Space aliens are one of the most common tropes of science fiction, and with good reason. We live in an immense universe and there seem to be a massive number of planets out there. Surely, at least a few are inhabited, right? Most Americans in opinion polls seem to believe this. A poll from November 2025 found that 56 percent of adults surveyed said they thought aliens exist. Former president Barack Obama appears to be one of them based on a recent interview he did with podcaster Brian Tyler Cohen. But whether aliens exist or not is only one of so many interesting questions the scenario presents us. And there’s one that perhaps you might not have thought of: If we ever met them, how could we even communicate with them? In novels, film, and television, decoding alien languages seems to always be a quick affair—math is math, after all. But that assumption is a very big one if you think about it. While they might seem universal, science, math, and language are all human constructs, even though they describe relationalities that are real. My guest on this episode is someone who’s thought a lot about all of this. Daniel Whiteson is a particle physicist at the University of California–Irvine and the host of the science podcast, Daniel and Kelly’s Extraordinary Universe. But the centerpiece of our discussion today is his new book, Do Aliens Speak Physics? And Other Questions about Science and the Nature of Reality. The video of our conversation is available, the transcript is below. Because of its length, some podcast apps and email programs may truncate it. Access the episode page to get the full text. You can subscribe to Theory of Change and other Flux podcasts on Apple Podcasts, Spotify, Amazon Podcasts, YouTube, Patreon, Substack, and elsewhere. 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It is provided for convenience purposes only. MATTHEW SHEFFIELD: And joining me now is Daniel Whiteson. Hey, Daniel, welcome to Theory of Change. DANIEL WHITESON: Thanks so much for having me on. So excited to talk to you about aliens. SHEFFIELD: And we have a perfect news hook. Recently, of course, Barack Obama, the former president, people thought he was saying that aliens were real. And he was saying, well, I only meant statistically real. And then Donald Trump feeling like he wanted attention, said he was going to declassify all the stuff that the government has on that, which I somehow doubt that’s going to happen. What did you think about all that? DANIEL WHITESON: I am curious what Obama thinks about aliens, because he’s a smart guy and he probably has seen stuff that I haven’t seen, so there could have been information there, but I don’t feel like we really learned very much. His opinion is sort of the opinion any well-educated, non-technical person is likely to have, that there’s lots of planets out there and so it seems improbable that none of them have life on them. But the problem with that is that science doesn’t know [00:04:00] whether the chances of life starting on a random planet. So it could very well be that there are 30 cajillion planets out there, but the chances of life are less than one over 30 cajillion. And so we are alone in the universe. Just the sheer number of planets doesn’t tell you. That there are definitely aliens out there. Of course, I want there to be aliens, but you know, you have to be very careful in science not to convince yourself of something you want to believe. You need the evidence, and we just have no evidence to suggest that life starts many times in the cosmos. SHEFFIELD: Yeah, we don’t, well, because we have only seen life on evolve on one planet. WHITESON: Exactly. SHEFFIELD: Yeah. And so, and that takes us to there’s an attempt to extrapolate, well, what are the odds of alien life existing, and that’s called the Drake equation. So, what is that for people who don’t know. WHITESON: Yeah, it’s a big question. What are the odds that there’s life out there that could communicate with us? And so a few decades ago, Frank Drake broke it down and said, well, you can express it in terms of the various pieces in order for there to be aliens out there who could talk to us. There have to be stars. And those stars have to have planets. And at the time, for example, we didn’t know how common it was for stars to have planets. We had only ever seen planets in our solar system until, you know, 1995. And so even just extrapolating other solar systems with stars and planets, that was a big leap at the time. It was an, it was an unknown. And so then you have to know what fraction of those planets have life, what fraction of those life filled planets have intelligent life? What fraction of those are civilized, uh, what fraction of those develop technology, and then how long they stick around to potentially communicate with us. And the structure of the equation is very simple. It’s just all these fractions multiplied by each other. And you know, it’s the Drake equation. He’s famous for it. And you might look at it and say. That’s a very simple equation. I mean, look at it compared to like the Schrodinger equation, a partial [00:06:00] differential equation. It’s all complicated. It’s got wave functions in it. The Drake equation seems trivial, but the structure of the Drake equation is really important. It tells you something really deep about the nature of this question. Are there aliens out there who can talk to us? It tells us, because all the numbers are multiplied by each other, that if any of those numbers are zero, it doesn’t matter what the other ones are. So if there are no life failed planets out there, it doesn’t matter how likely it is for life to become intelligent because there is no life. Or if the probability for, you know, intelligent life to become technological in our way is zero or very close to zero, then the whole number is very, very small. And so in order for it to work, in order for there to be aliens out there communicating, communicating with us, you need everything to line up. You need stars, you need planets around those stars. You need life on those planets. You need technology, you need everything in sync, or it’s just not gonna happen. That’s what the Drake equation tells us. SHEFFIELD: Yeah. Well, and, and there are a lot of people who argue that it underestimates the odds by quite a bit. WHITESON: Yeah. And SHEFFIELD: including the, the famous Fermi paradox, right. WHITESON: Yeah. The Fermi Paradox says, boy, why haven’t we been contacted? Because if you look at some of these numbers, right, this is basically Obama’s argument too. Now we know the number of stars in the galaxy is huge, hundreds of billions. And the fraction of those stars that have planets around them is shockingly large. It’s something like 10 to 40%. And you know that number could have been 0.0, 0, 0, 0, 0, 0 1, right? The fraction of those planets with a rocky planet inhabitable zone. Boy, that could have been a small number, but it’s wonderfully large, which means there’s a huge number of potentially habitable planets out there. And that’s as far as we know. Right. And Fermi Paradox, or, the Obama paradox, I guess is saying, look, there’s all these planets out there, and the galaxy is quite [00:08:00] old. It’s, been around almost since the beginning. Our solar system’s only four and a half billion years old, but the Milky Way itself is 13 ish billion years old. And in all that time, why has nobody visited us or left a marker for us or something? Right. Where is everybody? So that’s the Fermi paradox is to say, if there are all these planets out there, where is everybody? And of course, there’s several various answers to that question. SHEFFIELD: Well, and then, and your book is kind of the, the step after all that. So, assuming these things exist or beings exist, how could we even talk to them and how could we even understand what they’re saying? That’s kind of the crux of your book. So I, I, tell me, tell me about the background of, of how you got into why you decided to write it. WHITESON: Yeah, so I’m very excited for aliens to come. And I was thinking a few years ago, like, why am I excited for aliens to come? Is it just science fiction, first context, coolness? And yes, that would be a lot of fun, and I watch a lot of science fiction, but one of the reasons that I’m excited for aliens to come is the possibility that they could fast forward our physics. You know, we’ve been doing physics for a few hundred years or thousands if you give the Greeks credit, but if an aliens get here, that’s suggested, they’re probably more advanced than we are because we can’t get to them, which means they might have been doing physics for. Millions, bil