Question about radiation pressure

Question about radiation pressure


We know several examples where radiation pressure is overcoming
gravity: for example the tail of comets or the formation of solar
systems.

The main reason is that the effect of radiation pressure increases
when the size of the particles decreases.

For example radiation pressure from the Sun is stronger than gravity
for atoms of hydrogen. It is even enforced for dust grains of a
particular size.

If that is true in the vicinity of the Sun, that is still true 2
MegaParsecs away, as both radiation pressure and gravity propagate as
1/d^2.

So stars are not attracting atoms and dust, but repel these.

According to current estimations, a large part of the mass of galaxies
is made of hydrogen and dust.

Now consider the effect of radiation pressure from one galaxy to
another galaxy: if an important part of the galaxy is made of
hydrogen, an important part of that action should be repulsion and not
attraction.

So my question is:

If there is an important repulsion exerted on hydrogen and if hydrogen
is prevalent, is it possible to consider that hydrogen is repelled,
and is then attracting the stars of the galaxy by gravitation?

Eventually, depending on the proportion of hydrogen, it could occur
that a galaxy repels another galaxy and does not attract it, or
attracts it less than expected.

--
Curiosus
http://www.geocities.com/curiosus_2008/

.

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