The Supermassive Podcast

The Supermassive Podcast

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 Robert Massey is on hand with his top star-gazing tips. Want to support the show? Join The Supermassive Club for exclusive content, star-gazing forums and ad-free listening... supermassive.supportingcast.fm And keep adding to The Supermassive Mailbox with your pictures and questions for the team. Send them to podcast@ras.ac.uk or follow them on Instagram, @SupermassivePod. The Supermassive Podcast is a Boffin Media production for the Royal Astronomical Society. The producers are Izzie Clarke and Richard Hollingham. Hosted on Acast. See acast.com/privacy for more information.

Episodes

July 18, 2025 12 mins

What would happen if asteroid Bennu impacted Earth? Can we timelapse Saturn's rings developing? Where are Earth's rings? Plus the solar wind on Mars... The Supermassive team answer YOUR questions.


Keep sending questions to podcast@ras.ac.uk, on Instagram @SupermassivePod or join The Supermassive Club for ad-free listening and to support the show.


Hosted on Acast. See acast.com/priva...

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Izzie and Dr Becky decided that little ol’ Pluto doesn’t get much attention anymore. So we’re giving the dwarf planet some time in the spotlight. Why isn't Pluto a planet? How small is it? And what makes it so unique?


Thank you to Prof Alan Fitzsimmons from Queens University of Belfast joining us episode.


Join The Supermassive Club for ad-free listening and share you questions, images and more. Or email them to podcast@r...

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What would happen if planets collided at a snail's pace? How much of Avengers Endgame regarding time is scientifically acceptable? Why aren't stars closer together? And the team discuss a listener's theory to terra-form Mars.


Want to support the show? Join The Supermassive Club for exclusive content, star-gazing forums and ad-free listening... supermassive.supportingcast.fm


And keep adding to The Supermassive Mailbox wit...

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May 27, 2025 57 mins

Start your stopwatches, set your timers, turn back your clocks because Izzie and Dr Becky are talking time. What is it? How, and why, do we measure it? And is time real or a human construct?!


Izzie speaks with Anne Curtis at the National Physical Laboratory who works on one of the world’s most accurate clocks, and editor Richard has been to the very heart of time itself in Greenwich with Finn Burridge at the Royal Observato...

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May 13, 2025 16 mins

Should astronauts live underground on the Moon or Mars? Black hole jets, rogue planets, the big crunch (or freeze) and the Ontario question. Dr Becky, Izzie and Dr Robert Massey tackle your correspondence from the Supermassive mailbox and producer Richard makes a pronunciation intervention.


The book Becky mentions is Red Rising by Pierce Brown.


Keep sending in your wonderful ponderings. Email them to podcast@ras.ac.uk or via...

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April 23, 2025 53 mins

This episode is a weighty one. Some might say massive. It’s all about gravity. What is it? Why does it matter? Izzie and Dr Becky explore Einstein and Newton’s different ideas on the subject, plus Izzie visits the Royal Society to see Isaac Newton's original manuscript for his works on gravity and the laws of motion.


Special thank you to listener Hanna_m_e for suggesting this episode topic and to Professor Tessa Baker,...

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What the bloomin’ hell is a Gravastar? Are fast radio bursts like solar flares on steroids? Plus an interesting question on multiverses that can't be summed up in a short sentence. Izzie Clarke, Dr Becky Smethurst and Dr Robert Massey dive into The Supermassive Mailbox and take on your questions.


Keep sending in your wonderful ponderings. Email them to podcast@ras.ac.uk or via Instagram @Supermassivepod


The Supermassive Podc...

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Climb aboard The Supermassive Rocket, Izzie and Becky are (talking about) sending humans back to the moon. Joining them on their trip is European Space Agency astronaut Matthias Maurer and Jacki Mahaffey, the Chief Training Officer for NASA’s Artemis II mission. Plus, Dr Robert Massey, the Deputy Director of the Royal Astronomical Society, is there as well to answer your questions and share his top stargazing tips.


For...

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March 11, 2025 12 mins

If black holes are so dense, how can gamma rays jet shoot out from it? At what point in space does our sun become invisible to the naked eye? And a question about CubeSats, black holes and detecting alien civilisations... It time for Izzie Clarke, Dr Becky Smethurst and Dr Robert Massey to take on your questions!


Got a question to add to The Supermassive Mailbox? Email it to podcast@ras.ac.uk or message us on Instagram, @Su...

