Galileo Galilei constructed his telescope after he heard that a Flemish lens grinder created a new type of glass that could magnify faraway objects. This allowed him to make important discoveries that he would later put in his book The Starry Messenger. For example, he discovered that the moon had mountains and craters. Discoveries like this were shocking to many Europeans since they made Europeans more aware of the actual appearance of the universe, not to mention that they also disproved Aristotle’s assumption that the other celestial bodies were perfect and unchanging. The Catholic Church felt threatened by Galileo’s discoveries since their views on their universe could be demolished by these discoveries. It doesn’t help that the geocentric
