Something existed before time. Something may outlast this universe. The real question is not whether the multiverse is real but which infinity we already live inside. Experimental cosmologist Brian Keating (UC San Diego, BICEP, Simons Observatory) sat down with Gleb Solomin to push on the questions cosmology cannot answer with data yet. We cover: what "before the Big Bang" even means when spacetime itself begins at the Big Bang, whether the standard origin story survives the latest tension in the dark energy measurements, why a multiverse you cannot test is philosophy wearing a lab coat, the gap between mathematical elegance and experimental proof, and why string theory's beauty is exactly what should make you suspicious of it. Modern physics may have hit a wall that mathematics alone cannot climb. This is a conversation about where that wall is. --- 📬 Get the transcript, fascinating bonus content, and my Monday M.A.G.I.C. Message: https://briankeating.com/yt 🌠 Have a .edu email and live in the USA 🇺🇸? You automatically win a meteorite: https://BrianKeating.com/edu 🔔 Subscribe: https://www.youtube.com/DrBrianKeating?sub_confirmation=1 🎯 Support Into the Impossible on Patreon — get my weekly M.A.G.I.C. Message, unfiltered bonus content, and live monthly Office Hours with me: https://www.patreon.com/drbriankeating ⭐ Join this channel for perks, monthly Office Hours, and your name in the Member Roster at the end of every episode: https://www.youtube.com/channel/UCmXH_moPhfkqCk6S3b9RWuw/join 📚 My books: Losing the Nobel Prize (memoir): http://amzn.to/2sa5UpA Think Like a Nobel Prize Winner: https://a.co/d/03ezQFu Focus Like a Nobel Prize Winner: https://a.co/d/hi50U9U Galileo's Dialogue (first-ever audiobook): https://a.co/d/iZPi9Un 🌐 More: 🏄‍♂️ Twitter: https://twitter.com/BrianKeating 📚 Substack: https://briankeating.substack.com/ss ✍️ Blog: https://briankeating.com/blog 🎙️ Audio-only: https://briankeating.com/podcast