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Impact on Earth?
How big a threat to Earth are asteroids and comets?
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 主播大秀 World Service Archive and was originally broadcast in 1999.
