
Nikon P1000 - Maximum Zoom Range Test (93 KM / 57 Miles)
8 inches per mile squared blows away the globe.
How about Mercury? 

Why not? It is exactly what is expected from the geometry of orbits. Remember, no air in space.
8 inches per mile squared blows away the globe.
Why? It is obvious, on a global earth, the higher your viewpoint, the farther you can see. The horizon expands as your view rises above the average surface.
