Movies like 'Deep Impact' and 'Armageddon' are Hollywood action adventure movies which sees the world threatened by complete destruction due to the impact of a giant asteroid, where a hero - like Bruce Willis in Armageddon - is sent to save the world from an approaching asteroid. Monday June 30th is World Asteroid Day - so what is the chance that we might all be wiped out by an asteroid... and do we need a Bruce Willis character to save us? In this edition of Weekend One on One we hear from Professor Christopher Palma from the Department of Astronomy & Astrophysics at Penn State University in the United States.