How serious are we about searching for extraterrestrial life? While discussions about advanced civilizations and Dyson spheres can wait, even the discovery of alien bacteria would be exciting. Imagine the engineering challenge: design a detector that lights up and beeps upon encountering a living organism. Before reaching for your soldering iron, consider what the device should respond to. Metabolic exchange? Isolated reactions can be mimicked by autocatalysis. Growth and structural maintenance? Such vague criteria could even include a candle flame. Perhaps reproduction could serve as a life marker? However, mules, hybrids of horses and donkeys, do not produce offspring. What about borderline life forms like prions, which are proteins without genomes that can replicate, unlike mules? The debate over whether prions are alive is subjective. The real issue is that we spend billions searching for signs of life in Martian sands and Venusian clouds without a consensus on what constitutes a living discovery.
Life Detector Without Specifications
Exploring the concept of a life detector that identifies extraterrestrial organisms raises numerous engineering challenges.
