[Doctor Stochastic]

If nothing else there is that three degree microwave radiation everywhere.

It's full of gravity, too.

[freedumb2003]

It's full of gravity, too.

You can tap into it via gravity wells. But don't get caught. The Force Police are almost as bad as the Time Cops.

[RightWhale]

Indeed, and gravity is even harder to screen than is EM radiation. There might be a region inside a perfectly uniform sphere where gravity is zero, but very few perfectly uniform spheres (in a uniformly gravity free space environment yet) have been discovered in nature.