If you have been paying attention to the news for the past few weeks, you might have heard about a "city-destroying" asteroid – 2024 YR4 – spotted late last year that had the potential to impact Earth in 2032. While the chances of 2024 YR4 hitting us were once thought to be as high as 3 per cent, they have, fortunately, since been revised down to near zero – but with new asteroids and other objects being spotted all the time, our luck at avoiding the big ones may not hold forever.

Fortunately, the International Asteroid Warning Network (IAWN), comprising astronomers and organisations around the world, is on the case, cataloguing and tracking potentially hazardous asteroids and near-Earth objects to keep the risk of being caught by surprise to a minimum.

Professor Ed Kruzins of UNSW Canberra is one member of the IAWN and he joins the Space Connect Podcast to discuss how asteroids are tracked, what might happen on an impact – and what we could do to prevent one.