What Causes Mass to Attract Each Other?

[markone]

we all know the mass are attract to another mass
so i want know if there are studies and assays to understand really what are the mass

 

[mathman]

Your question looks like an unfinished sentence.

 

[Curl]

General Relativity by Albert Einstein

 

[James A. Putnam]

The empirical evidence, as you know, demonstrates there are variations in resistance to force. For a given force, different objects can obtain different accelerations. This resistance to force is given the name 'mass'. No one knows what mass is. Mass is a cause for resistance to force. We do not know what cause is. All evidence is in the form of effects. Theories can be generated to give the impression that we know what cause is. However, the fact remains that we do not know what cause is. In the case of resistance to force, we do not know why objects resist force.

James