Re: Dark matter

On Sep 16, 10:31 am, "Mike Dworetsky"
<platinum...@xxxxxxxxxxxxxxxxxxxx> wrote:
"Friar Broccoli" <Elia...@xxxxxxxxx> wrote in message

news:1189942543.215372.234660@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

On Sep 16, 4:37 am, "Mike Dworetsky"
<platinum...@xxxxxxxxxxxxxxxxxxxx> wrote:

Yes other evidence for it includes the rotation of galaxies and
gravitational lensing of distant objects by clusters of galaxies.

I assume that MOND could also account for the lensing?
Presumably, if gravity is stronger for the purposes of attracting
stars and other masses, it is also stronger for producing a
gravitational lens.

I presume you could kill MOND by demonstrating lumping of
dark matter in locations different from anything detectable.
I don't recall hearing about any evidence for this. Have you?

Hmm, I think I need to check with some expert guys in my department. IANA
cosmologist. MOND is not finished off yet, but ISTR some recent
measurements have put severe limitations on it.


Google hasn't been working quite right for usenet lately so I'm
not certain I haven't already asked you this but

Since you work in an astronomy department and are asking
something else anyway, I have a long standing request/need for
information (a citable source) on the decreasing amounts of
heavy elements in gas clouds the further out in space we look.

I read a nice simple article on this maybe five years ago, but
can no longer find it or any equivalent info on the net. As I
recall the authors used a few quasars for back lighting and then
determined what was in the clouds at various redshifts using the
hydrogen absorption lines etc as the calibration point in each
cloud.

I need it, because I like to handle the "light was faster in the
past" argument, and this is direct evidence that the light
passed through clouds that were then younger, and thus that the
light is old.

(Yes I know [vaguely] about the finds of very early stars with
high metal content. I wouldn't mind more comments on this but I
don't see it as a big problem)


Cordially;

Friar Broccoli
Robert Keith Elias, Quebec, Canada Email: EliasRK (of) gmail * com
Best programmer's & all purpose text editor: http://www.semware.com

--------- I consider ALL arguments in support of my views ---------

.

Relevant Pages

  • Re: Dark matter
    ... if gravity is stronger for the purposes of attracting ... heavy elements in gas clouds the further out in space we look. ... There is of course direct evidence that the fine structure constant is not ...
    (talk.origins)
  • Re: Dark matter
    ... if gravity is stronger for the purposes of attracting ... heavy elements in gas clouds the further out in space we look. ... There is of course direct evidence that the fine structure constant is not ...
    (talk.origins)
  • Re: Need some assistance
    ... a lot of the other things in the universe. ... because we used to think spiral galaxies were nebular clouds. ... General Relativity says that gravity is the curvature of absolute ... Einstein said that there is no Newtonian attractive instantaneous ...
    (talk.origins)
  • Re: AKICIF: Full moon on Friday the 13th
    ... > atmosphere might be fun, ... > head in the clouds? ... But who says the gravity has to be 1 G? ... that would account for an eclipse every 15 ...
    (rec.arts.sf.fandom)
  • Re: assumption or evidence?
    ... That is the ratio 10^56/10^43. ... if weaker forces are 10^43 magnitude ratio to gravity, ... momentum transfer you get per unit charge, is stronger. ... to do with reality, so its impossibility is not a big concern. ...
    (sci.physics.relativity)