Measuring the Expansion or Contraction of Galaxies
  Galaxies lose mass as a result of their luminosity or gaseous outflows. I
calculate the resulting radial migration of stars outwards and show that it
could potentially be measured with high resolution spectrographs on the next
generation of large telescopes. Substantial accretion of matter in dense cosmic
environments could trigger inward stellar migration that would be even more
easily measurable.
