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The Supermassive Podcast

The Royal Astronomical Society
Black Holes
Mars
Royal Astronomical Society
James Webb Space Telescope
NASA
Gravitational Waves
Solar System
Astronomy
Gravity
Neutron Stars
Venus
Dark Matter
Extraterrestrial Life
Cosmology
Fast Radio Bursts
SETI Institute
Earth
Primordial Black Holes
Baby Names
Multiverse

The UK's #1 space podcast.

Science journalist Izzie Clarke and astrophysicist Dr Becky Smethurst whizz through the universe to explore the latest research with leading experts, dive to history from the society’s archives and take on your weird and wonderful questions about all things space. Can we gravitationally hitch-hike out of the solar system? Do we live in a multiverse? What is time? Plus Dr... more

PublishesTwice monthlyEpisodes115Founded6 years ago
Number of ListenersCategories
PhysicsScienceAstronomy

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Artwork for The Supermassive Podcast

Latest Episodes

Nancy Grace Roman. Ariel. The next generation of space telescopes are here. Astrophysicist Dr Becky Smethurst and science journalist Izzie Clarke explore how they work, what they can tell us and why they might unravel our current understanding of the... more

How do we calculate a black hole's event horizon? Does Mercury's tail impact Earth? Can we name a planet Rupert? And did gravity wipe out the dinosaurs? Izzie Clarke & Dr Becky Smethurst dive into the rather whimsical Supermassive Mailbox to answer y... more

Izzie & Dr Becky think that space needs a spring clean, so this episode is all about space debris. What is it? How big of a problem is it? And what is being done to remove it? 

With thanks to PhD student Megan Perks from the University of Southampto... more

What. A. Mission. The Supermassive Team are in AWE of the Artemis II Crew and the people that helped them to loop around the Moon. From scientific aims to societal impact, Izzie Clarke, Richard Hollingham and Dr Robert Massey reflect on this latest s... more

Key Facts

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Recent Guests

Megan Perks
Researcher at University of Southampton studying space debris safety
University of Southampton
Episode: Into the Space Debris Swamp
Max Alexander
International photographer focusing on space and debris; organizer of Our Fragile Space exhibition
Photographer
Episode: Into the Space Debris Swamp
Dr Robert Massey
Deputy Director of the Royal Astronomical Society
Royal Astronomical Society
Episode: Into the Space Debris Swamp
Stuart Clark
Editor of Astronomy Now magazine
Astronomy Now
Episode: When Space Goes Rogue....
Phil Lord
Director and producer of the film
Sony Pictures / Film Project
Episode: Black holes in the lab and meeting Ryan Gosling
Chris Miller
Director and producer of the film
Sony Pictures / Film Project
Episode: Black holes in the lab and meeting Ryan Gosling
Adam Riess
Professor of Physics and Astronomy, Nobel Prize in Physics 2011
Johns Hopkins University; Space Telescope Science Institute
Episode: What is the Hubble Tension?
Silvia Galli
Cosmologist studying the CMB
Institute of Astrophysics, Paris
Episode: What is the Hubble Tension?
Dr. Emma Osborne
Theoretical physicist from the University of York
University of York
Episode: How to Time Travel

Hosts

Izzie Clarke
Science journalist and host focusing on space science and public outreach.
Becky Smethurst
Astrophysicist and co-host, known for accessible explanations of complex space topics.
Robert Massey
Deputy Director of the Royal Astronomical Society; co-host providing institutional and policy perspectives.

Reviews

4.8 out of 5 stars from 1.5k ratings
  • Ban 3

    Great info in your casts, don’t worry about the magas they hate everyone

    Apple Podcasts
    5
    Jeffbanner3
    United States24 days ago
  • Fantastic

    Great podcast. Very informative and entertaining about what’s going on in the sky and the research being done. Love the enthusiasm of the hosts.

    Apple Podcasts
    5
    GEMW85
    United Kingdom3 months ago
  • Brilliant!

    Great topics, brilliant hosts and super informative. Do a live show!!

    Apple Podcasts
    5
    MrLewisDean
    United Kingdom3 months ago
  • Liberals.

    I liked this show alright I guess till they got into POLITICS and rewrote history. Pluto was a panel until Barack HUSSEIN O’Bummer cancelled it because it wasn’t woke enough. Don’t try to push your views to anyone. MAGA!!!

