"Last Timer" wrote in message
oups.com...

Uncle Al wrote:
George Kinley wrote:

Hi,
If our galaxy is rotating around other group of galaxy under
influenece
of combined gravity of galaxies, which mean that combined gravity
of
all the galaxy should be more then gravity of individual black hole
present in the centre of every galaxy, so how does light travel
under
such emmence gravity

1/r^2

So you are saying light is made of particles with mass or just a whimsy
that decides to visit a blackhole because the source it came from made
it so?

Uncle Al is aware of null geodesics whereof the photon's
effective potential is given by ( G = c = 1 )

W_eff = [ 1 / r^2 ] [ 1 - 2M / r ]

for r 2M , W_eff = 1 / r^2 (as per Uncle Al)

Which has the same radial dependence as that of orbital
angular momentum. Replacing r with r' such that,
r' = r / M, the photon's trajectory depends only upon
the initial impact parameter.

[Old Man]