Astronomy Daily: Latest Space News

Today's episode — S05E190, Thursday September 10, 2026: Main story: 109 fast radio bursts have been used to measure how much galactic feedback has smoothed out the matter in the universe. A fast radio burst lasts about a millisecond, and on its way to us it is dispersed — low radio frequencies slowed more than high ones by free electrons along the path, exactly the way a prism separates white light. The size of that delay counts the ordinary matter the burst passed through. Writing in Nature Astronomy on 8 September, a team led by Kritti Sharma at Caltech, with Vikram Ravi, Liam Connor and Elisabeth Krause (University of Arizona), used 109 bursts localised to host galaxies out to redshift ~0.3 — most of them from Caltech's DSA-110 — to constrain the suppression of matter clustering by feedback, and the gas fractions of groups and clusters between 10^13 and 10^15 solar masses. They find more gas retained than the X-ray picture implies: gas fractions about 1.9σ above stacked eROSITA measurements, and slightly above the Atacama Cosmology Telescope's kSZ constraints, consistent with the bursts counting cool gas that X-rays miss. The constraint is already competitive with both of those far larger experiments, cutting the uncertainty on clustering at these scales by roughly a factor of eight. That matters because feedback is the confound sitting under the S8 tension — it mimics the signature of massive neutrinos and of some dark energy and dark matter models. The technique's foundation is Australian: the Macquart relation, established with ASKAP in Western Australia in 2020, is what found the universe's missing ordinary matter in the first place. The rest of the news: ·         Hypersoft X-ray sources: NASA and the Chandra X-ray Center announced a new class of object on 9 September — 84 sources across six galaxies (M31, M101 and four ellipticals) that emit more than eight times as many photons below 0.3 keV as just above it, exceeding 10^38 erg/s in that narrow band and more again in the extreme ultraviolet. Led by Mustafa Muhibullah (University of Alabama) with Jimmy Irwin and Rosanne Di Stefano (CfA), published in Nature Astronomy. They are likely compact objects accreting from companions, and may be both the long-sought progenitors of Type Ia supernovae and a significant unaccounted source of ionising radiation. ·         A rendezvous with Halley's Comet: a trajectory study circulated on 6 September by Roberto Flores and Elena Fantino (Khalifa University), Mauro Pontani (Sapienza), and Ivano Bertini and Cesare Barbieri (Padua) sets out the first Halley rendezvous achievable with proven hardware — unpowered Jupiter and Saturn gravity assists plus deep-space low-thrust arcs, a Hall-effect thruster on a standard RTG, ~2,000 kg launch mass with ~750 kg of instruments, launching August 2036 or September 2037 and arriving in 2060, about a year before Halley's 2061 perihelion. Months alongside the comet instead of Giotto's minutes at 68 km/s. ·         Apollo Maneuvers 2026: US Space Command announced on 8 September that it had completed the first live-fly orbital manoeuvre exercise of its kind, moving real operational satellites across low, medium and geosynchronous orbits with Operation Olympic Defender allies (Australia among them) and commercial operators via its Commercial Integration Cell. Named for the US Army's 1941 Louisiana Maneuvers. The practical consequence is more unpredictable objects in an already crowded region, and in-orbit refuelling becoming load-bearing. ·         Skywatch: New Moon on 11 September at 14:27 AEST (04:27 UTC) makes tonight and tomorrow the darkest nights of the month. Southern Hemisphere — the galactic core still high after dark, and Venus well placed low in the west-south-west, 7.4° from Spica and building to greatest brilliancy on 18 September at magnitude −4.8. Saturn rises about an hour after sunset for everyone, heading for its 4 October opposition with the rings about 7° from edge-on. North America — the pre-dawn sky, with Mars in Gemini passing Castor on the 12th and Pollux on the 17th, and Jupiter below it in Cancer. Plus a convoy of CMEs from AR4524 arriving since 8 September, two G1 storms already recorded and G2 possible: aurora chances at both ends of the planet, including Tasmania, coastal southern Victoria and New Zealand's South Island. Links & sources ·         Caltech — Fast Radio Bursts Poised to Help with Biggest Cosmic Mysteries (8 Sept 2026) — https://www.caltech.edu/about/news/fast-radio-bursts-poised-to-help-with-biggest-cosmic-mysteries ·         Sharma, Krause, Ravi, Connor et al., 'Signatures of Suppressed Matter Clustering revealed by Fast Radio Bursts', Nature Astronomy (8 Sept 2026) — https://arxiv.org/abs/2604.17162 ·         NASA — NASA's Chandra Unveils Mysterious X-ray Objects (9 Sept 2026) — https://science.nasa.gov/missions/chandra/nasas-chandra-unveils-mysterious-x-ray-objects/ ·         Muhibullah, Irwin & Di Stefano, 'Hypersoft X-ray Sources: A New Class of Luminous Cosmic Emitters', Nature Astronomy (9 Sept 2026) — https://arxiv.org/abs/2602.06192 ·         Flores, Beolchi, Pozzi, Pontani, Bertini, Barbieri & Fantino, 'Double Gravity-Assist Rendezvous Trajectory to Halley's Comet Using Deep-Space Low Thrust' (arXiv, 6 Sept 2026) — https://arxiv.org/abs/2609.02189 ·         Air & Space Forces Magazine — SPACECOM Maneuvers Satellites Across Orbits in New Exercise (9 Sept 2026) — https://www.airandspaceforces.com/space-command-maneuvers-satellites-across-multiple-orbits-in-new-exercise/ ·         EarthSky — Sun news: series of sun blasts arriving, auroras to come — https://earthsky.org/sun/sun-news-activity-solar-flare-cme-aurora-updates/ ·         EarthSky — Visible planets and night sky guide for September — https://earthsky.org/astronomy-essentials/visible-planets-tonight-mars-jupiter-venus-saturn-mercury/ ·         TheSkyLive — Moon calendar, September 2026 — https://theskylive.com/moon-calendar?year=2026&month=09