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This time Dr Becky Smethurst and Izzie Clarke discover why it’s touch and go when it comes to returning asteroid samples to Earth and hear how we’ve been exchanging spit with Mars since the dawn of the Solar System.

 

The team is joined by Dr Sara Russell, a meteorite researcher at the Natural History Museum in London, and Dr Albert Haldemann, Mars Chief Engineer for the European Space Agency.

 

As ever, Dr Robert Massey is...

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February 18, 2025 13 mins

Scientists have detected an asteroid that has a small chance of hitting Earth. Resident expert Dr Robert Massey tells Izzie Clarke and Richard Hollingham why we shouldn't be worried.


Want to suggest a topic to the team? Contact podcast@ras.ac.uk or find us on Instagram @SupermassivePod.


The Supermassive Podcast is a Boffin Media production. The producers are Izzie Clarke and Richard Hollingham


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What are the implications on space exploration with a change of president? Did cosmic inflation come before the Big Bang? Are there sonic booms in space? Izzie, Becky and Robert take on your questions! 

Keep sending your questions to podcast@ras.ac.uk or find us on instagram @SupermassivePod. 

Hosted on Acast. See acast.com/privacy for more information.

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January 28, 2025 55 mins
Hosts Izzie Clarke and Dr Becky Smethurst are starting 2025 with a biggie. The scientific search for extraterrestrial life: 

Where are scientists looking? How do they search for potential signals? And what the heck is the plan if they find one?! The Supermassive team hears from Seth Shostak from the SETI Institute about the search for life beyond Earth, and Dr John Elliot from the University of St Andrews explains what would...

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December 20, 2024 53 mins
Our final episode of 2024 is a SUPERMASSIVE Q&A. 

Izzie Clarke, Dr Becky Smethurst and Dr Robert Massey make their way through your questions.  What’s the farthest star we can see with the naked eye? Why do black holes expand and shrink? And what would happen if we accelerated an uncompressed medium sized potato to 99% the speed of light? 

And remember, do not confuse the ISS with Santa's Sleigh in the run up to C...

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From planetary alignment through the galaxy to spacetime expansion, The Supermassive Team answer your questions.

Keep sending us your questions, email us on podcast@ras.ac.uk or find us on instagram @SupermassivePod

Hosted on Acast. See acast.com/privacy for more information.

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December 4, 2024 40 mins
The Supermassive Team are investigating strange blasts of energy in space called Fast Radio Bursts. What are they and where do they come from? Dr Stuart Ryder from Macquarie University in Australia joins Izzie, Dr Becky and Robert to help explain. 

Christmas Present Ideas 
  • Astronaut Chris Hadfield’s talk - A Journey into The Cosmos
  • Astronomy Photographer of the Year exhibition at Royal Museums Greenwich
  • Telescope SeeS...
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November 18, 2024 17 mins
... Potentially the silliest bonus episode we've ever recorded. 

The Supermassive Team takes on your questions; What are Brown Dwarfs? How can photons have different energies? Do frozen stars exist? And they get extremely distracted by the concept of nuclear pasta. Even Producer Richard gets involved. 

Here's the paper mentioned by listener Hanna, Thermodynamics of Frozen Stars

The Supermassive Podcast is a Bof...

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November 5, 2024 48 mins
From pulsating stars to those with diamond cores, Izzie and Dr Becky are exploring weird and wonderful stars. What are the different types of stars in our universe? And what are the oddballs? Plus Dr Robert Massey is here for your top stargazing tips.

With thanks to Professor Andrew Norton from the Open University for joining the team this episode.

Keep sending your brilliant questions and photos to podcast@ras.ac.u...

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October 18, 2024 31 mins
Auroras, and comets, and launches... Oh my! Izzie Clarke, Dr Becky Smethurst, and Dr Robert Massey run through a MEGA month for the astronomy community. Plus, there's just enough time to squeeze in a few listener questions. 

Here's our recommendations on news or journals sites to keep up with all things space and science: 

space.com
Universe Today
Astronomy Now
Sky at Night
Sky and Telescope
NASA
ESA...

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October 1, 2024 43 mins
Izzie and Dr Becky are untangling the cosmic web - the large scale structure of the universe - with help from Dr Chiara Mingarelli from Yale University. What the heck is it? What do we know about it? And can we use gravitational waves to "see" it? Plus, Dr Robert Massey is on hand to answer your questions.

Got a question for the team? Contact us on podcast@ras.ac.uk or find us on Instagram, @SupermassivePod.

The Sup...

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