It was curved. His eyes widen. He backs the navicomp up as far as it will go. The entire Galaxy is visible in the hologram. It was a sphere.
Spheres have centers.
The trip to its heart was safe. More than safe. It was uneventful. The pitiful fragments of knowledge I'd gathered chased themselves around and around in my head until I resorted to suspended animation to be rid of them at last. Three months passed and then I arrived at the center.