Albert Einstein - RT @PhysInHistory: Happy 149th Birthday to physicist and astronomer Willem de Sitter (b. OTD in 1872). He is best known for his works in C…

2:19am PDT - May 7th, 2021

RT @PhysInHistory: Happy 149th Birthday to physicist and astronomer Willem de Sitter (b. OTD in 1872). He is best known for his works in C…

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