In this episode, Hannah, Hugh, and Andrew ask the question: Do all planets orbit stars? 

Even though the vast majority of planets found so far are bound to a star, there have been detections of planetary-mass objects floating alone through space. Are these planets? How do these objects form, and how can we detect them? Is it possible that these free-floating objects could be considered ‘habitable’? The exocast gang tackle these tricky topics and other nomenclature-related debate surrounding this seemingly simple but deceptively complex question.

Do you have a question we didn’t ask? Join in the discussion in the comments below, and find us on Twitter. You can also get your hands on Exocast merchandise at exocast.threadless.com

Exocast is edited by musician/composer Fergus Hall (https://www.fergushallmusic.com) and is supported by listener donations at buymeacoffee.com/exocast. Each coffee costs $4 and donations over $15 get a shout-out on the show. We cannot make the show without your support and it is very much appreciated.