme cases ourselves. How can we expect to explore other worlds when things are FAR from perfect in our own backyard?