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Newton's law of gravity while right most of the time, was incorrect when talking about very large and very distant objects.  Einstein revised Newton's laws of gravity to make them more accurate. We call what he developed the theory of relativity.

It is actually two theories. The first is called Special Relativity. This theory states that  all movement is relative to other objects.For example,relative to the Earth, most meteorites move at about 25,000 miles an hour (40,233 km), but if you were standing on a meteorite looking at another meteorite going in the same direction as you and at the same speed, it would not appear to move at all.Special Relativity also says that the speed of light is always constant.  

The Theory of General Relativity is the one which redefined the laws of gravity.Einstein determined that massive objects cause a distortion in space-time, which is felt as gravity. In other words,gravity itself is not a force but an area of space created by the presence of mass itself.