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Does the Universe expand faster than light? #shorts

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Nothing can travel faster than the speed of light. That is one of the most fundamental laws of all of physics. And yet… right now, the Universe appears to be expanding faster than that. Because space itself is expanding, when we look out at distant galaxies they appear to be moving away from us at faster than the speed of light, what’s known as ā€œsuperluminalā€ motion. But Einstein famously showed that nothing can travel faster than light at 300,000km/s in his theory of relativity. It is a speed limit that applies across the entire Universe. At first, this seems like a paradox with a fundamental law of physics somehow getting broken here, but rather counter-intuitively it’s not. Because the key to this isn’t about things moving through space…it’s about what space itself is doing. And even asking this question ā€œof is the universe expanding faster than the speed of lightā€ is a bit of a moot point, because the expansion technically doesn’t have a traditional ā€œspeedā€ either, it’s like asking am I heavier than I am tall? Dive into the Physics behind this cosmic loophole in the full video over on my YouTube channel: https://youtu.be/JeUBLd_4O0Y #astrophysics #universe #expanding #fasterthanlight #paradox #galaxies Video filmed on a Sony āŗ7 IV --- šŸ“š My book, "A Brief History of Black Holes", out NOW in hardback, paperback, e-book and audiobook (which I narrated myself!): http://lnk.to/DrBecky --- šŸ‘• My merch, including JWST designs, are available here (with worldwide shipping!): https://dr-becky.teemill.com/ --- šŸŽ§ Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive --- šŸ”” Don't forget to subscribe and click the little bell icon to be notified when I post a new video! --- šŸ‘©šŸ½ā€šŸ’» I'm Dr. Becky Smethurst, an astrophysicist at the University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars. http://drbecky.uk.com

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