Galileo Galilee (A.D. 1564-1642) was a sciencist. He was born at Pisa, Italy in 1564. He gave the true method of physical research by combining observation and induction with mathematical deduction tested by experiments.

He was the first man to point out that the path of a projectile would be a parabola, resolving its motion into a horizontal component which keeps constant, and a vertical component which follows the laws of failing bodies.

He was always fascinated in devising various instruments and pieces of machinery, this led him to invent telescope in 1609. He detected the presence of black spots on the moon as hills and valleys and spots of the sun with his telescope. He also discovered the principle of pendulum. His observations confirmed his belief that the Earth rotates about its axis and moves around the sun.

It is interesting to point out that the most modern version of Galileo’s telescope, known as Hubble space Telescope (cost $ 1.5 billion) was launched in the earth’s orbit in April 1991- four centuries after his discovery. This telescope will look into the past and the origin of the Universe.

 In the early part of the 17th century,Galileo agreed with the Copernican view that earth moved around the sun.he also demolished Aristotle's falling-body hypothesis..

By dropping objects of various weights from the learning tower of Pisa,Galileo was able to disapprove the long-time accepted theory of Aristotle w/c states that heavy objects would fall faster than light objects..
But Galileo through his experiment found out that objects of different weights,when released at the same time and at the same elevation,would fall and hit the ground at the same time,except when air resistance is present..