Suppose that there exists a special universe,in this universe, only have two congruent stars A and B, stars A side always facing the star B (similar to the moon is always only one side toward the Earth), star B in a certain angular velocity of rotation.(adsbygoogle = window.adsbygoogle || []).push({});

In a super observer's vision, the two stars around the same center of site O in circular motion, then the centrifugal force and gravitational forces just cancel each other out.

I want to kow:

1.In the star A, a observer A, what will he understand the movement of the two stars?

2.In the star B, a observer B, what will he understand the movement of the two stars?

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# A question about how to understand the relativity

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