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 Alejandro Sanchez

Alejandro Sanchez

Postdoctoral Research Fellow


 Environment and Sustainability Institute 


Environment and Sustainability Institute, University of Exeter, Penryn Campus, Penryn, Cornwall, TR10 9FE, UK

Alejandro has been involved in light pollution issues since the mid 1990s and has contributed to over 100 articles and contributions to conferences many related to light pollution. He is the leader of “Cities at Night,” a citizen-supported project coordinated with NASA and other space agencies that uses ISS night imagery to raise light pollution awareness.  He earned his PhD from the Universidad Complutense de Madrid (UCM), with a thesis titled, “Spatial, Temporal and Spectral Variation of Light Pollution and its Sources: Methodology and Results.”

Alejandro is currently doing his postdoc research fellow at Environmental and Sustainability Institute of the University of Exeter and serves as a light pollution advisor to the Instituto de Astrofísica de Andalucía (IAA) newly created Office of Night Sky Quality.  He is an active member of several astronomy and light pollution-related organizations and research networks in Europe, including Cel Fosc (Spain’s association against light pollution) and Sociedad Española de Astronomía (SEA), Loss of the Night network (LoNNe) and STARS4ALL.

In 2014, Alejandro received an IDA Dark Sky Defender award for his leadership role in “Cities at Night” project.

Broad research specialisms:

Light pollution

Calibration of DSLR cameras



2015 PhD Astrophisics, Universidad Complutense de Madrid

2013 Degree in Physics, Universidad Complutense de Madrid

2008 MSs Astrophisics, Universidad Complutense de Madrid



Research interests

Light pollution


Citizen science

Remote sensing

Research projects

Cities at Night: Citizen science crowdsourcing program for the classification and georefenciation of the ISS nocturnal archive.

Mapping ecological risks from the colour spectrum of artifical nighttime lighting


Committee/panel activities

Board of directors of the International Dark Sky Association
Coordinator of the Project “Cities at Night”

Media Coverage

Please note the following video is in Spanish:

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