# #172 Where does space end? w/Jim Al-Khalili. How do ships float? What is the biggest airport in the world?

An episode of [Everything Under The Sun](https://invisiblenetwork.ai/podcast/1442273607), 19 Dec 2025, 10 min.

Audio: https://pscrb.fm/rss/p/traffic.omny.fm/d/clips/289ceca7-bef3-48af-9f74-a4ba0095cab1/a79c2500-6af4-430d-b648-b0a700e3c901/c80eca5b-e650-4d8d-93d4-b3b800e1ce26/audio.mp3?utm_source=Podcast&in_playlist=5c9d2315-4c93-4006-895e-b0a700e3c935

Welcome to Episode #172 of Everything Under the Sun! Today we welcome back the thrillingly theoretical Jim Al-Khalili to uncover the mystery of space's edge! 🪐🔭🚀 We discover how ships float with the help of Pippa Kenton-Page's amazing contribution to Everything Under the Sun: All Around the World! 🛶⛵️🚤 And to finish it off we find out about the airports of the world, discovering the biggest one, smallest one, and the weird ones! ✈️🛬💺 Don't forget, if three questions just aren't enough for you, there are 366 more in Everything Under the Sun: All Around the World! Check it out at www.mollyoldfield.co.uk! It makes the perfect pressie do buy one now : ) If you want more Everything Under The Sun, here is the Everything Under The Sun: Quiz Book. Available on Amazon here, or through independent UK bookshops here. On top of that the original book Everything Under the Sun: a curious question for every day of the year is available on Amazon and in independent bookshops here. Instagram: @itseverythingunderthesun and @mollyoldfieldwrites Tiktok: @itseverythingunderthesun X/Twitter: @eutsworld See omnystudio.com/listener for privacy information.

Shows are listed from Apple Podcasts' charts and directory, and Podcast Index where it is used. Every show and episode belongs to its publisher and plays from the publisher's own feed; this site hosts none of them.