Space Nuts: Astronomy Insights & Cosmic Discoveries

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Space Nuts: Unraveling the Mysteries of NGC 4698 and Chariklo's Rings
In this exciting episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson explore some truly peculiar cosmic phenomena. They kick off with a deep dive into the strange behaviour of the galaxy NGC 4698, known for its unusual rotational patterns and mysterious bulge, leading to discussions about possible galactic mergers. Next, the duo ventures into the intriguing world of Chariklo, a centaur object with changing rings, as they discuss the latest observations from the James Webb Space Telescope and the implications of its unique ring structure. Join Andrew and Fred Watson as they navigate these captivating astronomical tales with their signature blend of humour and insight.
Key topics
- The peculiar characteristics of NGC 4698: What makes this galaxy behave strangely?
- Insights into the dynamics of galaxy mergers and their effects on structure.
- Chariklo's rings: How have they changed since their discovery, and what does this mean for our understanding of ring systems?
- The potential existence of a hidden moon influencing the structure of Chariklo's rings.
Timestamps
00:00 - Introduction and overview of today's topics
01:20 - Discussion on the peculiar galaxy NGC 4698 and its unusual features
15:30 - Exploring Chariklo and the changes in its ring system
25:00 - Insights from the James Webb Space Telescope and the hidden moon hypothesis
35:15 - Final thoughts and listener engagement

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Space Nuts: Time Travel, Orbiting Telescopes, and Gold Origins
In this Q&A episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson tackle a range of thought-provoking listener questions. They begin with a fascinating inquiry from Andy, a train driver in the UK, about the implications of time travel at relativistic speeds. What does it mean to age differently when travelling close to the speed of light? The duo then dives into the mechanics of orbiting telescopes, addressing Nick's questions about how these instruments manage their observations while minimising interruptions from Earth. Finally, Ash from Brisbane poses an intriguing question about the origins of gold, prompting a discussion on neutron star collisions and the cosmic processes that create heavy elements.
Key topics
- Time travel and the effects of relativistic speeds on aging: Can we really travel through time?
- The scheduling and operational strategies of orbiting telescopes like Hubble: How do they maximise observation time?
- The origins of gold in the universe: What role do neutron star collisions play in the creation of heavy elements?
Timestamps
00:00 - Introduction and overview of listener questions
01:20 - Andy’s question on time travel and relativistic speeds
15:30 - Nick’s inquiry about orbiting telescopes and their observation strategies
25:00 - Ash’s question regarding the origins of gold and neutron star collisions
35:15 - Final thoughts and listener engagement

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Space Nuts: Space Force Weapons, Purple Mars, and New Lunar Crater
In this episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson delve into some fascinating and thought-provoking topics. They kick off with the recent revelation about the existence of weapons in orbit around Earth, a significant admission from the United States that raises questions about the future of space security. The conversation shifts to Mars, where stunning new images suggest that we might need to reconsider its nickname as the "Red Planet" due to striking purple hues observed in its southern regions. Finally, the duo discusses a newly discovered crater on the Moon, the largest of its kind in recent history, and what this means for our understanding of lunar impacts and surface changes.
Key topics
- The United States acknowledges the presence of weapons in space, sparking discussions about the implications for global security and the arms race in orbit.
- An exploration of Mars' changing colour palette, with new images revealing purple landscapes that challenge our traditional views of the planet.
- The discovery of a significant new crater on the Moon, highlighting the ongoing geological activity and impact history of our celestial neighbour.
Timestamps
00:00 - Introduction and overview of topics
01:20 - Discussion on weapons in orbit and implications for space security
15:30 - Mars as the "Purple Planet" and the significance of new imagery
25:00 - New lunar crater discovery and its implications for lunar geology
35:15 - Closing thoughts and listener engagement

