- Pierre Gassendi observed the transit of Mercury in 1631 and he was shocked to discover the planet’s small size. He and other contemporaries grappled over why it was so much smaller than anyone expected before gradually coming to terms with its implications for cosmic dimensions https://www.theguardian.com/science/the-h-word/2016/may/09/transit-of-mercury-forgotten-astronomical-revolution 4 comments space
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