The best way to describe it right now is through general relativity, and the disconnect between classical gravity and all of our known quantum fields is the reason people continue to feverishly ...
All matter has a gravitational field that attracts other objects. The more mass an object has, the greater its gravitational field will be. For example, the Earth has a greater gravitational field ...
It opened up an entire field of physics, but left Einstein with some nagging questions. The problems of gravity and acceleration would not go away. After thinking about the problems for 10 years ...