Quasars Definition and 60 Threads

Hi all, Just a quick question. Suppose I am traveling at relativistic speeds. An object moving with respect to my frame has undergone spatial contraction. In my frame, does the object's density increase?

I don't know if this belongs in Astronomy or Cosmology, mods, move it if you see fit. As far as I'm aware the idea of Dark Matter was introduced because of the rotation of galaxies. Closer to a galaxy's centre matter should move faster because of the stronger gravitational pull, and further...

Can anyone point me to some good links about the our current understanding of quasars-in particular why they are so far away? and also how they are related to black holes in galaxies? thanks

If quasars are appearing to travel at almost the speed of light from us, what would the relative time frames between us be.

Quasars are known to be the highly luminous neclei at the centre of the galaxy at large red shifts and they emit energy trillions times more than that of sun in form of gamma rays and other radiations. May I know what are the other radiations?...What are the various ways in which celestial...

http://arxiv.org/PS_cache/astro-ph/pdf/0506/0506115.pdf Title: On quasar host galaxies as tests of non-cosmological redshifts Authors: E. Zackrisson Comments: 9 pages, 4 figures Journal-ref: MNRAS 359 (2005), 1193 Despite a general consensus in the astronomical community that all...

If we calculate the distance from us to the nearest quasar, it is huge with a redshift factor nearly equal to 4. Does that make them as old as the universe itself? Do they exist today? Also, why are their 2 inner cores expanding at superluminal velocities?

http://arxiv.org/pdf/astro-ph/0401529 Quasars are closer, less massive, not as bright.

I currently understand that quasars are billions of light years away from us. So the light from those distant quasars that reaches us now, started its journey a billion years ago. When we examine quasars today we are really looking at something that existed a very long time ago and very far...

Recently I heard about Halton Arp's work to disprove the current interpretation of redshift. However, a Google search turned up no "real" sites discussing this. So I bring my question here: is there anything to his work? Apparently he says that quasars are ejected from Seyfert galaxies or...