A radio and x-ray composite image of quasar PKS0637-752.
Quasar PKS 0637-752, a bright distant galaxy in the southern sky. Credit: radio image (ATCA) by J. Lovell; X-ray image by Chandra.

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.