    Apple Podcasts
    1
    EvanWagnerATL
    United States4 months ago
  • Irritating hosts on the show

    Irritating hosts on the show, they seem like school kids and are patronising to both guests of the show and its audience.

    Apple Podcasts
    1
    NickyB65
    United Kingdom4 months ago

Listeners Say

Key themes from listener reviews, highlighting what works and what could be improved about the show.

Occasional criticisms about host dynamics; audience enjoys humor but some find it distracting.
Strong guest variety and high-quality science content.
Clear, insightful discussions with accessible explanations.

Chart Rankings

How this podcast ranks in the Apple Podcasts, Spotify and YouTube charts.

Apple Podcasts
#1
United States/Science/Astronomy
Apple Podcasts
#48
United States/Science
Apple Podcasts
#1
United Kingdom/Science/Astronomy
Apple Podcasts
#2
Canada/Science/Astronomy
Apple Podcasts
#33
United Kingdom/Science
Apple Podcasts
#44
Canada/Science

Talking Points

Recent interactions between the hosts and their guests.

Did Gravity Wipe Out The Dinosaurs?
Q: Does the gas tail from Mercury reach Earth and could it affect Earth in any noticeable way?
Becky and the team respond that Mercury's tail is extensive but extremely tenuous and would not affect Earth; Venus also has a tail, but likewise with negligible impact on Earth due to vast distances and low particle densities.
Did Gravity Wipe Out The Dinosaurs?
Q: How far out is the event horizon for a 20-solar-mass black hole and how does it compare to more familiar scales?
The host explains that for that mass range the event horizon is on the order of a few tens of kilometers, derived from the Schwarzschild radius, and emphasizes the scale is minuscule compared with astronomical distances.
Did Gravity Wipe Out The Dinosaurs?
Q: Hello, firstly, are there formulas to approximate the distance of a black hole's event horizon from the singularity based on the progenitor star's mass?
Becky explains that while there is no single simple equation for the outer boundary of the core, there are relationships and models that tie black hole mass to the Schwarzschild radius, with the understanding that core collapse and energy generation involve complex stellar physics; a back-of-the-envelope approach is insufficient for precise values.
Into the Space Debris Swamp
Q: How dangerous is space debris for future humans planning to live in space and on the moon?
Space debris poses a major risk to both spacecraft and spacewalks, with high-velocity debris capable of damaging suits, stations, and habitat modules; while lunar space is comparatively less congested, careful planning and debris mitigation will be crucial for any long-term off‑Earth living plans.
What is the Hubble Tension?
Q: Could the crisis in cosmology be an indicator of dark energy being non-constant throughout the universe's history?
Yes, that is a major line of inquiry. If dark energy changes with time, then the relation between distance and expansion inferred from the early universe could differ from local measurements, suggesting new physics or revisions to the standard model.

Audience Metrics

Listeners, social reach, demographics and more for this podcast.

Listeners per Episode
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Frequently Asked Questions About The Supermassive Podcast

What is The Supermassive Podcast about and what kind of topics does it cover?

This show delivers accessible space science with a blend of expert interviews, news roundups, and listener Q&As. Topics span brave questions about time, gravity, and cosmology to pressing issues like space debris, satellite constellations, and upcoming missions. A hallmark is mixing rigorous science with playful chatter and clear explanations, making complex topics approachable for curious listeners who want both depth and entertainment. A standout is the strong connection to the Royal Astronomical Society, plus a recurring emphasis on public engagement and outreach through exhibitions, events, and collaborations with prominent researchers.

Listeners likely skew toward science-minded individuals who enjoy approachable explanations, occasio... more

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Which podcasts are similar to The Supermassive Podcast?

These podcasts share a similar audience with The Supermassive Podcast:

1. SpaceTime with Stuart Gary
2. Universe Today Podcast
3. The Astrophysics Podcast
4. Ask a Spaceman!
5. Space Nuts: Astronomy Insights & Cosmic Discoveries

How many episodes of The Supermassive Podcast are there?

The Supermassive Podcast launched 6 years ago and published 115 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on The Supermassive Podcast?

Recent guests on The Supermassive Podcast include:

1. Megan Perks
2. Max Alexander
3. Dr Robert Massey
4. Stuart Clark
5. Phil Lord
6. Chris Miller
7. Adam Riess
8. Silvia Galli

To view more recent guests and their details, simply upgrade your Rephonic account. You'll also get access to a typical guest profile to help you decide if the show is worth pitching.

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