Change of Measure between Light Travel Time and Euclidean Distances

The problem of cosmological distances is approached using a method based on the propagation of light in an expanding Universe. From the change of measure between Light Travel Time and Euclidean Distances, a formula is derived to compute distances as a function of redshift. This formula is identical to Mattig’s formula (with q0 = 1/2) which is based on Friedmann’s equations of general relativity.