Love your sci-fi setting. Good job!

The setting is great. I love the idea of a collection of ships so massive they create their own gravity. 

I have my own confusion. It's 15 d10 per stat? Not 15 amongst four stats? If so, these are some hardy space-farers! Also, no long term goal? Possibly set by the GM, but assuming it's just survival against the aliens that consumed Sol is, well, less than exciting. Sounds drear and dire. Eh, that's survival for you.

I'm still a little uncertain how damage works. After the strength check do you take away the difference?

I like the theme :)