Space Nuts: Astronomy Insights & Cosmic Discoveries

Space Nuts: Spanish Eclipse, Nancy Grace Roman Launch, Cloud Nine, and Venus's Mysterious Clouds
Andrew Dunkley and Professor Fred Watson cover four big astronomy stories in this episode, from Fred’s trip to view a sunset eclipse in Spain to the launch of the Nancy Grace Roman Space Telescope. They also unpack a starless dwarf galaxy called Cloud Nine and a new way of thinking about the strange dark material in Venus’s clouds.
Guests and speakers
Andrew Dunkley - Host, frames the news, asks listener questions, and guides the discussion.
Professor Fred Watson - Astronomer at large, explains the eclipse, the Roman telescope, Cloud Nine, and Venus’s clouds.
Key topics
In this episode, Fred recounts the Spanish eclipse expedition
The eclipse was only 9 degrees above the western horizon at totality, making the viewing conditions unusually challenging.
He and Marnie led a 16-person tour through France, Spain, and Switzerland before settling near Santander in northern Spain.
They staked out a viewing site 2 kilometers from the hotel, set up a gazebo, and had to tie it down to a car to keep it from blowing away.
The weather looked threatening, but a hole opened in the cloud just before totality, giving them a clear view of the corona.
Fred described the yellowish corona, pink hydrogen clouds, and the crowd of around 2,000 people.
We discuss the Nancy Grace Roman Space Telescope launch
Andrew watched the launch live after being nudged by his own brain at the right moment.
Fred noted the launch was flawless, with 27 Merlin motors firing.
The telescope is headed for the L2 Lagrange point, about 1.5 million kilometers away.
Roman is a 2.4-meter Hubble-class telescope but with 100 times the field of view.
Its wide-angle infrared design should enable major surveys of dark matter, dark energy, and exoplanets via its coronagraph.
Fred explains why Cloud Nine matters
Cloud Nine is described as a starless dwarf galaxy about 14 million light years away.
It lies near Messier 94 and was studied using the Gran Telescopio Canarias and its Hypercam instrument.
The deep exposure was 2.36 hours, yet the team found no convincing stellar population.
Fred says theory suggests the gas may be too hot to cool and collapse into stars because of the ultraviolet background radiation after reionization.
He says Cloud Nine may be the first strong example of a galaxy predicted by standard cosmology but never before clearly identified.
Venus’s clouds are still puzzling astronomers
Fred explains that Venus appears yellowish because we see the top of its cloud layer, especially in visible light.
In ultraviolet, Venus shows dramatic global cloud patterns caused by an as-yet unidentified absorber.
The new study uses radiative transfer modeling to constrain what the unknown absorber could be.
The team compares Venus’s cloud droplets to cigarette smoke, tiny particles that look light-colored when dispersed but could become dark sludge in bulk.
The result suggests the absorber must be very efficient, very concentrated, or both, but it is not being claimed as evidence of life.

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In this intriguing Q&A episode of Space Nuts, hosts Andrew Dunkley and Professor Jonti Horner tackle a variety of cosmic queries from listeners. Join them as they explore the fascinating world of radio telescopes and how they produce images from radio waves, delve into the complexities of gravitational waves, and ponder the sounds and smells of space.
Key topics include:
- How photographic images are generated from radio telescopes, despite only receiving radio waves, and the fundamental principles behind this technology.
- A deep dive into gravitational waves, their impact on space, and how LIGO detects these minute disturbances in the fabric of spacetime.
- An imaginative discussion on what sounds might exist in space and the potential smells one could encounter beyond Earth’s atmosphere, including the curious idea of cosmic fragrances.
Join Andrew and Jonty as they demystify these concepts, providing clarity and insights into the wonders of astronomy and space science.

00:00 - Space Nuts aims to answer questions from the audience about astronomy and space science
01:37 - Were the pyramids built by aliens or were they built by humans
04:26 - How is a photographic image produced from a radio telescope and not an optical telescope
12:36 - Dean: I often hear about gravity waves and I have a hard time visualising
20:15 - Andrew Dunkley: I think ideas become easier to explain over time
22:45 - Our next question comes from David from Port Washington, New York
30:37 - Several volcanoes have blown up since we've been to them
32:08 - The metropolitan area of Auckland contains 53 volcanoes
35:02 - If you could take a big inhale, what would space smell like
36:22 - If you would like to send us some questions, please do through our website