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Everything beyond Neptune is a leftover. The icy bodies of the Kuiper Belt never got assembled into a planet, and out there — dark, cold and empty enough that things mostly leave each other alone — they are the closest thing we have to the original building blocks of the solar system, still sitting roughly where they were made. The trouble is that everything we know about them, we learned from the big ones. Ground-based telescopes stop at around twenty-five kilometres. In two papers published on 8 September in The Astronomical Journal, teams using Hubble and Webb simultaneously — one telescope in visible light, one in the infrared, on the same field at the same moment — report twenty-seven previously unknown trans-Neptunian objects, the faintest ever directly detected. The smallest is about five kilometres across. NASA's own description of the faintest of them: the equivalent of standing on Earth and picking out a small swarm of fireflies on the Moon. The surprise is the colours. Objects that small are assumed to be collision fragments, and a fragment should be showing us the fresh ice under the irradiated red rind — so the small population should look bluer and messier than the large one. It doesn't. Led by Anastasia Morgan at Northern Arizona University, the colour study finds the small objects carry the same colour relationship as their large counterparts, in both the dynamically cold population that formed in place and the dynamically hot population that was flung outward during the giant planets' migration. David Trilling: these hot objects 'retain a signature of where they were born, even though they've been orbitally scrambled since then.' The companion size-distribution study, led by Marielle Eduardo at the University of Victoria, finds the same size distribution in both populations despite their different birthplaces. Together the two results point away from small TNOs being rubble and towards planetesimals that formed quickly, at large sizes — the picture Arrokoth gave us up close in 2019. Then: Anak Krakatau. The Sunda Strait volcano went into a major explosive phase on 5 September that ran more than twenty-four hours, throwing ash to 15,000 metres — 50,000 feet — to the west. Eight airports closed across Java and Sumatra, 2,961 flights grounded, around 170,000 travellers stranded. NASA's Earth Observatory published Landsat 8 and Suomi NPP imagery on 9 September. The whole warning chain runs through orbit: geostationary Himawari-9 imaging the full disc every ten minutes, feeding the Darwin Volcanic Ash Advisory Centre run by Australia's Bureau of Meteorology — because ash doesn't show up on aircraft weather radar, and the only warning a crew gets comes up from the ground. ESA closed out the 26-year Cluster mission by flying its last two satellites, Samba and Tango, into the atmosphere over the South Pacific near Tonga on 31 August and 1 September — deliberately, and precisely enough that a chartered business jet carrying thirty instruments could be underneath them. The ROSIE campaign, led by Jiří Šilha of Astros Solutions, got about fifty seconds on each spacecraft, measuring not the light show but the chemistry: titanium, sodium, potassium and aluminium, and specifically aluminium oxide, whose effect on ozone at those altitudes is a genuinely open question as constellations scale. ESA's Draco mission in 2027 will record the same process from the inside. And a study from the Instituto de Astrofísica de Canarias, published in Astronomy & Astrophysics and released on 4 September, finds that Messier 74 — the Phantom Galaxy — is more than twice the size the catalogues give it. Deep imaging with a one-metre telescope, about ten times deeper than Sloan, traces a disc of young stars out to roughly 100,000 light years against a catalogued 45,000. Mean age in that outer region: 640 million years. The likely cause is a close pass by the neighbouring galaxy UGC 1176 about a billion years ago. Skywatch covers both hemispheres on a New Moon week — the galactic core overhead from Sydney in its last strong month, the Teapot low in the south for North America, Venus building to greatest brilliancy on the 18th, Saturn climbing towards its 4 October opposition, and the full ISO 12312-2 safety passage for anyone tempted to hunt Venus in daylight. Links & sources NASA — NASA's Hubble, Webb Find Far-out Solar System Objects 'Remember' Past — https://science.nasa.gov/missions/hubble/nasas-hubble-webb-find-far-out-solar-system-objects-remember-past/ Morgan et al. — colours of small trans-Neptunian objects, The Astronomical Journal (8 Sept 2026) — https://doi.org/10.3847/1538-3881/ae907f Eduardo et al. — size distribution of small trans-Neptunian objects, The Astronomical Journal (8 Sept 2026) — https://doi.org/10.3847/1538-3881/ae9084 NASA Earth Observatory — Anak Krakatau Rumbles Again (Image of the Day, 9 Sept 2026) — https://science.nasa.gov/earth/earth-observatory/anak-krakatau-rumbles-again/ ANTARA News — Volcanic ash grounds 2,961 flights in Indonesia — https://bali.antaranews.com/berita/413072/volcanic-ash-grounds-2961-flights-in-indonesia ESA — Cluster's encore for reentry science a success (2 Sept 2026) — https://www.esa.int/Space_Safety/Space_Debris/Cluster_s_encore_for_reentry_science_a_success ESA — Moving satellites to meet a plane for rare reentry data — https://www.esa.int/Space_Safety/Space_Debris/Moving_satellites_to_meet_a_plane_for_rare_reentry_data Space.com — 2 satellites just burned up in Earth's atmosphere, and scientists were watching from a private jet — https://www.space.com/space-exploration/satellites/2-satellites-just-burned-up-in-earths-atmosphere-and-scientists-were-watching-from-a-private-jet-heres-why Instituto de Astrofísica de Canarias — An IAC study reveals that galaxies can grow in an 'explosive' way (4 Sept 2026) — https://www.iac.es/en/outreach/news/iac-study-reveals-galaxies-can-grow-explosive-way Astronomy & Astrophysics — 2026 press releases — https://www.aanda.org/2026-press-releases NASA — What's Up: September 2026 skywatching tips — https://science.nasa.gov/solar-system/skywatching/whats-up-september-2026-skywatching-tips-from-nasa/ TheSkyLive — Moon phase calendar, September 2026 — https://theskylive.com/moon-calendar?year=2026&month=09

