The UN's asteroid alarm: a Vienna official sounded Earth's near-miss alert
Aarti Holla-Maini, director of UNOOSA, triggered the UN’s first global planetary‑defence alert when asteroid 2024 YR4’s Earth‑impact probability rose from under 0.05% to over 1%, reaching Torino level 3; a rapid international response and consideration of deflection were drafted, testing real‑world space governance. UNOOSA’s Vienna team also coordinates satellite registrations and disaster response, and while the risk subsided by early 2025, the episode underscored the growing challenges of space traffic.