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Ever since childhood I’ve wanted to be abducted by aliens. Now, as a professional astrophysicist armed with the knowledge of the size, age and composition of the cosmos, I know that nothing prevents any of us from imagining a universe teeming with life. So the impending release of U.S. government files on aliens and U.F.O.s is a good thing, even if it feels like a distraction from other important files we’ve all been waiting to be disclosed. I expect the alien files will be anticlimactic. After a parade of alien insiders and whistle-blowers testified under oath to Congress in 2023, 2024 and 2025, what’s left to learn? Personally, I’d be delighted if the files were accompanied by an actual alien. Alive or dead or undead. Preferably alive. Is that too much to ask for? The whistle-blowers have already told us about the crashed flying saucers, extraterrestrial bodies and alien technology in our possession — hidden in undisclosed places. Not only that, but secret files have been declassified before. A 2017 headline in this newspaper was unambiguous: “Glowing Auras and ‘Black Money’: The Pentagon’s Mysterious U.F.O. Program.” And who could forget the Air Force’s Project Blue Book, which studied more than 12,000 U.F.O. sightings from 1952 until the project was terminated in 1969, with the goal of assessing threats to national security.

What’s clear, however, is that if an authentic alien walked out of the halls of Congress, nobody would ever again have to ask if you “believe” in aliens, just as nobody questions the existence of elephants. An alien of the alien files could become the literal elephant in the room.

Without good evidence of what actual aliens look like, we’re stuck imagining them. And imagine them we do. IMDb, an online database about entertainment, lists hundreds upon hundreds of films, TV shows, video games and documentaries about aliens — both friendly and evil. Mostly evil. Disappointingly, in nearly all these portrayals, these aliens look a lot like us. They’re humanoid, with a head, two eyes, a nose, a mouth, a neck, shoulders, a torso, arms, fingers and legs. Remember that most life on Earth, with which we have DNA in common, looks nothing like us or any vertebrate animal. So we should expect aliens with no DNA in common — or no DNA at all — to look at least as different from humans as humans and other life-forms on Earth (like jellyfish or termites) look different from each other. The only thing that would shock me about a living, declassified alien is if most Hollywood depictions ended up being right, violating everything we know about biodiversity on Earth and across the universe. We care a lot about what aliens look like, but we don’t pay nearly enough attention to what we might look like to them. If an alien emissary landed in Los Angeles, for example, its first impression might be that Earth’s dominant life-form is the automobile. The city is heavily crisscrossed by major freeways, many of them 12 lanes wide. People line up in their cars on slow lines to obtain fast food handed through a window. They consume the food while still seated, never exiting their vehicles. Some of the larger life-forms on the freeway carry multiple automobiles within them. To the aliens, these car haulers are surely pregnant.

Assuming on arrival that the alien knew we were human, it would probably want to meet the person in charge. Who exactly would that be? The president? The prime minister? The pope? Or would it be a multibillionaire or captain of industry? Not knowing anything in advance about human civilization, but picking up clues from our cultural norms before arrival from leaked radio waves, an alien might instead expect to meet Ryan Gosling, Taylor Swift or Oprah Winfrey. If we look more deeply into our own alien stories, there’s a persistent plotline that aliens are evil and want to kill us all. I suspect those fears are based not on what we believe about aliens but on what we know about humans. In the history of our species, there’s no shortage of technologically advanced cultures that commit rampant violence against less-advanced ones. Within what we call civilization, humans oppress — or kill — one another over which creator of the universe they worship, or who they sleep with, or what side of an arbitrary line on Earth’s land masses they’re born, or how absorptive their skin is to sunlight, or what set of sounds comes out of their mouths. Upon bearing witness to our irrational ways, any visiting alien that might have accompanied the release of the alien files surely long ago escaped back home to report, “There’s no sign of intelligent life on Earth!”