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Space Nuts: Q&A on Radial Velocity, Dark Matter, and Angular Momentum
In this engaging Q&A episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson tackle a variety of intriguing listener questions, ranging from the complexities of radial velocity in exoplanet detection to the mysteries of dark matter and angular momentum in black holes. Join them as they explore these cosmic conundrums with their characteristic wit and expertise.
Key topics
- Hussein from Yemen asks about the radial velocity method for detecting exoplanets, prompting a discussion on how astronomers can isolate individual planets from the combined gravitational effects of multiple bodies.
- Martin from Maryland raises a thought-provoking question on the potential to harness dark energy for space flight, leading to an exploration of the feasibility of accelerating spacecraft to near-light speeds.
- Peter from Sweden inquires about the angular momentum of matter falling into black holes, sparking a conversation on whether this matter retains its momentum or needs to shed some energy before crossing the event horizon.
- Andrew and Fred Watson also touch on the ongoing search for Planet Nine and the importance of surveying exoplanets for understanding the universe's structure and potential for life beyond Earth.
Timestamps
00:00 - Introduction to the Q&A format and listener questions
01:20 - Hussein's question about radial velocity and exoplanets
10:30 - Martin's inquiry on harnessing dark energy for space travel
18:45 - Peter's question about angular momentum and black holes
26:00 - Discussion on the significance of ongoing exoplanet surveys
32:15 - Closing thoughts and listener engagement

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Perseverance drove to the edge of an ancient Martian lake expecting a beach and found the inside of a volcano — rock that water has been through at least three separate times. Europe's Jupiter probe comes home on Monday night and crosses Australia in a fully dark sky. Two teams, using two completely different techniques, both find something hiding inside the most famous planetary system we have ever photographed — and an Australian instrument is in the middle of one of them. Plus: heavy water in an interstellar comet, and what it says about the star that made it. In this episode ·         LEAD — Three floods at the crater's edge. Candice Bedford (Purdue) and colleagues publish in Communications Earth & Environment: the Margin Unit at Jezero is igneous, not sedimentary, and records at least three distinct episodes of water — CO₂-rich groundwater making carbonate ridges, then silica associated with the lake, then a later hot-water event leaving fluorite veins. Habitability context, not a biosignature. ·         Juice returns. ESA confirms the third Earth gravity assist for 28 September — closest approach 11:45 UTC over the Indian Ocean, bending the trajectory ~20° and adding ~3.5 km/s. The spacecraft crosses Australia north-east to north-west 15–30 minutes earlier, in full darkness. ·         HR 8799. Two preprints in two weeks point at a fifth, inner planet — one from archival JWST aperture-masking data (~7 au, a few Jupiter masses), one from Gaia astrometry (2–3 au, 10–14 Jupiter masses). They do not obviously describe the same object. Neither is peer-reviewed. ·         3I/ATLAS. A modelling paper explains the high deuterium-to-hydrogen ratio measured in March as consistent with formation around a low-metallicity — meaning old — star. ·         Quick hit: Starship Flight 14 still targeting 28 September; Crew-13 still 'no earlier than early October' on NASA's own page; Albania signs the Artemis Accords as the 73rd country. ·         Skywatch: the equinox as an instant rather than a date, the Juice pass over Australia, Venus and Mercury for the south, Mars and Jupiter before dawn for the north, and Saturn heading into opposition. Sources and further reading ·         Bedford, C. C. et al., 'Lake- and groundwater-associated alteration of the olivine-rich Margin unit in Jezero crater, Mars', Communications Earth & Environment (2026). DOI 10.1038/s43247-026-03997-9 ·         NASA/JPL, 'NASA Discovery Reveals Complex Water Systems on Early Mars', 21 September 2026. ·         ESA, 'Juice to fly past Earth for third gravity assist', 21 September 2026. ·         Nguyen, J. S. et al., 'A Candidate Innermost Fifth Planet In the HR 8799 System Revealed By JWST NIRISS Aperture Masking Interferometry', arXiv:2609.10507. ·         Lagrange, A.-M. et al., 'A fifth companion in the HR 8799 system revealed by Gaia', arXiv:2609.20996 (submitted to Nature Astronomy). ·         Furuya, K., Cordiner, M., Bockelée-Morvan, D. et al., arXiv:2609.12370. ·         NASA OIIR, 'NASA Welcomes Albania as Newest Artemis Accords Signatory', 21 September 2026. Skywatch figures computed in-session with PyEphem 4.2.1 for Sydney, Los Angeles, New York and London. Times are local unless marked UTC.

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