The serious hunt for alien life

Summary

Podcast Summary: Short Wave – "The Serious Hunt for Alien Life"

Host: Regina Barber (NPR)
Guest: Dr. James Davenport (Astronomer, University of Washington, SETI Institute Collaborator)
Date: February 23, 2026
Episode Duration: ~15 minutes

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Episode Overview

In this episode, Regina Barber and astronomer James Davenport explore humanity’s ongoing efforts to find intelligent life beyond Earth. They discuss the history and science behind the Search for Extraterrestrial Intelligence (SETI), how technology and astronomical data have changed the search, and the philosophical and practical implications of the quest for alien signals in the universe.

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Key Discussion Points & Insights

1. Personal Connections to SETI

• Regina and James reminisce about participating in the “SETI@home” screensaver project in the 1990s and 2000s—early citizen science efforts to process radio signals using personal computers.
  • Regina recalls installing the program to contribute to the search.
  • James jokes about "[hijacking my parents' little Gateway 2000 and absolutely cooking it]" for the cause.
    • James Davenport (01:12):

      “It seemed like the one opportunity. Living in the middle of nowhere… I can be part of this journey that humankind is on. It was amazing.”

2. The History of the Search for Alien Life

• The search dates back nearly 100 years, with an anecdote about 1924 "Mars Day," when radio stations and the US military listened for signals from Mars.
  • James: "For five minutes on the hour for several days, they would black out all radio transmissions…and they would listen for signs of, you know, Martian NPR." (02:11)
  • Ultimately, nothing was found—"There was no Martian NPR." (James, 02:33)

3. The Enormity of the Search

• Even after decades of searching, humans have explored only a minuscule part of the “cosmic haystack.”
  • James Davenport (02:43):

    “If the thing we were looking for was the size of the ocean…we had looked at a pint glass of water compared to the volume of the ocean.”

4. The Foundations: Drake Equation and Modern SETI

• The Drake Equation estimates the likelihood of extraterrestrial civilizations capable of communication.
  • Explains that it depends on factors like the number of stars, habitable planets, and life-creating conditions.
  • James Davenport (05:05):

    “It’s the number of stars times the fraction of those stars that should have intelligent life... It’s the number of stars times the fraction of stars that have NPR or something like that.”

• Astrobiology has expanded understanding:
  • "Now we know that on average, every star roughly has at least one planet." (James, 06:03)
  • Even so, "there still is enough unknowns in that equation that we don't know the answer still." (James, 06:14)

5. SETI in Practice: From Radio Signals to Optical Astronomy

• The focus for decades was on detecting radio signals (“spikes, chirps”) from space.
• James describes how optical astronomy—using visible light telescopes and cameras—is an emerging complementary approach.
  • James Davenport (08:53):

    “We have put a lot of effort into [optical astronomy] for lots of other astrophysics and astronomy reasons…why aren't we looking for maybe the most interesting thing, looking for life…?”

  • The goal: leverage the vast existing data and broaden SETI’s search from a "hot tub" of data volume to an "Olympic swimming pool." (09:53)

6. The Next Leap: Vera Rubin Observatory

• Discussion of the soon-to-begin operations of the Vera Rubin Observatory in Chile.
  • Will create a dynamic, high-resolution survey of the sky using the world’s largest digital camera (size of a car).
  • James Davenport (10:18):

    “This camera is the size of a small car…[sampling] more than 10 billion stars…We're going to push that up to 10, maybe 15 or 20 billion stars in our galaxy. That's a total transformational shift.”

  • Expected impacts:
    • Double known asteroids/comets, revolutionize understanding of stars, supernovae, and, potentially, life detection efforts.

7. The Value of the Search

• Addressing the possibility of never finding proof of extraterrestrial intelligence:
  • James Davenport (11:51):

    “Success doesn't depend on finding something…The search itself is like the journey is the thing that we're after.”

  • James Davenport (11:59):

    “It may take 1000 years to know the answer to this question. We've only just begun looking. 1960 was not that long ago…Even if we get up to a swimming pool as compared to the ocean, that's only one swimming pool against a very big ocean…But that's okay.”

