Let's suggest that F is the sun's gravity due to Sirius and F' is the Sirius's gravity from sun.

Newton's theory tells us that F and F' have the same value:GM1M2/RR; with oppsite direction in the same line.

Since the response speed of gravity is light speed but not infinite

and both sun and sirius is moving independently , due to time delay effect

F and F' will not be symmetrical

.

The direction of F is from today's sun to the position where sirius stayed 8 years ago and the direction of F' is from sirius pointing to the location belonging to sun 8 years ago.

This tells us F and F' aren't in the same line!

On the other hand it's impossible for two stars in different scales to lost their mass synchronously

in any periods by shinning. Especially one is growing and another is dying.Therefore the value of F and F' will be never equal. F=GM1M2'/R1R1; F'=GM1'M2/R2R2

Both value and direction is wrongly reported by Newton's gravity law, do I have enough reasons to doubt that something must be wrong with the third law of Newton or his gravity law?

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