Re: dark matter question

On Feb 23, 3:30 pm, "gb6...@xxxxxxxxx" <gb6...@xxxxxxxxx> wrote:
The milky way has 20x (400x?) more dark matter than normal matter.
The sun moves around 217 km/sec around the galactic core. Something
going much faster than that is going to have escape velocity, and
leave the galaxy. Neutrinos travelling near the speed of light will
leave the galaxy, so the milky way's dark matter isn't neutrinos.

There is not enough gravity to hold the galaxy together. According
to calculations of mass, the galaxy should fly apart. What holds
it together according to calculations is dark matter, without it
there is not enough matter to keep it all together.





If a particle of dark matter passes a star, they'll deflect each other
gravitationally, with energy and momentum conserved. Gases do the
same thing, you could think of the star and the dark matter particle
as gas particles. In a gas, particles tend towards the same energy
("temperature"). Barnard's star is going about 140 km/sec relative to
the sun.

If dark matter particles are light, oh, lighter than Jupiter, this
start/darkmatter gas is going to end up giving the dark matter
particles speeds much greater than the stars. This may take awhile,
because gravitational deflection is less the faster things go (the
earth orbits the sun at 29km/sec). The dark matter particles will
pick up speed until they leave the galaxy. The stars will experience
drag, tending toward the galactic plane and galactic center.

That suggest dark matter particles (blobs, objects) are heavy. If
they weren't, they wouldn't stay in the galaxy for long. If they
aren't heavy, perhaps we can see some evidence of drag on stars moving
fast relative to their surroundings.

That's apparently what it is: an energy like gravity that gives speed
to
matter.

Great leaders are grandio psychopaths of a system who don't listen and
are always criminal, and determined with ideas like killing millions
if
necessary. This determination is a klan.

Exuse me.

And they feed this determination into every corner of THEIR society.


.

Relevant Pages

  • New analysis puts dark matter back into elliptical galaxies (Forwarded)
    ... This theory faced a challenge in 2003, when a team of astronomers reported a surprising absence of dark matter in elliptical galaxies. ... But a new analysis published in the September 29 issue of the journal Nature provides an explanation for the earlier observations that fits comfortably with the standard theory and puts the dark matter back into elliptical galaxies. ... "A dearth of dark matter in elliptical galaxies is especially puzzling in the context of the standard theory of galaxy formation, which assumes that ellipticals originate from mergers of disk galaxies," added Avishai Dekel, professor of physics at the Hebrew University of Jerusalem and first author of the Nature paper. ... Whereas spiral galaxies are dominated by flattened, rotating disks of stars and gas, elliptical galaxies are round, smooth collections of stars. ...
    (sci.astro)
  • Re: dark matter question
    ... leave the galaxy, so the milky way's dark matter isn't neutrinos. ... you could think of the star and the dark matter particle ... particles speeds much greater than the stars. ...
    (sci.astro)
  • Re: dark matter question
    ... leave the galaxy, so the milky way's dark matter isn't neutrinos. ... you could think of the star and the dark matter particle ... particles speeds much greater than the stars. ...
    (sci.astro)
  • Re: dark matter question
    ... so the milky way's dark matter isn't neutrinos. ... you could think of the star and the dark matter particle ... particles speeds much greater than the stars. ... The Universe and dark energy is like a tank government ...
    (sci.astro)
  • Re: Question Galactic Supernova
    ... There must be some conditions under which a galaxy can collapse in on ... What would happen if a smaller galaxy spiralled into a bigger one and ended ... Sam Wormley mentions dark matter, ... not affect stars, although the shock to the ISM of both galaxies may ...
    (sci.physics)