An artist's impression of a Dyson sphere, a proposed extraterrestrial superstructure that is the focus of SETI surveys. The discovery of such a structure would be considered a "first contact" scenario. Credit: Breakthrough Listen / Daniel Putslaar

An artist's impression of a Dyson sphere, a proposed extraterrestrial superstructure that is the focus of SETI surveys. The discovery of such a structure would be considered a "first contact" scenario. Credit: Breakthrough Listen / Daniel Putslaar

An artist's impression of a Dyson sphere, a proposed extraterrestrial superstructure that is the focus of SETI surveys. The discovery of such a structure would be considered a "first contact" scenario. Credit: Breakthrough Listen / Daniel Putslaar