  • Value in collecting and preserving data—future technology or discoveries could reinterpret “boring” data in new ways.

8. Community and Hope

• Success hinges on collaboration between scientists and the public—a return to the spirit of SETI@home, but on a much grander, global scale.
  • James Davenport (13:07):

    “If our entire community of astronomers and scientists and the public come along with us, we're gonna make a dent.”

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Notable Quotes & Memorable Moments

• “If the thing we were looking for was the size of the ocean…we had looked at a pint glass of water compared to the volume of the ocean.” — James Davenport (02:43)
• “It may take 1000 years to know the answer to this question. We've only just begun looking.” — James Davenport (11:59)
• “Success doesn't depend on finding something…The search itself is like the journey is the thing that we're after.” — James Davenport (11:51)
• “If our entire community…come along with us, we're gonna make a dent.” — James Davenport (13:07)

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Key Timestamps

• [01:12] – James recounts his childhood participation in SETI@home.
• [02:11] – Early attempts to hear Martian signals in the 1920s.
• [02:43] – The cosmic search analogy: ocean vs. a pint glass.
• [05:05] – Explanation of the Drake Equation and its implications.
• [08:53] – Shifting from radio to optical astronomy in SETI.
• [10:18] – The transformative impact of the Vera Rubin Observatory.
• [11:51] – The philosophy of the search: it’s about the journey.
• [13:07] – The power and necessity of community science.

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Conclusion

This concise, thought-provoking episode unpacked both the technical and philosophical aspects of humanity’s search for intelligent life beyond Earth. While the answer to “Are we alone?” remains elusive, hosts Regina Barber and James Davenport illustrate just how much the hunt itself has changed — and why the search remains a rich, shared scientific adventure.

Tone: Enthusiastic, curious, and optimistic — with a spirit of discovery and communal effort running throughout.

Transcript

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[James Davenport]

For more.

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Capella University's flexpath learning format lets you earn your degree at your pace without putting life on pause. Learn [e-mail].

[Regina Barber]

you're listening to Shortwave from NPR. When I was a teenager in the late 90s, I downloaded a special screensaver. It had lots of pretty colors and graphs, but that's not why I wanted it. My goal was to humbly contribute to humankind's search for intelligent life in the universe, AKA aliens. This effort is officially called the Search for Extraterrestrial Intelligence, or SETI. The screensaver I downloaded, called SETIome, was part of a large scale community project to use people's everyday PCs to comb through radio signals that hit Earth from space, mostly from stars. These signals have particular patterns, so if astronomers find a signal that doesn't quite fit those patterns, it could mean some intelligent life is sending them. Within a few years, the SETI Home Project recruited 3.8 million people.

[James Davenport]

I hijacked my parents little Gateway 2000 and I absolutely cooked it trying to contribute to what seemed like the thing, right? It seemed like the one opportunity. Living in the middle of nowhere and sort of like rural eastern Washington, like, oh, I can be part of this journey that humankind is on. It was amazing.

[Regina Barber]

That's my friend James Davenport. He's an astronomer at the University of Washington and his focus is on stars. And I talked to him recently because, importantly for this episode, he's a collaborator with the SETI Institute, a nonprofit research organization that combs through astronomical data in search of signs of life outside of Earth. It's a search that goes way back, way before James and I took control of our family's computers to 1924, when many researchers were excited about Mars. And Mars orbit was close to Earth, making it a prime time to listen to signals from the planet. And so an unconventional astronomer named David Todd convinced multiple radio stations in the US and one in South America to go silent.

[James Davenport]

So for five minutes on the hour for several days, they would black out all radio transmissions in the US and they would listen. They would point the radio telescopes or the radio transmitters they had at Mars, and they would listen for signs of, you know, Martian NPR.

[Regina Barber]

David Todd even convinced the U.S. army and Navy to listen for anything unusual in radio signals.

[James Davenport]

Spoiler, they didn't find anything. There was no Martian npr.

[Regina Barber]

But humans have continued to look for signs of intelligent life in the universe. And James says, we've barely scratched the surface.

[James Davenport]

If the thing we were looking for was the size of the ocean. So far, as of about 2,000, we had looked at a pint glass of water compared to the volume of the ocean. Wow.

