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Space Nuts: Venus’s Missing Moon, Satellite Pollution, and Space Force Uniform Controvers y

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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First starlight from Roman, a shorter fuse on the Solar System, weapons in orbit, and a globular cluster hiding behind the dust Roman opens its eye — and finds it has twice as long to look NASA has activated the Nancy Grace Roman Space Telescope's Wide Field Instrument, a 300-megapixel infrared camera built around eighteen detectors, with a field of view at least a hundred times larger than Hubble's infrared field — a patch of sky bigger than the full Moon in a single exposure, at Hubble-comparable sharpness. The instrument reached its operating temperature of −143 °C on 11 September; detectors and the calibration system came up across the 11th and 12th; the element wheel turned in microgravity for the first time on the 12th; the focus mechanism was verified on the 13th. Roman then took its first starlight image — deliberately out of focus, and exactly as intended: a baseline diagnostic that proves the optical path is clear and every detector is live. Sharp science images are expected by early 2027. The Coronagraph Instrument has completed initial communications checkout from Caltech/IPAC and is running 30-day decontamination cycles at room temperature. Separately, NASA published the numbers from Roman's first mid-course correction: better than 99% accurate, using about 18 kg of a 200 kg propellant budget, on a spacecraft that launched lighter than its allowance. Jamie Dunn (Goddard): Roman has fuel for at least 22 years of potential science operations, against a design life of ten. Caveat kept on air: that is a fuel figure, not a funding or hardware figure. Why it matters: Roman's High-Latitude Time-Domain Survey measures cosmic expansion with Type Ia supernovae, and its High-Latitude Wide-Area Survey probes cosmic acceleration across more than 5,000 square degrees through weak lensing and galaxy clustering — two independent handles on the dark energy question that Monday's Australian-led supernova compilation sharpened but could not settle. A doubled mission means a longer lever arm in time, which in this measurement is everything. Caltech: the Solar System's dynamical fuse is far shorter than we thought Konstantin Batygin, Jim Fuller and Fred Adams (Caltech), 'Terminal instability of the Solar System triggered by stochastic solar mass loss', arXiv:2609.12494, posted 11 September and accepted to the Astrophysical Journal Letters. The standard estimate for how long the giant planets hold their architecture — about 10¹⁸ years — assumes the dying Sun sheds mass smoothly. Observations of white-dwarf recoil indicate mass is instead lost in discrete, independently directed ejections, so planetary orbits take a random walk. In simulations, roughly 40% of systems are disrupted or violently scattered before white dwarf formation and about 90% within ~3 billion years after, cutting the outer Solar System's dynamical lifetime to around a gigayear past white dwarf formation. Framed on air as a prediction to test — planetary systems around old white dwarfs should be rarer and more chaotic — with the granularity of the mass loss named as the number to go and measure. The United States says, for the first time, that it has weapons in orbit Secretary of the Air Force Troy Meink, speaking on the opening day of the Air & Space Forces Association's Air, Space & Cyber Conference at National Harbor, Maryland on Monday 14 September: the United States now has 'on-orbit space control weapons capable of defending the joint force against hostile adversary actions'. It is the first public US acknowledgement of offensive capability in orbit. No systems, numbers, locations or timelines were disclosed. A Space Force spokesperson defined space control as employing 'kinetic and non-kinetic means to affect adversary capabilities through disruption, degradation and even destruction, if necessary'. Gen. Douglas Schiess, Chief of Space Operations, said the following day that 'it was time' to talk about it, citing Chinese and Russian anti-satellite advances. Covered factually, with both the deterrence and the arms-control readings presented, and with orbital debris as the physical consequence that outlasts any dispute. Australian context: Operation Olympic Defender and Defence Space Command. Rubin finds a globular cluster hiding behind the dust Aashay Pai, William Cerny, Andrew Pace, Alex Drlica-Wagner and colleagues, 'Rubin Observatory Reveals a Dust-Shrouded Halo Globular Cluster in Ophiuchus', arXiv:2609.15872, posted 14 September. Rubin-GC1 was found in Rubin's Early Data Preview 2 — not the survey proper — in the direction of the galactic bulge, behind heavy dust and a crowded foreground. It sits about 31 kiloparsecs away, roughly 100,000 light-years, out in the Milky Way's halo. Half-light radius ~5 pc, absolute magnitude ≈ −2.4, placing it in the faint tail of the globular cluster luminosity function; age ≈ 9.2 billion years; moderately metal-poor. Gaia DR3 proper motions and phase-space modelling point to an origin in the...

