Darkness has become legible – and contested. Blending archival narrative with on-the-ground ethnography, Sara B. Pritchard traces how four fields – astronomy, remote sensing, conservation science, and ecology – have investigated artificial light at night, turning a ubiquitous convenience into a category of harm. From observatories chasing ever-receding darkness to the satellite images that first rendered a nocturnal planet from space and recent "Black Marble" maps, Pritchard shows how methods, instruments, and field sites shape what scientists can know about night and light – and what remains unseen.
Across these encounters, night emerges not as a backdrop but as an environment in its own right – one transformed by rapidly expanding, brightening illumination in the Anthropocene. The book chronicles the ascent of "light pollution", as well as the new challenge of space-based brightness from satellite constellations, even as dark-sky advocates fight to preserve the starry firmament. Attentive to politics as much as photons, Pritchard brings environmental justice to the fore – highlighting tensions among light poverty, forced illumination, and surveillance and calls for "beneficial darkness". She takes seriously Indigenous astronomers' critiques of dispossession and "astro-colonialism", asking what it means to site world-class telescopes on sacred land.
Sweeping from local parks to planetary vistas, Transforming Night reframes a familiar story of modern light as a history of changing nights – past, present, and possible. It will engage readers in environmental history and humanities, science and technology studies, and the sciences themselves, along with dark-sky activists and anyone drawn to the beauty and politics of the world after nightfall.
Sara B. Pritchard is an associate professor of science & technology studies at Cornell University. She is the author of Confluence: The Nature of Technology and the Remaking of the Rhone (Harvard, 2011), co-editor of New Natures: Joining Environmental History with Science and Technology Studies (Pittsburgh, 2013), and co-author of Technology and the Environment in History (Johns Hopkins, 2020).
Paul Sutter is the series editor for the Weyerhaeuser Environmental Books series. He is professor of history at the University of Colorado Boulder. He has published five books, including Driven Wild: How the Fight Against Automobiles Launched the Modern Wilderness Movement (UWP, 2005) and Let Us Now Praise Famous Gullies: Providence Canyon and the Soils of the South (Georgia, 2015).
"Transforming Night is an exemplary interdisciplinary study of light pollution and the nocturnal landscape. Sara Pritchard explains how researchers in astronomy, satellite-based remote sensing, conservation science, and ecology, for different reasons, all reconceived the night as an environment. Her innovative perspective raises urgent issues of environmental justice."
– David E. Nye, author of Electrifying America and American Illuminations