You never know what will make a difference. That's why you should always always ALWAYS research and do the math.
Space makes things easy. Everything are a few simple equations away.
You don't need to agonize over whether or not an orbiting screw will smash through someone's head.
All you need to do is plug in the numbers into
Kinetic Energy = Mass Times Velocity Squared.
(It comes out to roughly the energy of a hand grenade. So yes. Yes, it would kill you).
There are other things that are squishy and harder to research and write. Which only makes researching them MORE important, so you can do your best.
That's my biggest fear that I'm going to write this book and just completely fuck up my depiction of PTSD...