Carl Sagan, who would have been 87 years old today, sent a message out to the Universe during his 1977 #XmasLectures. We worked out how far that message would have travelled at the speed of light since then. 🌌 Watch his full lectures, "The Planets" (free/no registration): rigb.org/explore-science/explore/video/planets-earth-planet-1977 | Royal Institution of Great Britain
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Carl Sagan, who would have been 87 years old today, sent a messag…
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