That image seems to be post-processed. Here are the actual graphics, with a high-resolution Earth texture pack (yes, I made this Hatsune Miku XR2 skin): For now, the default Orbiter has zero terrain. But the sole developer of the program (Martin Schweiger) plans to add terrain. It isn't procedurally generated, however, so the data (heightmap and textures) will probably be many gigabytes in size. There is in fact a procedural terrain generator add-on (Orulex), but it isn't always accurate. Since I had experience in Orbiter, I didn't need to learn how to get into orbit, rendezvous, and dock in KSP.