2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104210Various results are obtained for a Friedmann-Robertson-Walker cosmology. We derive an exact equation that determines Hubble's law, clarify issues concerning the speeds of faraway objects and uncover a "tail-light angle effect" for distant luminous sources. The latter leads to a small, previously unnoticed correction to the parallax distance formula.LaTeX file, 6 figures in postscript format; This paper contains results obtained a few years ago that others might find useful. The work is not being submitted to a journalAstrophysicstext