3I/ATLAS Dated 10–12 Billion Years Old: The Oldest Object Ever Observed Passing Through the Solar System
A measured account of the day's principal case under Council review, with citation, location, and verdict status.
New research summarised across The Guardian, The Conversation, Big Think and ScienceAlert on 22 June 2026 dates interstellar object 3I/ATLAS to between 10 and 12 billion years old — predating our 4.6-billion-year-old Solar System by more than 5 billion years and making it the oldest object ever directly observed passing through it. The age estimate is derived from kinematic evidence that 3I/ATLAS originates in the Milky Way's thick disk, an older stellar population than the thin disk where the Sun resides. The Council records the age finding as Confirmed science and the case-level verdict as Inconclusive: the antiquity of the object is established, while the simultaneous Avi Loeb Medium essay reframing the Webb methane detection as a possible biosignature pushes the technosignature question back into open territory the week the new UAP Science Advisory Council was named to evaluate it.