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Author Topic:   The problems of big bang theory. What are they?
jackal5096
Inactive Member


Message 30 of 389 (400241)
05-11-2007 2:16 PM
Reply to: Message 8 by Zhimbo
04-23-2007 8:05 PM


quote:
You can't tell just by looking if a quasar is in front of a galaxy. Galaxies aren't solid masses, so it's quite possible to see through them.
If that were so, why do so many astronomers brag about using gravitational lensing to see behind a galaxy?
For example, in this NASA photo NASA claims that a single quasar, located behind the galaxy, appears four times, in four quadrants, around the galaxy in front of it, due to gravitational lensing. Yet, the quasar is not directly visible through the galaxy.

This message is a reply to:
 Message 8 by Zhimbo, posted 04-23-2007 8:05 PM Zhimbo has not replied

Replies to this message:
 Message 33 by Dr Adequate, posted 05-11-2007 8:53 PM jackal5096 has replied

jackal5096
Inactive Member


Message 31 of 389 (400243)
05-11-2007 2:29 PM
Reply to: Message 13 by cavediver
04-24-2007 3:52 AM


re: An Open Letter to the Scientific Community
quote:
Yes, started by Halton Arp and cronies. Halton has invested pretty much his whole life in his own theories of cosmology and just cannot bear to let go - despite being in a desperate minority and despite having each bit of "evidence" he brings forth refuted and explained (though to be fair sometimes these refutations and explanations take a little time to come forth)
While a number of predictions of Arp's plasma universe have been refuted, what is becoming increasingly interesting is the so-called "cosmic axis of evil", first noted with the WMAP CMB analyses, in which the quadrapole and octapole anisotropies in the CMB appear to be aligned with the Milky Way axis. Since then, the polarizations of the light from quasars and the axis of many other spiral galaxies also seemed to be alighed with this cosmic axis of evil.
One recent paper poses an explanation for this apparent cosmic axis as a pan-universal magnetic field. Hmm, where've I heard that before, Halton?

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 Message 13 by cavediver, posted 04-24-2007 3:52 AM cavediver has not replied

Replies to this message:
 Message 32 by Percy, posted 05-11-2007 4:04 PM jackal5096 has replied

jackal5096
Inactive Member


Message 34 of 389 (400296)
05-11-2007 11:24 PM
Reply to: Message 32 by Percy
05-11-2007 4:04 PM


re: An Open Letter to the Scientific Community
quote:
Arp's plasma universe? Are you perhaps thinking of Hannes Alfvén?
Oops, you're right. I was actually thinking of Alfven.
Or maybe Eric Lerner.

This message is a reply to:
 Message 32 by Percy, posted 05-11-2007 4:04 PM Percy has seen this message but not replied

jackal5096
Inactive Member


Message 35 of 389 (400297)
05-11-2007 11:26 PM
Reply to: Message 33 by Dr Adequate
05-11-2007 8:53 PM


quote:
What's important is not that they're seeing behind a glaxy, but that they're seeing gravitational lensing. This is what they're bragging about.
But the point was that the use of gravitational lensing showed that there was a quasar present behind the galaxy, that wasn't visible looking through the galaxy, contrary to the post to which I responded.

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 Message 33 by Dr Adequate, posted 05-11-2007 8:53 PM Dr Adequate has not replied

Replies to this message:
 Message 38 by Zhimbo, posted 05-26-2007 10:38 AM jackal5096 has replied

jackal5096
Inactive Member


Message 41 of 389 (402482)
05-27-2007 11:39 AM
Reply to: Message 38 by Zhimbo
05-26-2007 10:38 AM


quote:
Why aren't these galaxies being "lensed" by the closer M101? Because detectable lensing is by far the exception, not the rule.
So what? How does that determine whether a more distant quasar can be seen through a galaxy. Even with perfectly aligned lensing being "the exception", in this case it provided a rare opportunity to show that a quasar is present behind a galaxy without being visible directly through the galaxy.
quote:
Consider:
quote:
"In fact,M101’s disk is so thin that the Hubble telescope easily sees many more distant galaxies lying behind it.Seeing these background galaxies shows that a galaxy’s disk is really mostly empty space."
This looks like little more than a red herring. The Hubble photos of the pinwheel galaxy are, as it states, of the thin disk. In contrast, the quasar aligned with NGC 7319 is aligned with the central core of that galaxy, which is much thicker and much more opaque, making it less likely the quasar is behind the galaxy

This message is a reply to:
 Message 38 by Zhimbo, posted 05-26-2007 10:38 AM Zhimbo has replied

Replies to this message:
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