Author Image: Lisa M. Krieger

Lisa M. Krieger

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fire photo
A schematic of the Milky Way Galaxy showing the electromagnetic radiation emitted by technological civilizations that formed in succession. Each civilization emits radiation during a lifetime. The full circle represents a civilization that is still emitting radiation. The other three civilizations with larger outer circles started emitting radiation longer ago and have since died and ceased emitting, leaving holes in their centers. - Geoff Marcy, UC Berkeley and Claudio Grimaldi, Ecole Polytechnique Fédérale de Lausanne