The physicist Cai Ronggen visits Pui Kiu College to discuss "The Past and Present of Black Holes."

Discussion between Cai Ronggen and representatives teachers and students from Pui Kiu College

On February 19, 2025, Cai Ronggen, academician of the Chinese Academy of Sciences, member of the National Committee of the Chinese People's Political Consultative Conference, researcher at the Institute of Theoretical Physics of the Chinese Academy of Sciences, renowned theoretical physicist, and the president of Ningbo University, visited Pui Kiu College. He delivered an engaging and accessible lecture on the topic "The Past and Present of Black Holes," attended by over three hundred teachers and students, creating a lively atmosphere.

As an authoritative expert in the field of gravitational theory and cosmology, Cai Ronggen has long been dedicated to cutting-edge research on black hole physics, quantum gravity, and cosmology. His team has achieved several groundbreaking results in areas such as black hole thermodynamics and gravitational wave theory. During the lecture, Cai Ronggen began with the historical origins of the black hole concept, vividly explaining the mechanisms of black hole formation and evolution in conjunction with Einstein's general relativity. He also introduced the first image of a black hole captured by humans and the first direct detection of a gravitational wave event.

During the interactive session, students actively seized the opportunity to ask questions, ranging from "Can black holes change the irreversibility of time?" to "Can one reach a parallel universe by passing through a black hole?" They also inquired about Cai Ronggen's insights into the field of physics. Cai patiently answered each question in relation to general relativity. He emphasized that physics, as a fundamental science, is the foundation of national technological innovation, and encouraged the students of Pui Kiu College to maintain their curiosity and courage in tackling scientific challenges.