This is Galileo Galilei he was an Italian scientist, built on stories of astronomy. Galileo built his own telescope in 1609 and use it study heavens.
In 1610 he published a small book called "Starry Messenger", which described his astonishing observations. He announced that Jupiter had four moons and that the sun had dark spots.
In 1632 Galileo published "Dialogue Concerning the Two Chief World System". This book presented the ideas of both Copernicus and Ptolemy, but it clearly showed that Galileo supported the Copernican theory.
Galileo developed into a new approach to science called scientific method. Scientific method is a logical gathering and testing ideas.
Scientific method emphasizes two different types of thinking deductive and inductive reasoning. Using deductive reasoning, scientists start with a theory and test the theory with experiments and observations. for patterns and experiments they used inductive reasoning.