Quote:
Originally Posted by trinitree88
...That they give redshifted spectra due to the high gravitational redshift (also quoted by Roger Penrose recently as high as 40 % ..) is old hat....
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True, well oldish hat anyway. However up to 20-40% redshift is a far cry from z=5. I had the sense that Jerry was trying to open the door for these things being an alternate explanation for quasars, and so presented a single strong argument against the idea. Note also that the brightest isolated neutron stars (aside from the very newest ones in the Crab and Vela nebulas) are far dimmer in the optical range than huge numbers of quasars with redshifts way over z=0.5.