About this episode
Ciaran and Dan look at what makes a planet and whether there's a mysterious extra planet – Planet X – just beyond Neptune, lurking in our cosmic neighbourhood. Mysteries of Science is a fortnightly podcast created by The Week Junior's Science+Nature magazine and Fun Kids. Tap follow or subscribe wherever you're listening to this to make sure you never miss an episode, and get ready for a summer of fascinating mysteries, including Planet X and massive treasure hunts. Get three copies of The Week Junior's Science+Nature magazine for just £5. sciencenature.theweekjunior.co.uk/podcast is the place to claim yours. See omnystudio.com/listener for privacy information.