These talks will be self-contained presentations of mathematical concepts and theorems. They are intended to be accessible to all mathematics students. Coffee, tea and drinks will be provided.

What are the facts behind the popular media interest in asteroids or comets that may collide with the Earth and destroy much of the life on Earth? Can such large bodies be deflected or destroyed in interplanetary space? We will review past impact events and how the scientific community came to the realization that stones can fall from the sky.