Space Nuts: Astronomy Insights & Cosmic Discoveries

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Space Nuts: Vanishing Stars, White Holes, Earth’s Mass and Neutrinos
In this listener Q&A episode of Space Nuts, Andrew Dunkley and Professor Fred Watson tackle four cosmic questions that stretch from distant stars to the nature of space-time. They explain why a star billions of light-years away would still appear in our sky long after it had gone out, and why looking across the universe means looking back through time. Next, they consider whether white holes are the opposite of black holes, then investigate whether dark matter could affect our measurements of Earth’s mass and gravity. Finally, they explore how neutrinos interact with gravity, whether black holes can capture them, and why space-time itself is not something a black hole can consume. Join Andrew and Fred Watson Watson for big ideas, listener curiosity and the occasional detour into the value of the Earth in dollars.
Key topics
- How light-travel time means we see distant stars as they were in the past.
- White holes as theoretical solutions to relativity, and how they differ from black holes.
- Whether dark matter contributes to Earth’s measured gravity and mass.
- The mass of the Earth and how astronomers determine it.
- Neutrinos, gravity, black holes and whether space-time can be consumed.
Timestamps
00:00 - Introduction and listener questions
01:30 - If a distant star goes out, when would we see it happen?
06:30 - Looking back in time across the observable universe
10:00 - What are white holes, and are they the opposite of black holes?
15:30 - Could dark matter affect measurements of Earth’s gravity?
20:30 - How the mass of Earth is determined
23:30 - Do neutrinos interact with gravity, and can black holes capture them?
27:00 - Could a black hole feed on space-time itself?
30:00 - How to send questions to Space Nuts and closing remarks

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Space Nuts: A New Dwarf Planet, 3I/ATLAS, and Neptune’s Hidden Trojans
In this episode of Space Nuts, Andrew Dunkley and Professor Fred Watson explore three discoveries from across the Solar System and beyond. They begin with the Vera C. Rubin Observatory’s discovery of a distant, potentially large dwarf planet, and discuss what its unusual orbit could tell us about the hunt for the elusive Planet Nine. Next, they examine new James Webb Space Telescope observations of interstellar comet 3I/ATLAS, whose unusual chemistry may preserve clues to its origins in a very cold environment billions of years ago. Finally, the hosts turn to Neptune’s long-sought Trojan asteroids, discovered in data from the Rubin Observatory by a team in Belfast. Join Andrew and Fred Watson for distant worlds, ancient cosmic ice and asteroids hiding in the dark.
Key topics
- The Vera C. Rubin Observatory’s discovery of dwarf planet candidate 2026 ED138.
- What makes an object a dwarf planet, and how its orbit could inform the Planet Nine debate.
- 3I/ATLAS’s unusual isotope ratios, methane and possible origins in an ancient, cold environment.
- The discovery of Neptune’s Trojan asteroids and why they have been so difficult to observe.
Timestamps
00:00 - Introduction and episode overview
01:20 - The Vera C. Rubin Observatory discovers a new distant dwarf planet
05:30 - What defines a dwarf planet and how it may eventually be named
09:00 - The object’s size, unusual orbit and possible relevance to Planet Nine
12:00 - 3I/ATLAS and its unusual chemistry revealed by the James Webb Space Telescope
16:00 - Isotope ratios, methane and clues to the comet’s age and origins
20:00 - Neptune’s Trojan asteroids are finally discovered
24:00 - How Trojan asteroids share a planet’s orbit and why Neptune’s were hard to find
27:00 - Closing remarks and where to follow Space Nuts

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Space Nuts: The Great Attractor, What Makes a Moon, and Life Beneath the Rings
In this listener Q&A episode of Space Nuts, Andrew Dunkley and Professor Fred Watson tackle a curious collection of cosmic questions. They explain why a crescent Moon can appear alongside the Sun in the morning sky, then explore the Great Attractor: the enormous concentration of galaxy clusters influencing the motion of our Local Group. The conversation turns to a lingering classification puzzle — what exactly makes a moon a moon, and should it have to clear its orbit? Finally, they imagine the view from a rocky world with rings, considering how the rings might look through the seasons, how sunlight would filter through them and what spectacular shadows or eclipses might occur. Join Andrew and Fred Watson for astronomy, imagination and the occasional tractor joke.
Key topics
- Why the Sun and a crescent Moon can be visible together in the morning sky.
- The Great Attractor, the Zone of Avoidance and the Laniakea Supercluster.
- Whether moons need to be spherical or clear their orbits, and the case of Pluto and Charon.
- What a ringed planet might look like from its surface, including seasonal changes, shadows and eclipses.
Timestamps
00:00 - Introduction and overview of listener questions
01:20 - Why the Sun and crescent Moon can appear together in the morning
06:00 - Moon phases and how sunlight illuminates the Moon
09:30 - Paul’s question about the Great Attractor
11:00 - The Zone of Avoidance and the Laniakea Supercluster
16:00 - What defines a moon, and should it clear its orbit?
20:00 - Binary planets, Pluto and Charon
23:00 - What it might look like to stand beneath a planet’s rings
26:00 - Seasonal ring illumination, shadows and possible eclipses
30:00 - Listener feedback, updates and closing remarks