[Regina Barber]

And that's where our scientific efforts have mostly been looking at radio transmissions from outer space. SETI has looked for spikes, chirps and unusual things from radio telescopes for about 60 years. But James and others think there's so much more data to sift through outside of these radio signals. So today on the show, a legitimate look at the search for intelligent life in space, the ways we look, and how scientists are taking the search to the next level. I'm Regina Barber, and you're listening to Shortwave, the science podcast from npr.

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[Regina Barber]

Okay, James, let's just like get into it. There's this equation that people throw around. It's an equation that tells us the likelihood that there's alien life that could send us a sign. It's called the Drake Equation. Can you break that down for us?

[James Davenport]

So the Drake Equation is the number of stars times the fraction of those stars that should have intelligent life. It's capable of sending us signals. In its simplest form, it's the number of stars times the fraction of stars that have NPR or something like that. Now, what goes into that NPR term? Well, you have to have a planet. It has to Be at that Goldilocks distance from its parent star. It has to have water. It has to have all the ingredients that we know. And many of the ingredients we don't know. And there's a lot we don't know about what drives life. So the last 25 years, there has been a really big surge in this field called astrobiology. And they've tried to answer the parts of that equation like, well, how many stars have planets? Is it every star? Is it only stars like our sun? So now we know that on average, every star roughly has at least one planet. Wow. least one rocky type planet on average. Wow.

[Regina Barber]

There's so many.

[James Davenport]

That means there's so many. That means that for a galaxy of more than 100 billion stars, that means we have at least 100 billion planets to search. And even still, even after 25 years of astrobiology, we still don't know. There still is enough unknowns in that equation that we don't know the answer still. So there's a lot of work to be done.

[Regina Barber]

And the Drake equation doesn't take into account time. I personally was like, okay, the Universe is like 13.8 billion years old. Our sun is like around 4.6 billion years old. I feel like there could have been civilizations that have come and gone at that point. But that equation doesn't take that into account.

[James Davenport]

You can write it in a way that does. Right? You can write it in such a way that how many civilizations arise and what's the likelihood that they live long enough to develop radio telescopes and astronomy and space travel, perhaps? So you can write the equation sort of in different ways. It's not a strict equation in the same way as Einstein's theory of relativity. It's an equation that gives us kind of an outline for how to frame the problem. It's more of a illustration.

[Regina Barber]

Okay, so this illustration, this equation comes from a man who kind of began what led to, like, modern SETI.

[James Davenport]

So really what we consider the beginning of modern SETI is 1960. So Frank Drake, who some people know from the Drake equation, which tries to quantify what's the likelihood that we're alone in the universe. He was actually the pioneer where he had time on a radio telescope for good bread and butter astronomy reasons at this point in the 1960s, people are looking at galaxies and gas and dust in the sort of interstellar medium. And radio telescopes are a new technology still. And he decides to point it at a couple of nearby stars, to quote, unquote, listen, with the intent of looking for again, chirps or pulses or some kind of transmission. He doesn't find anything, but he starts what he calls Project Ozma, named after the wizard of Oz.

[Regina Barber]

Oh, my gosh. Okay, cool.

[James Davenport]

And he starts to look for signs of, you know, transmissions, intentional transmissions from technology. And this is really the beginning of what we call SETI, the Search for Extraterrestrial Intelligence.

[Regina Barber]

Okay. And since SETI has, like, been efficiently operational, that's like 1985, we haven't found anything. Right, but you mentioned that analogy that, like, we've only searched like the equivalent of a pint glass of water versus, like the ocean that is the entire sky.

[James Davenport]

We've done a lot of work since. So my estimate a couple years ago was we've pushed that from a pint glass of water to maybe a hot tub.

[Regina Barber]

Okay, that's not bad.

[James Davenport]

Yeah, that's massive progress. Right? There's a lot of pint glasses in a hot tub.

[Regina Barber]

Yeah, yeah. But you're an astronomer, right, that looks at stars, not radio signals. But you're working with seti, so, like, how are we going to search more of the sky? Like, get more than a hot tub and an ocean of water?

