An Astrophysicist's Guide to Black Holes, Higher Dimensions & the Nature of Reality | Janna Levin
In this episode, I sit down with Janna Levin, a theoretical astrophysicist at Barnard College of Columbia University, Guggenheim fellow, and author of Black Hole Survival Guide, Black Hole Blues, A Madman Dreams of Turing Machines, and How the Universe Got Its Spots. Janna started out as a philosophy major drawn to the biggest questions, then found in physics a way of answering them that felt true for everyone, everywhere. Preparing for this conversation blew my mind more than almost any other, and sitting with her only deepened that.
We explore what black holes actually are, why crossing an event horizon involves no drama at all, and why Einstein considered weightlessness the purest experience of gravity. We also look at what may have existed before the Big Bang, the hidden dimensions that could explain why there is something rather than nothing, and why the same ingenuity that sends us to space might also shorten our time here. Janna brings a rare mix of rigor and wonder, and I left this conversation with a renewed sense of awe for our small, remarkable place in the universe.
KEY TAKEAWAYS
Black Holes as Places
When a massive star collapses into a black hole, the star itself keeps falling and leaves behind only curved, empty space. With no material features left to observe, every black hole looks alike, which is why physicists treat them like giant fundamental particles holding clues to quantum gravity.
Gravity as Free Fall
Einstein realized the purest experience of gravity is weightlessness, the feeling of falling freely with no chair, floor, or bed in the way. What we call heaviness is really something resisting our fall, while objects simply follow the natural curves of spacetime.
A Quieter Civilization
Janna suggests technological species may face a bottleneck where the ingenuity that builds rockets also builds bombs. Surviving it could mean reaching a balance with nature so complete that a civilization becomes hard to detect, which may help explain why the cosmos looks so quiet.
JOURNAL PROMPTS
PROMPT 01
When did you last feel real awe at your place in the cosmos, and what made room for it?
PROMPT 02
Which of your greatest strengths could also work against you, and how might you hold it more carefully?
PROMPT 03
What big question are you trying to solve all at once, and what small piece of it could you explore this week?