A month or so ago, we marked the fiftieth anniversary of the discovery of quasars – huge, energetic explosions of radio waves, powered by the accretion of material into supermassive black holes.

Our own Ron Ekers recently gave a presentation to mark this anniversary. In the following video he offers some fascinating anecdotes of the investigation into these mysterious objects, the history of radio astronomy, and CSIRO’s (then CSIR) involvement.