What is the furthest distance away we’ve ever observed? Why hasn't Venus lost its atmosphere from solar winds? Is Mercury a Ploonet? And how stable is the moon's orbit? It's another bonus episode with Izzie Clarke, Dr Becky Smethurst and Dr Robert Massey. See Micheal Brill's brilliant photos from Antarctica here. Read listener Andrew Street's article of Cassini's final moments:  Tracing Cassini's fiery death was like seeing a heart monitor flatline Send in your questions to The Supermassive Mailbox by emailing [email protected], tweet @RoyalAstroSoc or find us on Instagram @SupermassivePod.