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also i think the G formula is wrong,because it`s used for variables calculation which are already estimated with G...for example,we calculate firstly distance between sun and earth and then earth and sun masses...all planets are supposed to have a mass and radius,but nothing it`s said about their move,although `radius` is because of spinning(implicit)...
"Assuming SI units, F is measured in newtons (N), m1 and m2 in kilograms (kg), r in meters (m), and the constant G is approximately equal to 6.674×10−11 N m2 kg−2."
`I think the best way to measure G would be to put a pair of reference masses into solar orbit away from any other orbiting bodies. Each of the two reference masses should have a retro-reflective target.`you think,but you never did or will...because you cannot do it...and never will know the answer...