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Royal Institution
rigb.org
did:plc:rwzls6w6m3qnaah56fwpdqqk
Earth's atmosphere was initially rich in hydrogen 🌍 Carl Sagan explained why that changed during his legendary 1977 Christmas Lectures.
Watch the whole series in our online archive: rigb.org/explore-science/explore/video/planets-earth-planet-1977
2025-11-29T19:04:56.396Z