When We Find Life: Science, Society, and Survival

At a GlanceThe SETI Post-Detection white paper outlines how science, policy, and society could respond to confirmed extraterrestrial life.Professor Martin Dominik warns that detection is a matter of when, not if, and preparation is vital.AI and new telescopes expand the search for technosignatures and biosignatures.Communication must stay transparent and collaborative as evidence builds.The SETI Post-Detection Hub tests global response scenarios to guide policy.International cooperation is essential so that any discovery benefits all humanity.

On this episode of SETI Live, planetary astronomer Dr. Franck Marchis hosts Dr. Martin Dominik of the University of St Andrews to examine what happens after the detection of life beyond Earth. Professor Dominik is a physicist and astronomer and a co-author of the recent white paper SETI Post-Detection: Future Directions for Technosignature Research and Readiness. The discussion focuses on how scientists, governments, and the public can prepare for the confirmation of extraterrestrial life — a discovery that could profoundly reshape human society.

Why Planning for Post-Detection Matters

Professor Dominik emphasizes that the question is not if but when humanity encounters evidence of life elsewhere. He notes that science already faces frequent claims of life beyond Earth that later prove unfounded. Developing strategies for both confirmed detections and false positives is therefore critical.

Detection methods are evolving. Advances in AI and increased computing power allow researchers to analyze vast datasets from radio telescopes and optical surveys with unprecedented sensitivity. These tools will enable the search for technosignatures and biosignatures, which are chemical or physical evidence of biological processes.

Expanding the Definition of Life

The white paper calls for a shift away from an anthropocentric perspective. Scientists must consider forms of intelligence and life that may not resemble terrestrial biology. Professor Dominik highlights the concept of “other minds,” which examines non-human intelligence on Earth, such as whales, to broaden the framework for recognizing alien life.

Fundamentally, he argues, any living system requires inheritance, a mechanism for transmitting information. Whether chemical or not, such a system would display a code of communication analogous to language. Understanding this principle guides the search for signals that convey information, whether they originate from a biological organism or not.

Communicating a Discovery

Clear, accurate communication is essential once a detection occurs. Professor Dominik warns that the discovery of life will rarely be a single, decisive event. Instead, evidence will accumulate, and scientists must explain how each step advances knowledge while acknowledging remaining uncertainties.

He emphasizes the importance of dialogue over one-way announcements. Public concerns and questions must be addressed directly, and communication should avoid exaggeration or premature conclusions. Lessons from the COVID-19 pandemic, where inconsistent messaging fueled misinformation, demonstrate the need for transparency and engagement.

The SETI Post-Detection Hub

To coordinate these efforts, the University of St Andrews established the SETI Post-Detection Hub. This international collaboration brings together researchers from the natural sciences, social sciences, and policy. The Hub develops toolkits to simulate detection scenarios and test responses across cultures.

These simulations reveal how reactions vary across different regions and communities. Insights gained from such exercises can help refine communication strategies and anticipate challenges, ranging from geopolitical tensions to the spread of misinformation through social media.

Anticipating Societal Impact

Confirmation of extraterrestrial life will not produce a single global reaction. Some communities may see the discovery as unifying, while others may experience division or fear. Historical precedents suggest that such discoveries have profound effects on human perspective. For example, the first images of Earth from space inspired modern environmental movements by highlighting the planet’s fragility.

Professor Dominik cautions that social media echo chambers amplify misinformation and political manipulation. Algorithms that reinforce existing preferences hinder exposure to diverse viewpoints, complicating efforts to share accurate scientific information.

Because any discovery belongs to all humanity, Professor Dominik advocates for international governance guided by the Outer Space Treaty and the Universal Declaration of Human Rights, which call for space exploration to benefit all nations. He stresses that no single country should claim authority over a detection. Instead, global institutions such as the United Nations must coordinate responses and ensure transparency.

Next Steps in Research and Policy

The white paper outlines priorities for future work:

Broaden international participation, including researchers from China, India, and Africa
Develop unified policy frameworks for global science communication
Conduct more scenario-based exercises with diverse communities to refine post-detection strategies

Projects like A Sign in Space, an international experiment that simulated receiving and decoding an extraterrestrial message, demonstrate the complexity of interpretation, even when the signal originates from humans. Such initiatives highlight the decades of effort that a real alien transmission might require.