As sort of an Advent I am posting nighttime photos of cities from space - one photo each day of the month.
|Image from NASA's The Gateway to Astronaut Photography of Earth|
The two cities are a study in contrast in many ways - chief among them is how they choose to regulate (or not) light at night. Tucson has an effective outdoor lighting ordinance that has helped to limit light pollution even in the face of huge population growth. Phoenix? Not so much. In fact the glow from Phoenix can be seen from all of the astronomical research observatories in the state. :(