How far away is the edge of the Solar System? What even is 'the edge'? How do we know it's there? In this month's episode we take a look at the outer limits of our planetary neighbourhood. Plus: we talk to Keith Hayward of the Royal Aeronautical Society about the Chinese space programme and reveal how to make the most of August's Perseid meteor shower.   See acast.com/privacy for privacy and opt-out information.