Given a chain of logic for quasar spectra (large redshifts->large recessional velocities->great distance->very luminous), the student is asked to determine which steps are governed by which laws (inverse squares, Doppler formula, Hubble's law).
keywords: quasar, logic, redshifts, recessional velocity, inverse square, Hubble's Law, Doppler
swf file: ca_galaxies_quasarlogic.swf