What is Gravitation?

This article analyses the nature of classical Newtonian gravity beginning with Galileo's experiments and the paradox that ensues from Aristotle's law of falling bodies, delving on the notions of inertial and gravitational masses. Arguing that Newton's gravity law is inconsistent with relativity, it briefly describes Einstein's relativistic theory of gravity, pointing out the importance of weak equivalence principle in the formulation of general theory of relativity. It also provides a short discussion on an important prediction of general relativity, namely, the existence of gravitational waves and the attempts to detect them. Finally, the article touches on the current challenges facing the gravity researchers.