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Re: Re: Polar Jets Of Neutron Stars (NS) And Black Holes (BH).

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Posted by Mournblade on January 31, 2001 13:51:09 UTC

Now what raises a question is if the ejection of matter ( mass irrelavant ) reaches such high velocities then why do we not see these jets of matter curve in combination to an assumed expanding universe .

One can answer the question with it is the space inbetween the galaxies that is expanding , but lets not forget that the accretion disk is also carrying a high velocity spin , enough to show it is being ejected from the accretion disk , so why is this not observed , you have all seen a cartwheel being lit at bonfire night or some celebration , they have a high spin so what would occur if they suddenly gave off jets .

As explained elsewhere the expansion of the Universe only becomes significant across hundreds of megaparsecs. On these scales galaxies are considered point sources and black holes are negligble. A jet only a few thousand light years across feels no affect from the Universes expansion.

Some Quasar jets have been observed with superluminal velocities. This is because the speed of light is only a constant within our local frame of reference, the quasar is hardly local the jets are near c and the quasar has a velocity that is a large fraction of c. This creates an optical illusion that the jets have v>c.

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