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Einstein uttered that the gravity force -which acts on all Universe objects- is not more than a curvature of the space-time.
An analogy, in few words, to explain this device:
Universe is like a sheet catch only by the four corners (actually is a space-time four-dimensional).
When you place a heavy object (in the General Relativity Theory, it is an object with mass), the sheet is become deformed due to the weight of this first object and a well shows up.
So, if now you place a second object, this one will fall to the well where is the first object (the creator of this well).
It is as if the first object attracted the second object (Force of the Gravity) but simply the second object finishes where it is the first object due to a deformation of the sheet (in the General Relativity Theory, it is a deformation of the space-time).
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