$$ Golden Boar wrote:
Why is the amount of bending of light
twice the value predicted by Newton's laws?
Is this because photons are gravitaionally attracted
twice as much as massive particles?

$$ The coup-GR didN'T know that Newton typically neglected M1 motion.
$$ [Clearly HOWEVER, this is NOT TRUE for ANY two more-SiMiLAR mass].

1. SR & GR ..no barycentre.
$$ SR had M1 at REST ..permanantly, in theory.
$$ GR didN'T have M1 at REST ..permanantly, in theory, as SR did.
$$ [ SR and GR ..*BOTH*, eliminate the *point-in-common* ].
$$ Newton ..with (n - 1), gives the EXACT answer.

2. SR & GR ..no ambient density.
$$ Note GR substitutes "SPACE-time curvature", in place of "ambient".
$$ [The bending of light is ACTUALLY "ambient gradient DiFFRACTiON"].
$$ [i.e. There is DiFFRACTiON. Therefore there is AMBiENT media].

3. SR & GR ..no test mass field.
$$ Note, where-as M1 had a field ..the TEST mass m1 HAD no "FiELD".
$$ [Therefore, TWO (2) photons *caN'T BE* attracted to EACH other].
$$ [This means in GR YOU HAVE to CHOOSE WHiCH one attracts others].

$$ Newton PROFOUNDLY simplified the n-body problem to just two (2).
$$ [THEN with (n - 1) CORRECTiNG Newton, ANOTHER body is included].
$$ [THEN with (n - 1) CORRECTiNG Newton, ANOTHER mass mS is added].

$$ SR & GR "linear" means "no barycentre". i.e. No CENTRO-symmetry.
$$ [From a political perspective ALL the talk is THEN of symmetry].

$$ GR with NO test field AND a GR-SUBSTiTUTED-ambient, is just WRONG.
$$ [Albeit, "predicting" the "correct" NUMBER after TWEAKiNG it ALL].

Go-go NETSCAPE news alt.science.nanotech WHY m1*v1=M1*v. .
A question about the bending of light.
Newton ..with (n - 1), gives the EXACT answer. ..End of POST.