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I realize that there are 4 basic forces in our universe.

Two of them are gravity and electromagnetic force.

Electromagnetic travels at the speed of light.

And it seems that Gravity travels/propagates at the speed of light also.

Light is bent by gravity. What about gravity?

Is gravity bent by gravity?

In the picture above. Planet C will see star A1 as in position A2.

What about the gravity? Does C orbit the barycentre of A2-B-C, or the barycenter of A1-B-C?

Thanks