Theoretical Physicist. Astrophysicist. Book lover and writer. Professor Barnard/Columbia. Founding Director of Sciences @PioneerWorks, Founding editor-in-chief of Broadcast. Co-host of @quantamagazine podcast "The Joy of Why"https://bsky.app/profile/jannalevinastro.bsky.socialhttps://bsky.app/profile/jannalevinastro.bsky.social/post/3mdt2dtgq7s2uPalette Cleanser. Does the Universe Have Hidden Depths? https://jannalevin.substack.com/p/does-the-universe-have-hidden-depths01 Feb 2026 19:18 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3mdt2dtgq7s2uhttps://bsky.app/profile/jannalevinastro.bsky.social/post/3mdrcusxxek2pFolks, let’s calibrate. I might on rare occasion contribute in defense of science on a news channel. Yet we are all contributors to this channel. And the egregious spread of misinformation with malicious intent is happening here where we all contribute. Shouldn’t that give us pause?01 Feb 2026 02:46 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3mdrcusxxek2phttps://bsky.app/profile/jannalevinastro.bsky.social/post/3mdnlz2sic22lI mean there is no climate denial. There is plenty of irony. Haha. The piece is about the transcendent physical law that connects us, a heating Earth, & the universe. Written with love [contains quote post or other embedded content]30 Jan 2026 15:18 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3mdnlz2sic22lhttps://bsky.app/profile/jannalevinastro.bsky.social/post/3mdnlwpu76c2lI wrote a piece in defense of our warming planet for Climate Week. Some people, clearly without having read it, are contorting themselves to find climate denial there. Oh the irony. I assure there is none. I invest a lot of time and energy in support of climate scientists fighting the good fight. https://jannalevin.substack.com/p/hot-bodies30 Jan 2026 15:17 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3mdnlwpu76c2lhttps://bsky.app/profile/jannalevinastro.bsky.social/post/3mdktjehifk25I'm so glad to see this paper posted. Such a fascinating phenomenon hiding in the Klein bottle. We found a fermion condensate that breaks CP invariance. The follow up paper discusses how this might explain the genesis of a matter excess over antimatter arxiv.org/abs/2511.23447 [contains quote post or other embedded content]29 Jan 2026 12:55 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3mdktjehifk25https://bsky.app/profile/jannalevinastro.bsky.social/post/3mavj35cqnc2jDue to the wobbling of the Earth’s axis, the constellations have shifted backward by roughly one sign since they were defined a couple of thousand years ago. As a result of this revolution, the Sun is actually in Sagittarius now, not Capricorn as the astrological zodiac claims.26 Dec 2025 14:32 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3mavj35cqnc2jhttps://bsky.app/profile/jannalevinastro.bsky.social/post/3maj32uglt22qI slept through the winter solstice at 10:03am, a near undetectable moment when the sun reaches its most southernly point in the sky for the Northern Hemisphere. The tilt of the Earth's axis brings winter north and summer south. A glint of optimism as the days promise to get longer21 Dec 2025 15:49 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3maj32uglt22qhttps://bsky.app/profile/jannalevinastro.bsky.social/post/3lwoyeznr5c2wThis piece originally appeared in “When We Were Kids: How a Child Becomes a Scientists.” The book features a remarkable contributor list—Kurzweil, Dennett, Dawkins, Margulis, Dyson. I’ve included the Table of Contents at the close of this dispatch. https://open.substack.com/pub/jannalevin/p/curious-minds?r=cwnv9&utm_campaign=post&utm_medium=web&showWelcomeOnShare=false18 Aug 2025 18:05 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3lwoyeznr5c2whttps://bsky.app/profile/jannalevinastro.bsky.social/post/3lv73oi6coc2dAnd Now For Something Not Exactly Completely Different. The upward lightcone emanating from the origin isthe causal future and the downward lightcone is the causal past. Tune in, tune out with a rare groove and yet another level of understanding by DJ Black Helmut. Read more: jannalevin.substack.com https://open.substack.com/pub/jannalevin/p/and-now-for-something-not-exactly?r=cwnv9&utm_campaign=post&utm_medium=web&showWelcomeOnShare=false30 Jul 2025 16:56 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3lv73oi6coc2dhttps://bsky.app/profile/jannalevinastro.bsky.social/post/3ltml4qpgbs23Ah, for more on life in the universe, we just published a conversation, Scientific Controversies: Aliens, https://www.youtube.com/watch?v=CLlKQZkafBo&t=45s [contains quote post or other embedded content]10 Jul 2025 14:47 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3ltml4qpgbs23https://bsky.app/profile/jannalevinastro.bsky.social/post/3ltkl4jgfxs2oBillions of Exoplanets, Zero Aliens? This week, a rumination on UFO’s, disharmonious species, and extraterrestrials, inspired by Scientific Controversies: Aliens, a live event I hosted recently at Pioneer Works with astronomers Adam Frank and David Kipping. https://open.substack.com/pub/jannalevin/p/billions-of-exoplanets-zero-aliens https://open.substack.com/pub/jannalevin/p/billions-of-exoplanets-zero-aliens?r=cwnv9&utm_campaign=post&utm_medium=web&showWelcomeOnShare=false09 Jul 2025 19:41 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3ltkl4jgfxs2ohttps://bsky.app/profile/jannalevinastro.bsky.social/post/3lsyly24nn226I was chatting with a friend over some kind of caffeinated beverage when he asked me, “Why Black Holes?” Here is my response–after I said, “Seriously. You haven’t read my books?” Why Black Holes? by @JannaLevin https://open.substack.com/pub/jannalevin/p/why-black-holes? https://open.substack.com/pub/jannalevin/p/why-black-holes?r=cwnv9&utm_campaign=post&utm_medium=web&showWelcomeOnShare=false02 Jul 2025 16:09 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3lsyly24nn226https://bsky.app/profile/jannalevinastro.bsky.social/post/3lp7ignnx6k23Are the Aliens Hiding? | Janna Levin and @lexfridman.bsky.social https://youtu.be/FcbQ3eZ6yC8?si=wj5bauvLOXkdD50215 May 2025 12:13 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3lp7ignnx6k23https://bsky.app/profile/jannalevinastro.bsky.social/post/3llwjz347rm2nEwin Tang went to college at 14. As a senior, she upended a claim about quantum computers by proving that a classical algorithm could outperform its quantum counterpart. Catch my convo with Ewin on this week’s episode of “The Joy of Why,” from @quantamagazine [contains quote post or other embedded content]03 Apr 2025 18:32 +0000at://did:plc:g3w2aaarsc5vzh2kokfpc2ir/app.bsky.feed.post/3llwjz347rm2n