Uploaded February 2025 | Updated September 2026, 3 weeks ago
Support the show: patreon.com/pmsutter
Astronomers believe that a mysterious, invisible substance fills up the universe. Known as dark matter, they think it is a new kind of particle. But efforts over decades to find this particle have come up short. On the other hand, no alternative theories have successfully emerged. The answer to this problem may come from an unexpected direction: a strange kind of particle known as an axion.
0:00 - Intro
2:51 - The Darkness Overwhelms
9:54 - Einstein's Ghost
16:22 - Empty Searches
23:51 - The Rise of the Axion
29:04 - Outro
Written and hosted by Paul M. Sutter
Produced and filmed by Mike Hurst
Editing by Chad Barnard
Support the show: patreon.com/pmsutter
Astronomers believe that a mysterious, invisible substance fills up the universe. Known as dark matter, they think it is a new kind of particle. But efforts over decades to find this particle have come up short. On the other hand, no alternative theories have successfully emerged. The answer to this problem may come from an unexpected direction: a strange kind of particle known as an axion.
0:00 - Intro
2:51 - The Darkness Overwhelms
9:54 - Einstein's Ghost
16:22 - Empty Searches
23:51 - The Rise of the Axion
29:04 - Outro
Written and hosted by Paul M. Sutter
Produced and filmed by Mike Hurst
Editing by Chad Barnard
![Whats Really Inside Empty Space? [Ask a Spaceman]](https://i.ytimg.com/vi/wRsWWR8BVIo/mqdefault.jpg "Whats Really Inside Empty Space? [Ask a Spaceman]
Support: http://www.patreon.com/pmsutter
0:00 - Intro
2:20 - Whole Lotta Nothing
10:14 - Ottos Vacuum
18:03 - Theres Always Something
22:07 - Vacuum Energy
27:29 - Is Space Really Empty?
36:24 - Gravitational Waves
39:40 - Thank You
Follow all the show updates at http://www.askaspaceman.com, and help support the show at http://www.patreon.com/pmsutter!
What’s floating around in space between all the stuff? Are there any truly empty places in the universe? What is the “fabric” of spacetime? I discuss these questions and more in today’s Ask a Spaceman!
Keep those questions about space, science, astronomy, astrophysics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!")
