Galileo was an Italian astronomer who

Galileo was an Italian astronomer who developed the telescope, discovered four satellites of Jupiter and discovered that the movement of pendulum produces a regular time measurement. Galileo was an Italian astronomer, mathematician, physicist, philosopher and professor who made pioneering observations of nature with long-lasting implications for the study of physics. He also constructed a telescope and supported the Copernican theory, which supports a sun-centered solar system.