The Dark Energy Mistake that Fooled Physicists' for 25 Years

🌎 Get an exclusive 15% discount on Saily data plans! Use the code SABINE at checkout. Download the Saily app or go to: https://saily.com/sabine ⛵ About 25 years ago, astrophysicists noticed that the universe’s expansion is accelerating. To account for this observation, physicists came up with a new type of energy – called dark energy – which supposedly makes up more than 75% of the universe, and also has negative pressure. In a new paper, mathematicians claim that dark energy isn’t needed to explain that accelerating expansion, and physicists have been barking up the wrong tree for decades. Let’s take a look. Paper: https://doi.org/10.1098/rspa.2025.0912 #science #physics #universe #cosmos #sciencenews 👕T-shirts, mugs, posters and more: ➜ https://sabines-store.dashery.com/ 💌 Support me on Donorbox ➜ https://donorbox.org/swtg 👉 Transcript with links to references on Patreon ➜ https://www.patreon.com/Sabine 📝 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/ 📩 Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsletter/ 👂 Audio only podcast ➜ https://open.spotify.com/show/0MkNfXlKnMPEUMEeKQYmYC 🔗 Join this channel to get access to perks ➜ https://www.youtube.com/channel/UC1yNl2E66ZzKApQdRuTQ4tw/join 📚 Buy my book ➜ https://amzn.to/3HSAWJW Did physicists make a mistake with dark energy? See why new math suggests we might not need this theory to explain universe expansion. This video explores a recent claim by a group of mathematicians challenging the foundation of dark energy. If their calculations hold up, it would signal a major shift in modern astrophysics. We break down the original observations from 25 years ago that suggested the universe expansion is accelerating and compare them against these new mathematical findings.