389K views · 17K reactions | Just how old is the universe? And how brief is all of human history? It's hard to wrap your head around, but the concept of a Cosmic Calendar, first popularized by astronomer Carl Sagan in the 1970s, helps put it all into context... And it is pretty astonishing! 勞 #cosmiccalendar #thebigbang #carlsagan #theuniverse #museumofscience #boston #scienceforall | Museum of Science, Boston | Facebook
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389K views · 17K reactions | Just how old is the universe? And how …
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