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Old November 6th 09, 10:48 AM posted to sci.physics,sci.astro
jacob navia[_2_]
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Default Dark Horse Challenges Dark Matter to Explain Missing Matter

Yousuf Khan a écrit :
MOND explains the rotation curves of galaxies extremely well; Dark
Matter explains the same things not so well. Dark Matter explains
galactic cluster interactions extremely well; MOND explains the same
things not so well. That's the long and short of it.

/Dark Fields/ is an attempt to make MOND work better at the cluster
level. There is a lot of cajoling needed to make Dark Matter work well
within the galactic scale too. So it looks like neither theory works
well outside their on size scale.

SPACE.com -- Dark Horse Challenges Dark Matter to Explain Missing Matter
"When applied to just galaxies, MOND can predict very well the behavior
that astronomers observe. But when MOND is applied to larger structures
like clusters of galaxies, it fails. To make MOND work for clusters, it
must include more complicated concepts, such as entities called dark
fields, which are different from dark matter, but work in a similar way
to alter the amount of gravity present."
http://www.space.com/scienceastronom...ng-matter.html

Yousuf Khan


Now, if you look at a an insect climbing up a wall defying gravity,
it would be impossible to understand without realizing that for an
insect, a set of forces (intermolecular attraction) applies that
for a human climber doing the Everest do not apply at all.

What about this at all scales?

There could be at bigger scales than the galactic scale forces
that appear that are completely unknown and unobservable at smaller
scales.

Galaxy clusters seem to appear at the intersection of galaxy "rivers" that
flow around the "skeleton" of the universe. It could be that this
"skeleton" produces forces that are unknown to us.

Forces that would apply to galaxies, but not within galaxies.

And obviously this skeleton would apply at galaxy cluster scale. In bigger
scales than those, yet ANOTHER forces would apply.

Without end.