SpaceTime Series 29 Episode 111 27 new Trans Neptunian Objects discovered in the outer solar system The first ever joint observation of Trans Neptunian objects by NASA’s Hubble and Webb space telescopes has discovered 27 new worlds in the dark outer reaches of the solar system. A decagon discovered at Saturn's south pole New observations by NASA's Hubble Space Telescope have revealed a giant, evolving, 10-sided decagon atmospheric structure encircling Saturn's south pole. LINK’s failed rescue mission scopes its target but can’t save it The LINK spacecraft which was meant to rescue NASA's doomed Swift Gamma Ray space Telescope (https://phys.org/news/2026-06-nasa-swift-telescope-falling-earth.html) has now reached to within 15 kilometres of Swift and has even managed to take some images of the stricken observatory. The Science Report The latest data on HIV and sexually transmitted diseases in Australia paints a mixed picture. Climate change forcing a decline in global sea weed forests. Asian elephants shown to resist impulsive behaviour in favour of rational problem solving. The artificial-intelligence chatbot Claude cracks Fermat’s last theorem. Alex on Tech the phone duo.

Our Guests This Week Dr Fred Jourdan from Curtin University ESA BepiColombo Project Scientist Johannes Benkhoff DLR Planetary Scientist Jorn Helbert Our regular guests: Alex Zaharov-Reutt from techadvice.life Tim Mendham from Australian Skeptics 🌏 Get Our Exclusive NordVPN deal here ➼ www.bitesz.com/nordvpn (http://www.bitesz.com/nordvpn) . The discounts and bonuses are incredible! And it’s risk-free with Nord’s 30-day money-back guarantee! ✌ If you’d like to support the podcast and gain access to bonus content by becoming a SpaceTime crew member, you can do just that through The Big Bang editions on Patreon, Spotify and Apple Podcasts. Details on the Support page on our website https://www.bitesz.com/show/spacetime/support/ (https://www.bitesz.com/show/spacetime/support/)

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SpaceTime Series 29 Episode 110 Lunar far side rocks rewriting history A new study claims the timing and intensity of asteroid bombardment across the lunar surface declined gradually, rather than being a short, intense burst of impacts as previously thought. The crystals that might have made Snow Ball Earth worse A new study claims planet Earth may have been pushed deeper into a global deep freeze known as snowball Earth by something as ordinary as salt. Meteor strike reported off the Western Australian coast The European Space Agency’s Near Earth Objects co-ordination centre has reported a meteor impact in the Indian Ocean off the coast of north western Australia. The Science Report Warnings of a ten percent chase that AI could cause human extinction within the next decade. The world enters a new era of artificial general intelligence with the release of GPT-6 Astra. A new study has shown that Psychiatrists agree on a diagnosis in only 55% of cases. The 2026 Ig Nobels handed out in Switzerland showing what happens to old undies. Skeptics guide to the truth about surveys.

