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Recorded27 Jul 2026

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Astronomy Daily · S05E151 · “The Faint Little World Has Its Day” · Monday 27 July 2026 · Hosts Anna & Avery. Pluto has its brightest night of the year — so we go deep on the world nobody can agree how to label. Then a crew comes home after 241 days, the galaxy’s most common planet turns out to maybe hide oceans of molten rock, and the first black hole ever photographed gets a sharper, two-colour read. In this episode LEAD — PLUTO AT OPPOSITION • Tonight Pluto sits opposite the Sun in Capricornus, near its closest point to Earth (~34.5 AU) and at its brightest for the year — yet still only magnitude ~15. • The full arc: Percival Lowell’s “Planet X,” Clyde Tombaugh’s 1930 discovery by blink comparator, and the name suggested by 11-year-old Venetia Burney. • The 2006 IAU reclassification to “dwarf planet” (the “clearing the neighbourhood” rule) — and the still-live debate between dynamical and geophysical definitions of a planet. • What New Horizons found in 2015: the nitrogen-ice plain of Sputnik Planitia, the famous “heart,” water-ice mountains, a hazy atmosphere, and a possible subsurface ocean. STORY 2 — HOME AFTER 241 DAYS • Soyuz MS-28 lands in Kazakhstan with NASA’s Chris Williams and cosmonauts Kud-Sverchkov and Mikaev; ~3,856 orbits, 102M+ miles; Expedition 74→75 handover to Jessica Meir. STORY 3 — SUB-NEPTUNES • New ASU modelling: deep clouds of vaporised rock and salt can act as a thermal blanket, potentially sustaining a hidden magma ocean and reshaping how we read JWST spectra. STORY 4 — M87 IN TWO COLOURS • A Shanghai Astronomical Observatory-led team builds the first spatially-resolved dual-frequency spectral map of M87* (1.3 mm + 3.5 mm, EHT + GMVA), linking the famous ring to the real physics of plasma at the event horizon. SKYWATCH — BOTH HEMISPHERES • South: Southern Delta Aquariids peaking (ZHR ~25) + Comet 10P/Tempel improving into August. North: Mu Cephei, Herschel’s Garnet Star, high in Cepheus. Both: Pluto at opposition, Saturn after midnight in Pisces. Caveat: a ~95% Moon washes out faint targets this week. Sources • NASA — “Astronaut Chris Williams, Crewmates Return from Space Station.” • ASU News / The Astrophysical Journal Letters — Mukherjee et al., clouds and the interiors of sub-Neptunes. • The Astrophysical Journal Letters — Zhao et al., “Spatially Resolved Spectral Properties of M87* on Event Horizon Scales” (DOI 10.3847/2041-8213/ae84ca). • Explore Scientific / Star Walk / astronomy.com — July 2026 observing notes (Pluto opposition, Southern Delta Aquariids, Comet 10P/Tempel, Mu Cephei).Become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-the-latest-space-news--5648921/support.Sponsor Details:Ensure your online privacy by using NordVPN. To get our special listener deal and save a lot of money, visit www.bitesz.com/nordvpn. You'll be glad you did!Get the best secure and private email on the planet. Stop your Government, google and who knows who else spying on every email you write. Do what we did and use ProtonMail. They beleive in privacy and there are no ads in their business model...yet they still provide a free forever service. Check them out and get out special deal at www.bitesz.com/protonmailBecome a supporter of Astronomy Daily by joining our Supporters Club. Commercial free episodes daily are only a click way... Click HereThis episode includes AI-generated content.

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