Yup, that's it, very nice. The magnetic field or forcefield of the death star hanger which keeps the atmosphere inside the hanger. Slyfox was right about the second pic I posted but that was only meant to be a hint So I guess it's Talon's turn (?)
Sorry guys, I've been quite busy this week, especially the last couple days and the next day or two, so could someone else post a pic in the meantime? I think Talon should go for it, and if you'll let me, I'll put one up in a couple days.