What Causes Gravity?

I have been researching about gravity and it said that gravity is one of the four fundamental  forces of the universe and is considered a non-contact force. The first person to describe it were people could understand what gravity was, was Isaac Newton. Isaac Newton used the universal law of gravitation to describe how gravity works. He gave the foundations of physics. The greater the mass and the closer the two objects are, the stronger the force of gravity. Also Isaac Newton was the first person to find out what gravity was. After Isaac Newton found gravity Albert Eisenstein came along and  he stated that gravity was simply a curvature in space-time created by a mass object pretty much in the same way a piece of cloth would be curved if it was stretched out and a heft object was placed on it. Other people who studied gravity are...Henry Cavendish, Stephen Hawking, Galileo Galilei, Pierre De Fermat, and Christiaan Huygens. 

I found most of my info HERE & HERE.

Some of my info came from HERE.