Galileo was one of the first people to study the sky with a telescope. He was the first person to discover moons orbiting another planet, discovering Jupiter’s four largest moons.
He found that Venus has stages like our moon – the main useful instead of scientific proof that the sun is at the focal point of the close planetary system. He found the Law of the Pendulum.
He found that gravity quickens all things similarly, paying little mind to mass, and that increasing speed of articles by gravity is relative to the square of the time they have been falling.
He expressed the rule of latency – at the end of the day he found Newton's First Law of Motion.
His revelations in the field of mechanics broke the mixed up material science of Aristotle that had overwhelmed Western idea for two centuries.