Astronomy Daily S05E154 — “The Reach of a Giant.” Thursday, 30 July 2026. Hosted by Anna and Avery. In this episode • A supermassive black hole caught heating and stirring an entire galaxy cluster — turbulence reaching ~300,000 light-years, about 100× more energetic than expected (XRISM / quasar H1821+643). • Why some “clean” white dwarfs are secretly feasting: magnetic fields funnel shredded planetary debris to the poles, aurora-style, hiding the meal. • NASA’s Psyche used its Mars flyby as a dress rehearsal — spotting Phobos and Deimos from afar to practise for its 2029 moonlet hunt at asteroid 16 Psyche. • A new study on keeping the road to the Moon clear: modelling how debris disperses in Distant Retrograde Orbits as cislunar traffic climbs. • Skywatch: tonight’s double meteor shower — the Southern Delta Aquariids and Alpha Capricornids — with both-hemispheres viewing details and local times. Sources • Yamada, S. et al., “Vigorous turbulence driven by quasar-mode feedback in a cluster core,” Nature Astronomy, 28 July 2026 (DOI 10.1038/s41550-026-02939-x; arXiv 2607.24911). Tohoku University release. • “White Dwarfs Eat More Planetary Debris Than Thought, But Magnetic Fields Hide It,” Universe Today, 29 July 2026 (Pham et al., arXiv 2607.20747). • “NASA’s Psyche Spacecraft Aces Mars Flyby,” NASA JPL / ScienceDaily, 28 July 2026. • “The Risks of Debris Between the Earth and the Moon for Future Exploration,” Universe Today, 29 July 2026 (Chinese Academy of Sciences DRO study). • Double meteor shower peak: American Meteor Society; NASA; Scientific American; CNN; National Geographic, 28–30 July 2026. Correction / caveat desk • Skywatch numbers assume the ~98% waning Buck Moon (full 29 Jul). Faint Delta Aquariids will be washed out; the Alpha Capricornid fireballs are the reliable catch tonight.
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