Which of the following is NOT true about Galileo? Question 3 options: He was such a brilliant mathematician that he became a professor of mathematics at the age of 25. He 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.