I do not agree with Arp or Narlikar on the mass change theory because it seems untestable to me, and is inadequate.<br /><br />Based on an assumption of gases or matter intergalactically very much is answered why there could be a CMBR, red shift, and dimming of distant objects.<br /><br />CMBR would then come from the cold blackbody from intergalactic matter, but original energy comes from the stars photons going thru space everywhere, some being captured and reemitted.<br /><br />Red shift is the correlating effect of photons and matter now coming into understanding. Quasars, as I understand, seem to have an enormous halo of gas around them.<br /><br />Dimming of distant objects is nothing more than absorption by intergalactic matter.<br /><br />I hope this is adding up for you.<br />