Imagine tomorrow’s headline: a telescope has found something unusual. You want it to be true. What should happen next?
Give the hint a test
In this hypothetical example, a radio signal appears to come from a distant star. Before calling it evidence of intelligence, researchers would need to investigate interference, instrument problems and other explanations. SETI detection protocols emphasise verification and independent observations. [1]
Now imagine a different headline: a planet’s chemistry looks interesting. That is a search for a possible biosignature—a sign of biological activity—not necessarily technology or intelligent life. NASA’s life-detection framework asks whether a measurement is reliable and whether nonbiological processes or contamination could explain it. [2]
What would change your mind?
For either headline, ask three questions: Can someone check the measurement? Which alternatives have been tested? Do separate lines of evidence support the same explanation?
These questions do not drain the excitement from discovery. They give it somewhere to stand. A finding becomes more compelling when it survives attempts to explain it another way.
What to keep in mind
Both examples are hypothetical. Biological life and technological intelligence require different investigations; there is no single universal proof checklist.
Sources & context
Numbered references link the explanation to its sources. Hypothetical examples and visual metaphors are labelled in the text. Checked 2 October 2026.
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