What counts as a moon? Huge ‘exosatellite’ sparks debate

00:45 The discovery of a moon-like object in a distant star system Research article: Hoy et al. 10:34 Research Highlights Nature: Moving floors keep buildings from swaying with the wind Nature: Wearable sensors on the face are invisible to the eye 13:07 A discovery of a new type of rare transmissible-cancer Research article: Curd et al. Subscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday. Hosted on Acast. See acast.com/privacy for more information.