Speaking of laws....
Big Al seems to have gotten it right....
Einstein's Theory of General Relativity
has been validated on a Galactic Scale,
as reported by Maya Miller at Scientific American.
General relativity thus, using Miller's language,
correctly describes "gravity at cosmological scales".
As Miller writes:
"The results also indirectly support the theory’s validity
in the face of dark matter, dark energy
and other cosmological curveballs."
See also Einstein's Voice.