Dr Katie Mack: life, the universe and everything

Astrophysicist Katie Mack discusses the possibility of time travel, how time will end, gravitational waves and the power of antimatter. Dr Mack is the Hawking Chair in Cosmology and Science Communication at the Perimeter Institute for Theoretical Physics in Canada - where she carries out research on dark matter and the early universe. Dr Mack wants to make physics more accessible. She is the author of the 2021 book The End of Everything.