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For fifty years the story has been that the Moon assembled slowly out of a disc of debris. New simulations from Southwest Research Institute add one thing everybody left out — the strength of rock — and get an intact Moon in about five hours. Plus eight black holes that outgrew their galaxies, two massive stars that fell past each other and got caught, Dragonfly's Titan landing site gets a name, and today's daylight occultation of Jupiter.

Links & sources Southwest Research Institute — SwRI-led modeling identifies new scenarios for Moon formation — https://www.swri.org/newsroom/press-releases/swri-led-modeling-identifies-new-scenarios-moon-formation Denton, Canup, Asphaug et al. — The Astrophysical Journal Letters (DOI) — https://doi.org/10.3847/2041-8213/ae91e9 Space.com — Earth's moon could have formed in just 5 hours after giant impact — https://www.space.com/astronomy/moon/earths-moon-could-have-formed-in-just-5-hours-after-giant-impact Buchner et al. — A large population of overmassive black hole quasars at z=0.3–0.8 revealed by eROSITA, A&A 713, A11 — https://www.aanda.org/articles/aa/full_html/2026/09/aa59356-26/aa59356-26.html Astronomy & Astrophysics — 2026 press releases — https://www.aanda.org/2026-press-releases Zhang, Garay et al. — An eccentric massive protobinary assembled via a core-merger parabolic encounter, Nature Astronomy — https://www.nature.com/natastron/articles?year=2026 Universidad de Chile coverage of the IRAS 07299-1651 result — https://www.radiofestival.cl/la-danza-nupcial-de-estrellas-masivas-astronomo-de-la-universidad-de-chile-participa-de-historico-hallazgo/ NASA / APL — Dragonfly Gets Wired Up While Titan Landing Area Is Named — https://science.nasa.gov/blogs/dragonfly/2026/09/02/nasas-dragonfly-gets-wired-up-while-titan-landing-area-is-named/ Sky & Telescope — Tuesday's daytime Jupiter occultation, a warm-up for the 'big one' — https://skyandtelescope.org/astronomy-news/tuesdays-daytime-jupiter-occultation-a-warm-up-for-the-big-one/ Universe Today — September's lunar occultations: circumstances and visibility — https://www.universetoday.com/articles/penultimate-lunar-occultations-inbound-for-jupiter-venus-and-more-in-september NASA — What's Up: September 2026 skywatching tips — https://science.nasa.gov/solar-system/skywatching/whats-up-september-2026-skywatching-tips-from-nasa/ EarthSky — Visible planets and night sky guide for September — https://earthsky.org/astronomy-essentials/visible-planets-tonight-mars-jupiter-venus-saturn-mercury/

