Which of the following is not true about Galileo -he developed a new and Improved thermometer and better compass.

-He designed a telescope 10 times more powerful than earlier models

-he was such a brilliant mathematician that he became a professor at the age of 25

-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

PLEASE HELP