Biosignatures and Technosignatures: The Dual Frontier in the Search for Life and Intelligence

To the point

Researchers search for life beyond Earth in two broad categories—biosignatures, such as oxygen, ozone, water vapor, methane, and surface color changes indicating biology, and technosignatures, including radio or laser signals and megastructures like Dyson spheres—while acknowledging substantial uncertainties and false positives and guided by figures like Jill Tarter and Jason Wright through programs such as Breakthrough Listen.