All images have been taken by astronauts from NASA, CSA-ASC, ESA, ROSCOSMOS and JAXA. You can find the original pictures on the website “Gateway to astronaut photography of Earth”:
The Cities at Night website content was developed entirely to be used for outreach and scientific research. Its content can be used for those purposes as long as a citation of the project is included.
Creative Commons License. Geo-referenced Cities at Night images from ISS by Alejandro Sánchez de Miguel et al. Atlas of astronaut photos of Earth at night A&G (2014) is distributed under Creative Commons Non commercial attribution – Share 4.0 International licence.