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How fast is light? Today we know: almost 300,000 km per second. But this value wasn’t always known. Even in ancient times, scholars like Aristotle puzzled over the nature of light — and many believed it moved with infinite speed. It wasn’t until 1676 that the Danish astronomer Ole Rømer, through his observations of Jupiter’s moon Io, demonstrated that light takes time to travel over distances. This marked the first proof that the speed of light is finite — one of the greatest discoveries in the history of astronomy. In this video, you’ll learn: • why the ancient Greeks believed in infinite light • how Galileo Galilei made the first attempt to measure it • how Ole Rømer proved the finite speed of light using Io • how Christiaan Huygens calculated the first numerical value • and what exact value we know today With humor, vivid visuals, and clear explanations — perfect for anyone curious about the history of physics and astronomy. ✨ Enjoy watching — and if you liked the video, I’d really appreciate a like 👍 and a subscription 📌!