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A German rocket lifted off from an Arctic island on Saturday and became the first vehicle ever to reach orbit from Western European soil. Plus: the gaps in stellar streams may not be dark matter after all, two white dwarfs circling every 374 seconds in the far southern sky, peptides that fold in concentrated sulfuric acid, and what Katalyst's LINK is actually doing next to Swift. Both-hemispheres skywatch, and a serious safety warning for tomorrow's daylight Jupiter occultation.

Links & sources ·         Isar Aerospace — mission updates — https://isaraerospace.com/mission-updates-overview ·         ESA — Spectrum launches to orbit (imagery) — https://www.esa.int/ESA_Multimedia/Images/2026/09/Spectrum_launches_to_orbit ·         NASASpaceflight — Isar 'Onward and Upward' — https://www.nasaspaceflight.com/2026/09/isar-onward-and-upward/ ·         Space.com — Private German rocket makes history — https://www.space.com/space-exploration/launches-spacecraft/isar-aerospace-second-launch-norway-andoya-spaceport-spectrum-rocket ·         Space.com — Gilmour Space eyes a second orbital attempt — https://www.space.com/space-exploration/launches-spacecraft/australias-gilmour-space-not-going-to-give-up-as-it-eyes-2nd-orbital-launch-attempt-in-2026 ·         Sky & Telescope — Gaps in stellar streams may be common — https://skyandtelescope.org/astronomy-news/gaps-in-stellar-streams-common-not-sign-dark-matter/ ·         Arora et al. — Semianalytic modeling of subhalo encounters with thin stellar streams, ApJ — https://iopscience.iop.org/article/10.3847/1538-4357/adf740 ·         Sharma et al. — Rapid orbital decay in eRASSU J060839.5−704014 (arXiv) — https://arxiv.org/abs/2608.09341 ·         Maitra et al. — eRASSU J060839.5−704014 discovery paper, A&A (2024) — https://www.aanda.org/articles/aa/ref/2024/03/aa47811-23/aa47811-23.html ·         MIT News — Peptides can form well-defined structures in Venus-like conditions — https://news.mit.edu/2026/study-peptides-can-form-well-defined-structures-harsh-venus-conditions-0831 ·         NASA Swift blog — Commercial spacecraft for Swift boost continues tech demo — https://science.nasa.gov/blogs/swift/2026/09/04/commercial-spacecraft-for-nasas-swift-boost-continues-tech-demo/ ·         NASA Swift blog — LINK spacecraft recovery progressing — https://science.nasa.gov/blogs/swift/2026/08/06/link-spacecraft-recovery-progressing-for-nasas-swift-boost/ ·         EarthSky — Saturn at opposition, 4 October 2026 — https://earthsky.org/astronomy-essentials/saturn-at-opposition-closest-brightest-best/ ·         Star Walk — Astronomical events, September 2026 — https://starwalk.space/en/news/night-sky-tonight-september

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Anna and Avery open the Weekend Wrap with a genuine first: South Africa's MeerKAT has detected the 21-centimetre hydrogen signal from four to five billion light years away using radio data alone — no optical galaxy survey propping it up — proving out the technique the Square Kilometre Array will use to measure dark energy. Then the week in review: Roman's coronagraph wakes up, Starship Flight 14 gets a date, Mars turns out to be lopsided inside, BepiColombo lets go, LZ's one unexplained flash, and a centaur caught in the act of becoming a comet. Plus the sky for the week ahead, both hemispheres.

