Quote:
Originally Posted by Mav
Can l lodge a protest on this one.
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Yes you may .... replaced by ....
3C
273, the object number 273 in the third Cambridge Catalogue of radio sources, is the brightest and at least one of nearest of all quasars (acronym for "QUASi-stellAR radio sources"), i.e. it appears stellar in telescopes. This one shows its spectral lines shifted to the red by 16 %, so that this object appears to recede from us at 16 % of the speed of light, or about 48,000 km/sec. Applying Hubble's expansion law, this recession velocity corresponds to a distance of about 640 Mpc, or about 2 billion light years (H0=75 assumed; H0=60 would correspond to a distance of 2.6 billion light years).
(Bet you wish you hadn't protested now!)
As for post #356 .. MrDK could you elaborate to E-R please.