Astronomy Daily S05E152 — “Reading the Heat” · Tuesday 28 July 2026. Hosts Anna & Avery. NASA’s Juno spacecraft has taken the first-ever temperature reading beneath the surface of Io, Jupiter’s volcanic moon — and the technique behind it could reshape how we study icy ocean moons and even volcanoes on Earth. We also look at why JWST’s “Little Red Dots” might be globular clusters being born, the first SETI search built from archived ALMA data (and its six-million-star surprise), and a live burst of space weather feeding into a meteor-filled — if Moon-washed — skywatch.
In this episode ● Juno reads Io’s subsurface temperature for the first time — >20°C rise within a few metres, heat flow up to ~30× Earth’s average, and a remarkably smooth, low-density surface. ● Why the method matters: a multi-depth microwave thermometer that works from orbit — promising for Europa, Enceladus, and terrestrial volcanology. ● JWST’s “Little Red Dots” may be globular clusters in formation, powered by a short-lived supermassive star — linking two long-standing mysteries. ● The first SETI survey of archived ALMA data opens the millimetre band — and reveals “stellar bycatch” of 6.1 million background stars. ● Live space weather: an M3.2 flare from region AR4494 and a glancing CME, with G1–G2 storms and possible aurorae, north and south. ● Skywatch: meteor week under the full Buck Moon (29 July), the Alpha Capricornid fireball tip, evening Venus, pre-dawn Saturn/Mars/Mercury — and Jupiter vanishing behind the Sun.
Sources ● NASA/JPL — “NASA’s Juno Takes Temperature of Jupiter’s Fiery Moon Io” (22 July 2026); Brown et al., J. Geophys. Res.: Planets, DOI 10.1029/2025JE009622. ● Chisholm et al., “Little Red Dots as Globular Clusters in Formation,” Astrophysical Journal Letters (press cycle 20 July 2026; UT Austin / McDonald Observatory). ● L. Mason (University of Manchester), first ALMA-archive SETI survey, RAS National Astronomy Meeting 2026. ● Space-weather status: EarthSky Sun news / NOAA SWPC (M3.2 flare AR4494, 26 July; 24 July CME; G1–G2 outlook, 27–28 July). ● Skywatch data: EarthSky, Star Walk, American Meteor Society, NASA — Southern Delta Aquariids (peak ~30 July), Alpha Capricornids (30–31 July), full Buck Moon 29 July, Jupiter solar conjunction 29 July.
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