Links & sources ·         University of Manchester — Astronomers use MeerKAT to directly detect faint hydrogen signal from the distant Universe — https://www.manchester.ac.uk/about/news/astronomers-use-meerkat-to-directly-detect-faint-hydrogen-signal-from-the-distant-universe ·         The Astrophysical Journal Letters — Paul, Wolz, Santos, Chen et al. (paper DOI) — https://doi.org/10.3847/2041-8213/ae808f ·         American Astronomical Society — release listing — https://aas.org/node/730547 ·         Phys.org — MeerKAT directly detects faint hydrogen signal from the distant universe — https://phys.org/news/2026-09-meerkat-faint-hydrogen-distant-universe.html ·         Space.com — Scientists detect signals of hydrogen from billions of years ago — https://www.space.com/astronomy/galaxies/scientists-detect-signals-of-hydrogen-from-billions-of-years-ago-could-this-help-us-map-out-the-universe ·         Xinhua — MeerKAT in South Africa directly detects faint hydrogen signal from distant universe — https://english.news.cn/africa/20260905/3f6c7164a4404b0a9b79f879b1d31a59/c.html ·         SKA Observatory — the construction journey (SKA-Mid, Karoo; SKA-Low, Murchison) — https://www.skao.int/en/explore/construction-journey ·         NASA Science — Roman's planet imager has powered on (1 September 2026) — https://science.nasa.gov/blogs/roman/2026/09/01/nasa-romans-planet-imager-has-powered-on/ ·         NASA — NASA's dark universe-seeking Nancy Grace Roman Space Telescope launches — https://www.nasa.gov/news-release/nasas-dark-universe-seeking-nancy-grace-roman-space-telescope-launches/ ·         Next Spaceflight — Starship Flight 14 (NET 15 September 2026, Pad 2, Starbase) — https://nextspaceflight.com/launches/details/8346/ ·         Tesla Oracle — FCC filing points to Starship Flight 14 on 15 September; Booster 21 33-engine static fire — https://www.teslaoracle.com/2026/09/02/fcc-filing-reveals-starship-flight-14-launch-on-september-15-spacex-conducts-33-engine-static-fire-on-booster-21/ ·         Nature — Tidal tomography reveals a thermal anomaly beneath Mars's crustal dichotomy (27 August 2026) — https://www.nature.com/articles/s41586-026-10893-x ·         Phys.org — Thermal anomaly discovered below Mars' south pole — https://phys.org/news/2026-08-thermal-anomaly-mars-south-pole.html ·         ESA — Latest updates: BepiColombo's arrival at Mercury — https://www.esa.int/Science_Exploration/Space_Science/BepiColombo/Latest_updates_BepiColombo_s_arrival_at_Mercury ·         ESA — BepiColombo's Mercury arrival begins (full replay) — https://www.esa.int/ESA_Multimedia/Videos/2026/09/BepiColombo_s_Mercury_arrival_begins_-_full_replay ·         Brown University — LZ experiment sees surprising result in search for dark matter — https://www.brown.edu/news/2026-09-01/lz-dark-matter-results ·         The LZ Dark Matter Experiment — collaboration site — https://lz.lbl.gov/ ·         ARC Centre of Excellence for Dark Matter Particle Physics — Stawell Underground Physics Laboratory — https://www.centredarkmatter.org/supl ·         University of Central Florida — UCF researchers study a centaur transforming into a comet — https://www.ucf.edu/news/ucf-researchers-study-a-centaur-transforming-into-a-comet/ ·         Phys.org — Saturn encounter may have set distant centaur on path to becoming a comet — https://phys.org/news/2026-09-saturn-encounter-distant-centaur-path.html ·         Space.com — Scientists watch a comet being born 3 billion miles away — https://www.space.com/astronomy/comets/scientists-watch-a-comet-being-born-3-billion-miles-away ·         Star Walk — Astronomical events in September 2026 — https://starwalk.space/en/news/night-sky-tonight-september ·         EarthSky — Venus greatest brilliancy, 18 September 2026 (magnitude −4.8) — https://earthsky.org/astronomy-essentials/venus-brightest-greatest-brilliancy-greatest-illuminated-extent-2/ ·         EarthSky — Sun news: flares, CMEs and aurora updates — https://earthsky.org/sun/sun-news-activity-solar-flare-cme-aurora-updates/ ·         Space.com — Night sky September 2026: the best things to see this month — https://www.space.com/stargazing/what-to-see-night-sky-september-2026 Follow us: @AstroDailyPod · astronomydaily.io

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