Spacetime, it is mathematical model which fuses the three dimension of space and one dimension of time. Classical mechanics treats time as universal quantity which is uniform throughout the space. Everything with this spacetime move along the path which is defined as curvature. Gravity is a first fundamental force but now also it is least understood. After the Theory of Special Relativity, it become easy to understood space and time are same entity. The presence of mass and energy curve space time and make it fabric. Therefore another object travelling through this fabric get bent dye to the gravitational source. This is the cause which explain expanding of universe or called stretching of spacetime.
But still the knowledge is incomplete because our less knowledge in Quantum Physics. When large masses move suddenly, some of this space-time curvature ripples outward, spreading in much the way as ripples on the surface of an agitated pond. When two dense objects such as neutron stars or black holes orbit each other, space-time is stirred by their motion and gravitational energy ripples throughout the universe in a manner represented by the picture at lower right.
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