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Space Nuts: Mars’ Moons, Martian Quakes, and the Search for ET
In this engaging episode of Space Nuts, Andrew Dunkley and Professor Fred Watson explore two mysteries from Mars, along with a new effort to listen for signs of life beyond Earth. First, they unpack Japan’s Martian Moons eXploration (MMX) mission, which will study Phobos and Deimos, attempt a landing on Phobos and bring samples back to Earth. The discussion turns to a Marsquake traced to the immense Valles Marineris canyon, offering fresh clues that the Red Planet may still be geologically active. Finally, Andrew and Fred Watson examine Saudi Arabia’s plans for a major astronomical observatory, including a site for Laser SETI detectors searching for brief flashes of possible extraterrestrial communication. Join them for a cosmic tour filled with planetary puzzles, ambitious missions and a little speculation about how aliens might get in touch.
Key topics
- Japan’s MMX mission to investigate Mars’ moons and return samples from Phobos.
- The possible origins of Phobos and Deimos, and the challenges of landing on a world with almost no gravity.
- A Marsquake linked to Valles Marineris and what it suggests about the planet’s geological activity.
- Saudi Arabia’s planned observatory and the use of optical Laser SETI detectors in the search for extraterrestrial signals.
Timestamps
00:00 - Introduction and episode overview
01:20 - Japan’s MMX mission and the mysteries of Phobos and Deimos
06:00 - How the mission will study Phobos and attempt to collect samples
12:00 - The challenges of landing on Phobos and the planned sample return to Earth
15:45 - A Marsquake traced to Valles Marineris
19:30 - What the quake reveals about Mars’ geological activity
22:00 - Saudi Arabia’s new observatory and the Laser SETI search
26:00 - How optical detectors could look for signals from extraterrestrial intelligence
29:00 - Closing thoughts and listener engagement

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Space Nuts: Ejected Stars, Black Hole Deaths, and Astronomy Resources
In this engaging Q&A episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson tackle a variety of intriguing questions from listeners. The episode kicks off with Clark from Auckland, who wonders about the possibility of stars and planets being ejected from galaxies, and what that means for rogue celestial bodies. Next, Scott from Hobart delves into the life cycle of black holes, asking what happens when they can no longer hold back light and how they ultimately meet their end. Rusty from Brooklyn poses a thought-provoking hypothetical scenario about the sun disappearing and its effects on Earth's gravitational tether. Finally, Bea from Sydney seeks advice on resources for beginners in astronomy, prompting a discussion on apps, books, and equipment to kickstart a cosmic journey. Join Andrew and Fred Watson as they explore these cosmic curiosities with their signature blend of wit and insight.
Key topics
- The mechanics of stars and planets being ejected from galaxies and the existence of rogue celestial bodies.
- Understanding the final stages of black holes, including Hawking radiation and potential explosive endings.
- The implications of the sun's sudden disappearance on Earth's gravitational stability.
- Resources and tips for beginners looking to dive into the world of astronomy.
Timestamps
00:00 - Introduction and overview of listener questions
01:20 - Clark’s question about ejected stars and planets from galaxies
15:30 - Scott’s inquiry on the life cycle and death of black holes
25:00 - Rusty’s hypothetical scenario about the sun disappearing
35:15 - Bea’s request for beginner astronomy resources
45:00 - Closing thoughts and listener engagement

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00:00 - Introduction to Space Nuts and Listener Questions About Ejected Planets and Black Holes
01:56 - Can Planets and Stars Be Ejected From a Galaxy and the Nature of Intergalactic Space
04:24 - Understanding Stellar Ejection Mechanisms and Measuring Galactic Escape Velocity
07:37 - Comparing Earth's Escape Velocity to Our Galaxy's and the Impact of Galactic Mergers
09:04 - Analogy of Bank Mergers to Galactic Mergers and Universe Dynamics
09:50 - Exploring Black Hole Evaporation Through Hawking Radiation and the Final Violent Burst
11:17 - The Inverse Relationship Between Black Hole Mass and Temperature Leading to Evaporation
14:09 - Theoretical End States of Black Holes Including Gravitational Shockwaves and Information Release
15:13 - Summarizing Black Hole Endings and Thanking Listeners for Thought-Provoking Questions
15:44 - What Happens if the Sun Instantly Disappears and the Speed of Gravity
19:56 - Writing a Prequel and Speculating on Threats to Earth and Solar System Stability
21:11 - Concluding Questions and Addressing Beginner Astronomy Resources
21:43 - Recommended Astronomy Resources Including Podcasts, Websites, and Sky Apps
23:06 - Using Binoculars and Telescopes for Sky Observation and Visiting Astronomy Optics Stores
24:30 - The Value of Planispheres and Considering a Smart Telescope for Modern Astronomy
26:07 - Smart Telescopes with Built-in Filters and AI Image Enhancement Capabilities
27:26 - Enhancing Astronomical Images with AI Software and Affordable Smart Telescope Options
29:04 - Concluding the Episode and Discussing Time Dilation and Future Episodes
30:11 - A Humorous Ejection Analogy and Farewell from Space Nuts Hosts
30:42 - Podcast Availability and Production Credits for Space Nuts