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YouTubeThe Royal Institution
Why Earth's atmosphere changed #carlsagan #science
Earth's atmosphere was initially rich in hydrogen 🌍 Carl Sagan explained why that changed during his legendary 1977 Christmas Lectures. For more out-of-this-world science, don't miss the 2025 Christmas Lectures, with Maggie Aderin-Pocock— they'll be on iPlayer in the UK in late December, and Premiered here on our YouTube channel at 7pm GMT ...
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