Professor Mark McCaughrean, Senior Advisor for Science & Exploration at the European Space Agency 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'.
