Thursday, September 10, 2026

A brief farewell message.


Hi, this is the Wow! Signal podcast, and I’m your host, Paul Carr. 

This is the last recording I will make for this podcast. It is time to finally move on.

I began this podcast with Episode 1 near the end of 2012 when I was in my mid 50s. Although we have been on a very long hiatus since Episode 50, I had the intention that when I retired I would either bring the podcast out of hiatus or permanently end it. As I got closer to that time, I understood that I only wanted to restart the podcast if I could put a fair bit of time and energy into it and put out frequent, quality content. Like the previous episodes, the new ones would be commercial free, audio only, go as deep as we could on our core topics, and would sometimes refer to Douglas Adams. 

Now that I am retired, and things are much more real, I have decided that I am not going to do this. I won’t revisit all my thinking about this, but part of it is that similar content is now widely available on multiple platforms, often accompanied by skillfully produced video. David Kipping’s Cool Worlds is a good example.

So, while I am not necessarily exiting podcasting forever, I am going to meet the commitment that I made to myself not to fade the Wow! Signal without notice, but to unambiguously announce the end of the podcast while expressing my deep gratitude to everyone who participated and who made the content much, much better than I could have made it by myself. I’m proud of our 50 Episodes and 34 Bursts - shorter, more focused episodes - and even the pubs I hosted and enjoyed immensely. 

The podcast rss feed and the wowsignalpodcast.com domain will remain up for some time to come, but if you want to listen to any past episodes, I suggest you go to wowsignalpodcast.com and download the .mp3 files that interest you to listen to them at your convenience. I will have many of the episodes available on YouTube as well. If there is an episode you would really like a transcript of, I can probably supply one - just get in touch and I’ll see what I can do.

I’m going to thank everyone I can think of, and I apologize in advance if I left anyone out. I’ll start with the folks who actually helped me create the podcast, and often had the idea for an episode or burst: Daniela DePaulis, Nick Nielsen, James Garrison, and Mike Mongo. I’m sorry I’ve been out of touch and hope we can meet up someday.

Now, my many great guests. I’ll list their names now. Some of them appeared more than once. There were people I never had on that I regret missing, and if you think I should have emailed you with an appearance request, you may well be right.

Our first guest was Antonio Paris, founder of Aerial Phenomena Investigations. This was followed by:


Geoffrey Landis (twice)

Nikola Danaylov

David Grinspoon (3 times)


Seth Shostak

Bing Garthright

Duncan Forgan (twice), Isaac Stott, Ben Wright McGee

Fraser Cain

Paul Shuch

Geoff Marcy + Ana Heras

Daniel Cartin

Nicholas Joll

Heath Rezabek, Robin Hanson

Steven Dick, Betul Kacar

Duncan Lunan , Alan Penny

Abel Mendez (twice)

Bob Dixon

JL Galache + Duncan Lunan

Tom Barbalet

Andrew Siemion


Martin Elvis

Bradley Schaefer

Tabetha Boyajian

Stella Kafka

Bradley Schaefer

Douglas Vakoch (twice)

Nathaniel Comfort

Ben Montet


Doug Vakoch

Jon Lomborg

Frank White

Sofia Sheikh

Daniel Oberhaus

Beatriz Villarroel

Julia Demarines

Adam Dipert

Stella Kafka

Paolo Costaño

Wade Roush

David Skogerboe

Chelsea Haramia

Thomas Moynihan

In addition, the following people were guests on Bursts:


Mike Mongo

Nora Noffke

Daniel Cartin

Jeff Nosanov

Josh Grindlay

Jason Hessels

Beatriz Villarroel (twice)

Tabetha Boyajian (twice)

David Blank


Also, thanks to our Patreon donors and our Wow! Signal Pub participants, and Erin Carr and Joyce Abma for voiceover help. 

Finally, thanks to all the musicians who let me use their music: Ahleuchatistas, Mike Griffin, DJ Spooky, Jason Robinson, Erika Lloyd, Sleep Research Facility, House Band of the Universe, George Hrab,  Eben Brooks, and many others.

Well, everything ends sooner or later, and this podcast is ending now. It ran for 12 years, we had a good run, and I am happy I did it. 

I hope I’ll run into you in real life, or on other platforms or in other projects. I have largely curtailed my social media presence in recent years, but you can still find me on Bluesky. Hey, we may even do another pub someday. See you there?

Links

Thursday, September 12, 2024

Episode 50 - Arecibo Wow! with Professor Abel Mendez


AbelReleased: 11 September 2024
Interview Recorded: 22 August 2024
Duration: 67 minutes, 19 seconds

Download the .mp3 audio file

We welcome back Professor Abel Mendez from the University of Puerto Rico to tell us about recent research into data from the Arecibo radio telescope into cold hydrogen clouds and a proposed natural explanation for the Big Ear Wow! Signal that we covered in depth in Episode 19.