Our Guests This Week Dr Fred Jourdan from Curtin University ESA BepiColombo Project Scientist Johannes Benkhoff DLR Planetary Scientist Jorn Helbert Our regular guests: Alex Zaharov-Reutt from techadvice.life Tim Mendham from Australian Skeptics 🌏 Get Our Exclusive NordVPN deal here ➼ www.bitesz.com/nordvpn (http://www.bitesz.com/nordvpn) . The discounts and bonuses are incredible! And it’s risk-free with Nord’s 30-day money-back guarantee! ✌ If you’d like to support the podcast and gain access to bonus content by becoming a SpaceTime crew member, you can do just that through The Big Bang editions on Patreon, Spotify and Apple Podcasts. Details on the Support page on our website https://www.bitesz.com/show/spacetime/support/ (https://www.bitesz.com/show/spacetime/support/) For more SpaceTime and show links: https://linktr.ee/biteszHQ (https://linktr.ee/biteszHQ) If you love this podcast, please get someone else to listen too. Thank you…

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An Australian-led team has rebuilt thirty years of supernova observations into one consistent catalogue — and it adds fresh weight to the idea that dark energy is not constant. We also ask whether the young Sun swallowed a super-Earth, find out why a quiet Sun is bad news at thirty-five thousand feet, and watch JWST run the most sensitive exomoon search ever attempted. Plus a Crew-13 update and a skywatch with a live aurora alert for both hemispheres. In this episode · Two thousand, eight hundred and eighty-four Type Ia supernovae, rebuilt from Pantheon+ and the Dark Energy Survey's full five-year sample into a single internally consistent catalogue by Ryan Camilleri and Professor Tamara Davis at the University of Queensland, with ANU, Swinburne and international colleagues. · On their own the supernovae give a matter density of 0.310 for flat ΛCDM. Combined with the CMB and baryon acoustic oscillations, a tension appears under constant dark energy — and eases when dark energy is allowed to evolve. Preference: 2.5–3.1 sigma. · Why that is interesting but not a discovery, and why a second independent line of evidence pointing the same way as DESI changes the shape of the argument. · Professor Mutlu Yildiz (Ege University) on whether the young Sun engulfed a planet of 5–10 Earth masses — and whether that single event explains both the solar sound-speed discrepancy and the Sun's missing lithium. · Yaniv, Yair and Price on six balloon flights to 35 km: cosmic radiation at cruising altitude runs 40–60% higher at solar minimum, with an anticorrelation of r = −0.71 against solar activity. · David Kipping stacks twelve JWST transits of LP 890-9c and excludes moons down to 0.1 Earth radii across the entire Hill region — the most sensitive exomoon search on record. · Crew-13 now targeting no earlier than late September after an oxidiser leak in Dragon's propulsion system. · Skywatch: a coronal-hole stream arriving today with aurora chances at both ends of the planet, Venus at greatest brilliancy on 18 September, Mars past Pollux, Saturn towards opposition, International Observe the Moon Night on the 19th, and the equinox on the 22nd. Sources · University of Queensland — 'Big supernova dataset challenges dark energy theory', 8 September 2026 · Camilleri, Lee, Davis, Rubin, Shah, Scolnic, Lidman et al., 'Supernovae Unite: Combining Pantheon+ and DES-SN5YR', Publications of the Astronomical Society of Australia — arXiv:2609.05053; companion host-mass paper arXiv:2609.05321 · Royal Astronomical Society — ''Fingerprints' inside the Sun could reveal if it once swallowed a planet', 10 September 2026. Yildiz, MNRAS, DOI 10.1093/mnras/stag1527 · Yaniv, Yair & Price, Journal of Geophysical Research: Atmospheres, September 2026 — cosmic radiation at aviation altitudes across the solar cycle · Kipping, 'JWST Excludes Exomoons Down to 0.1 Earth Radii Around a Rocky, Temperate Exoplanet', arXiv:2609.05301, 4 September 2026 · NASA Space Station blog — 'NASA, SpaceX Adjust Crew-13 Launch Date', 29 August 2026; Canadian Space Agency update, September 2026 · EarthSky sun news and NOAA Space Weather Prediction Center outlooks, 12–14 September 2026 · NASA Science — 'What's Up: September 2026 Skywatching Tips'

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