THE INFLUENCE OF COSMOLOGICAL REMOTENESS ON ATOMIC, MOLECULAR AND COLLISION PROPERTIES AND OBSERVATIONS Felix T. Smith SRI International, Menlo Park, CA, USA New developments in relativistic dynamics in an open, expanding, hyperbolic universe lead to the conclusion that the light speed $c$ varies inversely with the age and scale length $R(t)$ of the universe, so that $c(t)R(t)=S$ is a constant. The fine structure constant and influential dimensionless ratios like $h\nu /kT$ remain invariant. Consequences for atomic, molecular and collision properties and possibilities for their measurement will be examined.