Impact on Earth?

Available for over a year

How big a threat to Earth are asteroids and comets? Discussion with Duncan Steel of Spaceguard Australia. The discovery of a bright new star called Nova Velorum 1999 - explanation with Paul Murdin of the Particle Physics and Astronomy Research Council. Plus what was happening among the stars and planets in July 1999. This is a programme from the BBC World Service Archive and was originally broadcast in 1999.