Peter Galison Director of Black Holes: The Edge of All We Know and Co-founder of the Black Hole Initiative at Harvard University, joined Sean on the show. 

Listen and subscribe to Moncrieff on Apple Podcasts, Google Podcasts or Spotify.

Download, listen and subscribe on the Newstalk App.

You can also listen to Newstalk live on newstalk.com or on Alexa, by adding the Newstalk skill and asking: 'Alexa, play Newstalk'.