What Scientists Can Learn From Alien Hunters

Aliens—hypothetical beings from outer space—fall into roughly three categories. They could be far-away microbes or other creatures that don’t use technology humans can detect; they could be far-away creatures that use technology earthlings can identify; or they could be creatures that have used technology to come to Earth.

Each of these categories has a different branch of research dedicated to it, and each one is probably less likely than the last to actually find something: Astrobiologists use telescopes to seek biochemical evidence of microbes on other planets. SETI scientists, on the other hand, use telescopes to look for hints of intelligent beings’ technological signatures as they beam through the cosmos. Investigating the idea that aliens have traveled here and have skimmed the air with spaceships, meanwhile, is the province of pseudoscientists. Or so the narrative goes.

Although these three groups have a common goal—answering the question “Are we alone?”—they don’t always get along. Their interactions demonstrate a concept that sociologists call “boundary-work”: designing and building fences around Legitimate Science, and enforcing ideas about who counts as a scientist, who doesn’t, and why. Those fences are supposed to defend science’s honor, demonstrate scientists’ objectivity, and uphold the profession’s standards. That’s good! We want that! But the fence posts also demarcate a boundary that isn’t objective but is, in fact, a function of time, location, culture, social mores, social fears, and politics. The enforcement of this sometimes-shifting boundary can send people who find themselves on the outside further away from mainstream science, fostering a sense of antagonism and slighted outsiderism. The history of hunting aliens is a good way to understand those unintended consequences of boundary-work in other disciplines. Because even though none of the groups actually knows, or has gained access to, whatever ET truth is out there, science’s ideas about which ET-seeking methods are valid and which are fringey have changed over the past few decades.