Help Map Earth's Light Pollution from Space
Join the mission to classify images taken by astronauts aboard the ISS. Your contributions can help reduce light pollution and protect our night skies
All you need is a computer, a bit of curiosity, and a few minutes of your time.
Explore the images
Browse through amazing photographs of Earth taken from space at night.
Classify what you see
Help us identify cities, rural areas, or natural landscapes. Even small contributions make a big impact!
Submit your findings
Each image you classify brings us closer to mapping the world's light pollution accurately.
Your Contributions matter
Help researchers
better understand the impact of artificial lighting on the environment.
Contribute to science
without needing a background in astronomy or technology.
Discover new insights
about cities, landscapes, and remote areas as seen from space.
Cities at Night is a citizen science project where people like you can participate in classifying nighttime images of Earth taken from space. These images help us map light pollution across the globe, a growing problem that affects ecosystems, human health, and our view of the universe.
Numbers Speak For Themselves
Explore Earth’s Nighttime Wonders
Didactic Unit
CITIES AT NIGHT CITIZEN SCIENCE PROJECT TO LOCATE LIGHT POLLUTION SOURCES
This Didactic Unit reviews the basic lines of the Cities at Night project and highlights the potential of satellite images to locate sources of light pollution and follow its evolution over time.
Spanish
English
Germany
Portuguese
French
Collaborators
Cities at Night is thanks to the work of many volunteers. But also of scientists and researchers who lead the project.
Alejandro Sánchez de Miguel
Team Leader. Universidad Complutense de Madrid (UCM).
Jaime Zamorano
Astrophysics professor at Universidad Complutense de Madrid (UCM).
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