Episode
The Evolving Enigma of Dark Energy and the Sun's Mysterious Past
- Published
- Sep 14, 2026
- Duration seconds
- 1794
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- https://www.astronomydaily.io
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Summary
An Australian-led team has rebuilt thirty years of supernova observations into one consistent catalogue — and it adds fresh weight to the idea that dark energy is not constant. We also ask whether the young Sun swallowed a super-Earth, find out why a quiet Sun is bad news at thirty-five thousand feet, and watch JWST run the most sensitive exomoon search ever attempted. Plus a Crew-13 update and a skywatch with a live aurora alert for both hemispheres. In this episode · Two thousand, eight hundred and eighty-four Type Ia supernovae, rebuilt from Pantheon+ and the Dark Energy Survey's full five-year sample into a single internally consistent catalogue by Ryan Camilleri and Professor Tamara Davis at the University of Queensland, with ANU, Swinburne and international colleagues. · On their own the supernovae give a matter density of 0.310 for flat ΛCDM. Combined with the CMB and baryon acoustic oscillations, a tension appears under constant dark energy — and eases when dark energy is allowed to evolve. Preference: 2.5–3.1 sigma. · Why that is interesting but not a discovery, and why a second independent line of evidence pointing the same way as DESI changes the shape of the argument. · Professor Mutlu Yildiz (Ege University) on whether the young Sun engulfed a planet of 5–10 Earth masses — and whether that single event explains both the solar sound-speed discrepancy and the Sun's missing lithium. · Yaniv, Yair and Price on six balloon flights to 35 km: cosmic radiation at cruising altitude runs 40–60% higher at solar minimum, with an anticorrelation of r = −0.71 against solar activity. · David Kipping stacks twelve JWST transits of LP 890-9c and excludes moons down to 0.1 Earth radii across the entire Hill region — the most sensitive exomoon search on record. · Crew-13 now…