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Space Nuts: Moon impact, Roman Observatory launch, and Neptune’s odd moons
Andrew Dunkley is joined by Professor Jonti Horner, Professor of Astrophysics at the University of Southern Queensland, for a wide-ranging astronomy update. They cover SpaceX’s out-of-control rocket body hitting the Moon, the imminent launch of the Nancy Grace Roman Observatory, and a new result that may explain the strange origin of some of Neptune’s moons.
We discuss why lunar impacts matter far beyond the Moon itself, how Roman will study exoplanets and dark energy, and why clay minerals on Neptune’s small moons are such a big clue about a violent early solar system.
Key topics
SpaceX’s rocket body impacted the Moon after being left in a long, uncontrolled orbit
Why lunar impacts are a real concern for future habitats, infrastructure, and Apollo heritage sites
The sheer scale of human-made objects that have already hit or landed on the Moon
Elon Musk’s vision for lunar factories, rail-gun launches, and large-scale off-Earth manufacturing
Why the same company could end up both creating the risk and needing to solve it
The Nancy Grace Roman Observatory launching around 9 months ahead of schedule
Roman’s 2.4 metre mirror, 300 megapixel wide-field camera, and hydrazine-fueled journey to L2
How Roman will study dark energy, gravitational lensing, exoplanets, and free-floating planets
New James Webb observations of Neptune’s moons showing clay-type minerals on Larissa and Galatea
Why those clays suggest a much older, more violent system shaped by Triton’s capture and moon-to-moon collisions
Timestamps:
00:00 - Studio prep, muting phones, and getting ready to record
01:53 - Episode intro: SpaceX lunar impact, Roman Observatory, and Neptune moons
03:00 - Jonti Horner joins the show
04:26 - SpaceX rocket body crashes into the Moon
07:03 - Predicted impact plume and expected crater size
08:54 - Korean spacecraft Danuri captures post-impact images
10:19 - Why Moon impacts matter for future lunar bases
11:47 - Protecting Apollo landing sites and lunar archaeology
12:15 - More than 3,000 human-made objects have hit the Moon
14:32 - Law, responsibility, and the problem of cleanup beyond Earth
16:07 - Musk’s plans for Moon factories and Starlink-style expansion
18:12 - Rail guns, Optimus robots, and scaling lunar industry
19:34 - SpaceX’s own industry could be threatened by its own debris
21:24 - Balancing commercial benefits and environmental costs
23:46 - The Nancy Grace Roman Observatory launch approaches
26:03 - Roman’s orbit, hydrazine fuel, and five-year mission plan
27:57 - From WFIRST to Roman: how the telescope evolved
29:23 - Roman’s mirror, 300 megapixel camera, and survey power
30:14 - Exoplanets, microlensing, and the coronagraph
33:29 - Roman’s launch status and the excitement ahead
34:17 - Neptune’s moons and the role of Triton

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In this Q&A episode of Space Nuts, hosts Andrew Dunkley and Professor Jonti Horner tackle a variety of fascinating questions from listeners. From the intriguing phenomenon of planetary atmospheres that may rain diamonds and sapphires, to the complexities of satellite approvals and the possibility of planets forming without a star, this episode is packed with cosmic insights.
Key topics include:
- Nick from Perth asks about the science behind the claims of diamond and sapphire rain on distant planets, prompting a discussion on spectral analysis and the nature of scientific reporting.
- Sandy from Melbourne raises concerns about the recent FCC approval for Reflect Orbital's satellite, leading to an exploration of the regulatory landscape surrounding space launches and the implications for global cooperation.
- Rennie from California queries whether planets can form without a sun, which sparks a deep dive into the theories surrounding rogue planets and the role of dark matter in planetary formation.
Join Andrew and Jonty as they navigate these thought-provoking questions, shedding light on the mysteries of the universe and the ever-evolving field of astronomy.

00:00 - This is a Q and A episode and in this particular show we're answering audience questions
01:00 - Professor Jonty Horner joins us to discuss astrophysics
01:29 - The heat stays a bit longer than summer and the cold stays too much past winter
02:55 - Nick in Perth has a question regarding planetary atmospheres
11:29 - Scientists are extrapolating from what they know about planets' interior
12:49 - Andrew Dunkley: Question comes from Sandy in Melbourne, Australia
14:51 - FAA proposing to circumvent environmental laws for commercial launches and spacecraft reentries
21:54 - Fast developing industry with no regulation developed around it
25:20 - Space Nuts Q and A edition with Andrew Dunkley and Jonty Horner
25:38 - Can planets form without a sun because dark matter would be the gravity
33:41 - You can send in your Space Nuts questions via our website

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Sponsor Link:
This episode of Space Nuts is brought to you with the support of NordVPN. Secure your online presence and enjoy a special deal at www.nordvpn.com/spacenuts.  

Asteroid or comet, dinosaur impact firestorms, crater discovery, and Q&A on exoplanets and satellites
Andrew Dunkley is joined by Professor Jonti Horner of the University of Southern Queensland for two tightly related Space Nuts conversations. The first explores how astronomy keeps blurring the lines between asteroids and comets, what new research says about the dinosaur-killing impact, and a surprising crater found by an amateur astronomer planning a trip. The second is a listener Q&A covering exotic exoplanet weather, space regulation, and whether planets can form without a star.
Key topics
In this episode, Andrew and Jonti explain why astronomy often uses tidy labels for objects that sit on a continuum, especially when the line between asteroid and comet gets blurry.
They discuss near-Earth object 1998 SH2, which appears to have comet-like activity despite looking asteroid-like for decades.
Jonti breaks down how outgassing can nudge a small body off its predicted path, revealing non-gravitational forces.
The dinosaur-killing impact is revisited with new modelling suggesting the first hours after impact may have included global firestorms, not just long-term climate collapse.
The show covers the terminology debate around meteor, meteorite, fireball, bolide, asteroid, and comet impact.
A Canadian amateur astronomer, Joel LePointe, is credited with spotting a likely impact crater while planning a camping and hiking trip using satellite imagery.
The newly identified crater near Lake Marcel in northern Quebec is described as about 390 million years old and roughly 25 kilometers wide.

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