Space Nuts: Astronomy Insights & Cosmic Discoveries

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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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Space Nuts: Q&A on BepiColombo, Neutrinos, and Time Dilation
In this Q&A edition of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson dive into a series of intriguing listener questions that span topics from the nuances of orbital velocity to the enigmatic world of neutrinos and the complexities of time dilation. Join them as they unravel these cosmic queries with their signature blend of insight and humour.
Key topics
- Larry from Nebraska asks about the BepiColombo mission and the relationship between gravitational assists and orbital velocity, prompting a discussion on how spacecraft navigate the solar system.
- Eduardo explores the nature of neutrinos, questioning whether they are affected by gravity and whether they can be trapped by black holes.
- Shumo presents a thought-provoking idea about using high-energy gamma rays or neutrinos as interstellar beacons, leading to a discussion on the potential for advanced civilisations to communicate through unconventional means.
- Colin from Adelaide raises questions about time dilation effects as depicted in the science fiction movie "Project Hail Mary," specifically the implications of travelling close to the speed of light and the resulting age differences upon return to Earth.
Timestamps
00:00 - Introduction to the Q&A format and listener interactions
01:20 - Larry's question about BepiColombo and gravitational assists
10:30 - Eduardo's inquiry on neutrinos and black holes
18:45 - Shumo's question about interstellar beacons using gamma rays or neutrinos
26:00 - Colin's confusion about time dilation in "Project Hail Mary"
32:15 - Discussion on the implications of time dilation and relativity

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Space Nuts: Venus’s Missing Moon, Satellite Pollution, and Space Force Uniform Controversy
Space Nuts covers three very different space stories in this episode, ranging from planetary science to the consequences of satellite reentry and a controversial military uniform design. Andrew Dunkley and Professor Fred Watson also field listener questions on orbital mechanics, neutrinos, alien communication, and time dilation.
The discussion is broad, but the main thread is clear: how real-world physics shapes everything from Venus’s history to the future of spaceflight and even the look of space-age uniforms.
Key topics
Venus is Earth-like in size, mass, and gravity, but unlike Earth it has no moon, and the episode explores whether it may once have had one.
Fred explains a modeling study led by Stephen Kane suggesting a Venus moon could have spiraled inward, crossed the Roche limit, and been torn apart by tidal forces.
The team discusses what evidence might remain if Venus once consumed a moon, including possible chemical fingerprints in the atmosphere or surface.
Satellite pollution is examined through the lens of reentering spacecraft, especially the growing number of Starlink reentries and their impact on the upper atmosphere.
The European Space Agency’s jet-based chase of two reentering Cluster spacecraft, Tango and Samba, is described as an effort to measure reentry byproducts directly.
The conversation raises concerns about aluminium oxides, atmospheric chemistry, and whether repeated reentries could have broader consequences such as ozone depletion.
The final main story looks at proposed United States Space Force uniforms and why the design drew immediate comparisons to World War II-era fascist aesthetics and Starship Troopers.
Andrew and Fred note how uniform design can shape perception, and why the new concept feels divisive rather than inspiring.
Timestamps
00:00 - Intro and setup for the episode
00:41 - Venus, satellite pollution, and Space Force uniforms preview
04:40 - Venus as Earth’s twin and why it has no moon
08:21 - Modeling a missing Venusian moon
09:20 - Gravitational tug-of-war and moon migration toward Venus
11:44 - Conditions for a moon to survive around Venus
12:43 - Possible traces of an ancient moon impact
16:06 - Satellite pollution from reentering spacecraft
17:16 - Starlink reentries and atmospheric contamination
18:14 - ESA’s jet chase of reentering Cluster spacecraft
20:06 - Observing Tango and Samba during controlled reentry
21:45 - Why the atmospheric consequences could become controversial
23:12 - Wood as a potentially more benign spacecraft material
24:16 - Space Force uniforms and the first visual reaction
25:34 - Starship Troopers and deliberate fascist design cues
27:29 - Why the proposed uniforms feel unsettling

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