We recommend you download the draft paper so you can follow along.

Links:

Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal

Our episode (#19) with Big Ear scientist Bob Dixon

A previous appearance by Abel Mendez on this podcast.

Planetary Habitability Laboratory at the University of Puerto Rico

The Arecibo Radio Telescope Collapse

The FAST Radio Telescope

Astrophysical MASERs (microwave lasers)

Harvard & Smithsonian Center for Astrophysics: Masers

Population Inversion (Wikipedia)

The Hydrogen 21 cm line

MASERs, Interstellar and Circumstellar, Theory.

Credits

Host, editor, producer: Paul Carr

Music: Quincas Moreira (Black Swan), George Hrab (Far), Jason Robinson

Episode 50 of the Wow! Signal Podcast© 2024 by Paul Carr is licensed under CC BY 4.0. To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/

Wednesday, August 28, 2024

Pub #7 available on YouTube

 Feel free to listen to Pub #7 with Nick Nielsen, Mike Bohler, Rock Howard, and Paul Carr




Thursday, July 15, 2021

Burst 34 - The Mystery of the Nine Transients


Interview recorded: 11 July 2021

Released: 16 July 2021

Duration: 21 minutes, 33 seconds

Beatriz Villarroel discusses her latest VASCO paper in Nature Scientific Reports, "Exploring nine simultaneously occurring transients on April 12th 1950."

Links:

Villarroel+ , Exploring Nine simultaneously occurring transients on April 12th 1950.

Burst 19: Our Sky Now and Then (August 2016)

Episode 41: The Vanishing Sources with Beatriz Villarroel (November 2019)

The Vanishing & Appearing Sources during a Century of Observations project: I. USNO objects missing in modern sky surveys and follow-up observations of a "missing star

The Palomar Digital Sky Survey

Gran Telescopio Canarias

The United States Nuclear Testing Program

Credits

Host and Producer: Paul Carr

Music: Ahleuchatistas and Erika Lloyd


Thursday, February 4, 2021

Episode 49 - Existential Risk


Released: 4 February 2021

Duration: 58 minutes 44 seconds

Co-hosts Paul Carr and Daniela DePaulis are joined by author Thomas Moynihan. The subject is the idea of human extinction and how it evolved into our present day understand of Existential Risk.


Guest Bio:

Thomas Moynihan

I am a writer and researcher from the UK. In 2019, I completed a PhD at Oriel College on the history of human extinction. Currently, I am a visiting Research Associate in History at St. Benet's College, Oxford University, and I am working for Oxford's Future of Humanity Institute with a grant from the Berkeley Existential Risk Initiative. 
 
I am interested in the history of existential risk and of existential hope: that is, how people first came to understand the perils and promises that face us as a species. I see this as the central philosophical drama of the modern world: how we came to appreciate our position—and precarity—as intelligent beings within an otherwise seemingly silent and sterile universe. 
 
My goal is to reveal how contemporary research into global risks can be seen as part of the wider story of our ‘coming of age’ as a civilisation and a species.

Links:

Thomas Moynihan - https://thomasmoynihan.xyz

X-Risk at MIT Press: https://mitpress.mit.edu/books/x-risk

Mary Shelley - The Last Man

Churchill - Shall We All Commit Suicide?

The Order of the Dolphin

Frank Drakę: A Speculation on the Influence of Biological Immortality on SETI

Natural Selection of Stellar Civilizations by the Limits of Growth

The Jaws of Darkness

The Ethics of METI

Credits:

Co-hosts: Paul Carr and Daniela De Paulis

Producer: Paul Carr

Music: Sun Ra and his Intergalactic Solar Arkestra, DJ Spooky


The Wow! Signal is released under the Creative Commons Attribution/Share-Alike license.

Sunday, December 13, 2020

Wow! Signal Pub #4 Video

 Here's the video for Wow! Signal Pub #4. Present were Ciro Villa, Rock Howard, Buck Field, Nick Nielsen, and Paul Carr. We covered a wide range of topics from 2001 A Space Odyssey to Luna Lee.

Hope to see you there on Pub #5, which will probably be in March 2021.



Monday, November 30, 2020

Wow! Signal Pub #4 coming up soon

 We're planning the next Wow! Signal Pub soon. It's a live-streamed ramblecast, with no set agenda, no show notes, no definitive start/stop time, and no solemnity. you can say what you want, but it goes on your permanent record. Participation is open to pretty much anyone, but you have to give me your e-mail address so I can send you the Zoom invite.

Right now, the date and time to pencil in is 12 December at 16:00 Eastern Standard Time (23:00 UTC). We'll update that as we get closer. Hope you can make it.