Fall 2023 Physics Colloquium:- Comets, unseen planets, and the outer fringes of the solar system
Comets have inspired awe since prehistoric times, but even today there are only a few thousand comets with well-determined orbits. Nevertheless, the analysis of this limited sample yields a compelling model for the formation, evolution and present distribution of comets. This model implies that the primary source of comets is the Oort cloud, containing over 100 billion comets at 5,000 to 100,000 times the Earth-Sun distance. The speaker will review our current understanding of the history and structure of the Oort cloud, and what comets can tell us about possible undiscovered planets beyond Neptune.
地點：香港大學 百周年校園 賽馬會教學樓中心平台 地下一樓10室*
講者：Prof. Scott D. TREMAINE (Institute for Advanced Study, Princeton, US)
*CPD-LG.10, Centennial Campus, The University of Hong Kong