Atlas of astronaut photos of Earth at night
Astronauts have been taking photos of Earth for decades (Peit 2008), but the last few years have seen a dramaic increase in the quality of the imagery, paricularly at night. Nighime images oten have a large public resonance, perhaps because ariicial light at night is such a unique signature of human acivity on Earth (see e.g. Figure 1). While these beauiful pictures are freely available from a NASA repository (The Gateway to Astronaut Photography of Earth), the sheer number of photos can make inding, for example, an image of a paricular city at night a challenge. In many cases, considerable ime must be invested in order to ind the original data for an image popularised by an astronaut through twiter.