Earth’s Day Was Shorter 380 Million Years Ago – Coral Fossils Reveal

Earth’s Day Used to Be Shorter Hey, you guys remember how we were taught that a day on Earth has always been 24 hours? Well, guess what? It turns out that’s not exactly true. It’s wild to think about, right? Apparently, the planet has been slowly losing speed over billions of years. Coral Fossils Give Us a Clue So, how do we know this? I’m glad you asked. Scientists have been looking at ancient coral fossils, and it seems that around 380 million years ago – that’s way before dinosaurs even existed – an Earth day was only about 22 hours long! Can you believe it? I remember being told about tidal friction, you know? It’s like when the ocean’s tides slow down Earth’s rotation a bit. It’s happening all the time, but it’s so gradual we don’t notice it. But, here’s the kicker: the Moon is also affected. As Earth slows down, the Moon moves away from us, just a little bit. Over millions of years, that little bit adds up. It’s like watching paint dry, but on a cosmic scale. Implications and Why This Matters Why should we care about this? Well, it’s not like we need to start adjusting our watches or anything. But it does give us a better understanding of how the Earth and the Moon are connected in this cosmic dance. It’s just another reminder of how dynamic our planet really is – and it’s always changing, even if it takes millions of years for us to notice.