In 1632, after years of silence on the Copernican issue, Galileo published his Dialogo dei due massimi sistemi del mondo (Dialogue on Two Chief World Systems). The Inquisition summoned the aged author to Rome, where he was examined and threatened with torture. Galileo recanted and was sentenced to house arrest for the remainder of his life. As he rose from his knees after making a solem renunciation of the Copernican doctrine, he was heard to mutter, "Eppur si muove" (But still, it moves).