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2.8M views · 47K reactions | 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 | Facebook
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