Which of the following is not true about Galileo?
He was such a brilliant mathematician that he became a professor of mathematics at the age of 25.
... developed a new and improved thermometer and a better compass.
He designed a telescope 10 times more powerful than earlier models.
He was able to prove that Ptolemy's theory that the moon had a smooth, polished surface was true.
At the Inquisition he signed a paper taking back his radical ideas about the Earth revolving around the sun.
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