[James Davenport]

Right. So I am an optical astronomer by training. I'm a stellar astronomer. I look at stars with sort of classical optical telescopes that you would look through with your eyes and we attach digital cameras to. This is not the area that SETI has worked on for like 60 years, but we have put a lot of effort into it for lots of other astrophysics and astronomy reasons, because stars are bright and there's fun physics, there's lots to learn there in the cosmos, and that's what I spent 20 years doing. And then this realization that we're putting all this money into optical astronomy, why aren't we looking for maybe the most interesting thing, looking for life, Looking to answer these questions about whether or not we're alone. My inner 8 year old, my inner Star Trek nerd started putting this together that we should use the data that we have and try to figure out how to pull the knowledge from 60 years of radio astronomy and apply it into this optical visible light astronomy. My hope in pushing this from the radio into the visible light, into the infrared and other domains of astronomy that are so active, is that we can actually push this from a hot tub to maybe an Olympic swimming pool.

[Regina Barber]

Okay, so there's even better technology on the horizon to make the search, like, even more comprehensive. I'm thinking of like the massive Vera Rubin telescope being built in Chile right now. How do you see this telescope impacting how we look for life outside of Earth.

[James Davenport]

So just yesterday, the very first.

[Regina Barber]

Yesterday being January 14th, right?

[James Davenport]

The very first, like, commissioning image from the telescope from, like, their engineering camera was shown. Wow. And it's beautiful. And it's early days, but, like, the telescope is now being tested and everything is being aligned. So it is. It has gone from 20 years of development to a reality. This telescope, it's going to sit in chile and for 10 years create this mosaic moon movie of the sky. And it's going to watch the sky every night with the world's largest digital camera built in California, shipped all the way to Chile. This camera is the size of a small car. Right. It's massive, powerful camera attached to an eight and a half meter telescope. Right. So an enormous piece of glass, one of the sort of 10 biggest pieces of glass ever built. It's incredibly powerful. And what you get for all that is a sample of mount more than 10 billion stars. The best samples of stars so far are 1 to 2 billion. We're going to push that up to 10, maybe 15 or 20 billion stars in our galaxy. Wow. That's a total transformational shift. It's going to be something that really is a tide that raises all the sort of astronomical boats. We're going to see the binary stars and the supernova. We're going to double the known number of asteroids and comets in the solar system. Important in the first year.

[Regina Barber]

You're getting me excited.

[James Davenport]

Good.

[Regina Barber]

But James, all these decades of searching, we really haven't found anything. How are you this patient? How do you keep yourself inspired that this is gonna be this new era of seti?

[James Davenport]

Because success doesn't depend on finding something. Right. The search itself is like the journey is the thing that we're after.

[Regina Barber]

Wow.

[James Davenport]

It may take. This is what I tell my students. It may take 1000 years to know the answer to this question. We've only just begun looking. 1960 was not that long ago. Right. And even if we do all of our work and we get it up to a swimming pool as compared to the ocean, that's only one swimming pool against a very big ocean of possible parameter space that we're looking, it is going to take a long time to put this story together and to be sure that we have found something or that we haven't, that we're alone or that we're not, that's okay. The advent of photography and computers means that our data is forever. So a star that doesn't do anything that seemed boring to us for 10 years, 25 years from now, it might do something interesting. And if we don't have that record, if we don't do our work, then they don't stand a chance of finding anything.

[Regina Barber]

James, thank you so much for coming here and really making me excited about searching for life in space.

[James Davenport]

If we all pitch in, if we all do a little bit like we

[Regina Barber]

did, like we did with those screensavers,

[James Davenport]

with the screensavers when we were kids, if our entire community of astronomers and scientists and the public come along with us, we're gonna make a dent.

[Regina Barber]

This episode was Produced by Burleigh McCoy and edited by showrunner Rebecca Ramirez. Tyler Jones checked the facts. Kwesi Lee was the audio engineer. Beth Donovan is our senior director and Colin Campbell is our senior vice president of podcasting strategy. I'm Regina Barber. Thank you for listening to Short Wave from regular ol npr, not Martian N.

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