It needs to be scaled down to fit on a page or a screen. Map scales can be written in two ways, a simple scale with units or a ratio scale. A map scale is given as 1 cm = 2 km. This means that ...

That's the point hammered in by this huge to-scale map of the solar system, If The Moon Were Only 1 Pixel, created by the interactive designer Josh Worth. The map is simple: it starts at the sun ...