The original letter in which Galileo argued against the doctrine...
The original letter in which Galileo argued against the doctrine of the Roman Catholic Church has been rediscovered in London.
Credit: The Royal Society
Via Nature: Discovery of Galileo’s long-lost letter shows he edited his heretical ideas to fool the Inquisition
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There seems there is nothing new or unknown on this find. I recommend taking a look at his essay (in the form of a letter to the Grand Duchess Christina) written in 1615 (around the time the above letter was also written):