authentic and that Lorini had amended it to show Galileo in the worst possible light, while the Dini version was generally held to be true. In August 2018 the original manuscript of the letter was discovered in the archives of the Royal Society. This is the letter Galileo sent to Castelli and later asked Castelli to return to him. It shows the edits Galileo made in his own handwriting as he prepared the Dini version, replacing words and phrases that the Inquisition might object to with words less likely to offend. None of the arguments were changed, but the tone of the letter was altered considerably. It is thus certain that the Lorini version was in most respects authentic, while the Dini version was not, as Galileo claimed, a true copy of his original letter. See also Catholic Church and science Criticism of the Bible Galileo affair Scientific Revolution References External links Full text (in Italian) of the Letter to Benedetto Castelli Full text (in English) of the Letter to Benedetto Castelli Michele Camerota, Franco Giudice, Salvatore Ricciardi, "The reappearance of Galileo's original letter to Benedetto Castelli". Galileo Galilei Copernican Revolution Astronomical controversies Scientific revolution