The Copernicus Sentinel-2B satellite takes us over Kyoto, shown in the top right, and Osaka, seen in the bottom left of this image. This striking false-colour image captures two of Japan’s larger cities, which are home to 1.5 and 2.7 million people, respectively. Both are, of course, significantly smaller than the capital. Greater Tokyo has a population of around 38 million, making it the largest megacity in the world.