In a bid to study light pollution, the Cities at Night project has compiled and analysed thousands of photos of major metropolises at night, taken from the International Space Station.
Working in conjunction with NASA, researchers discovered that the “source of the diffuse glow around cities visible from space” is produced by street lighting.
The images in the project’s gallery make for spectacular viewing, and we have selected several images of major international and local cities for your viewing pleasure.
South African cities
Rio de Janeiro