Asteroid Flybys, Cosmic Mysteries, and the Search for the Universe’s Ghost Signals

Today on Astronomy Daily: Japan's Hayabusa2 pulls off a nail-biting high-speed asteroid flyby, James Webb finds the same unexplained chemical mystery on Titan AND Pluto, a neutrino detector may have caught the universe's oldest supernova echo, a wild new theory tries to solve the black hole information paradox, we wrap up the weekend's aurora action, and we look at when NASA's New Horizons might finally cross into interstellar space.

Monday, July 6, 2026 1. Hayabusa2's Flyby of Asteroid Torifune • JAXA's Hayabusa2 spacecraft flew within ~800 metres of near-Earth asteroid (98943) Torifune on July 5, 2026, at a relative speed of about 5.25 km/s (~18,000 km/h). • This is an extended-mission flyby, not a sample return — Hayabusa2 already delivered Ryugu samples to Earth in December 2020. • Purpose: engineering demonstration of high-precision navigation relevant to planetary defense (asteroid deflection technology). • Torifune is roughly 450 metres across. Next stop for Hayabusa2: rendezvous with asteroid 1998 KY26 in 2031. • Source: JAXA/ISAS, Nikkei Asia, phys.org (July 5, 2026). 2. Mystery Molecule Found on Both Titan and Pluto • James Webb Space Telescope data reveals an unexplained absorption feature at ~5.11 micrometres on the surfaces of Titan (Saturn's largest moon) and Pluto. • Evidence points to a surface origin rather than atmospheric origin, based on limb-vs-disc-center comparison on Titan. • Candidate compounds include allenes, but no confirmed identification yet. • Pluto's absorption line is roughly three times broader than Titan's at the same central wavelength. • Study led by Dr. Bruno Bézard's team (Paris Observatory); posted to arXiv June 11, 2026 — not yet peer-reviewed. 3. Super-Kamiokande's Hint of the Diffuse Supernova Neutrino Background • Super-Kamiokande collaboration presented results at Neutrino 2026 (UC Irvine) after analyzing ~5,000 days of data. • Found a statistically significant excess of events between 13.3–81.3 MeV — consistent with the long-predicted Diffuse Supernova Neutrino Background (DSNB). • Significance: 2.6-sigma (~99.5% confidence) — below the 5-sigma discovery threshold, so described as an 'indication,' not a confirmed detection. • If confirmed, DSNB would offer a new way to study the cosmic history of core-collapse supernovae via neutrinos rather than light. 4. A Theoretical Fix for the Black Hole Information Paradox • New theoretical study proposes black holes stop evaporating just before vanishing completely, leaving a stable Planck-scale remnant (~9×10⁻⁴¹ kg). • Mechanism: a repulsive force from spacetime torsion in a 7-dimensional Einstein-Cartan model, active at extreme (Planckian) densities. • Proposal: quantum information is preserved via long-lived 'vibrations' in the remnant's internal torsion field. • This is a theoretical/mathematical proposal, not an observational result. Researchers: Pinčák, Pigazzini, Pudlák, Bartoš. 5. Weekend Geomagnetic Storm / Aurora Wrap-Up • X1.1 solar flare (June 30) and associated CME triggered a G3 (strong) geomagnetic storm around July 3–4, 2026. • Aurora borealis visible as far south as Utah, Colorado, and Nevada in the continental US. • NOAA SWPC reports conditions easing to unsettled/G1 levels through July 6 as CME effects wane. 6. Forecasting New Horizons' Crossing Into Interstellar Space • SwRI researchers (lead: Dr. Jonathan Gasser) combined solar wind forecasting with heliosphere models to predict New Horizons' termination shock crossing. • Forecast window: 2029–2040, with possible multiple crossings as the heliosphere expands/contracts with the solar cycle. • New Horizons is currently ~66 AU from the Sun. Voyager 2 crossed its termination shock at 84 AU in 2007, with a 46% solar wind speed drop. • New Horizons would become only the third spacecraft (after Voyager 1 and 2) to cross this boundary. • Two papers: Advances in Space Research and The Astrophysical Journal (SwRI, 2026).

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