Re: Article: 13 things that do not make sense
From: Ilja Schmelzer (q6867901_at_mailstore.fernuni-hagen.de)
Date: 03/22/05
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Date: Tue, 22 Mar 2005 09:05:07 +0100
"N:dlzc D:aol T:com (dlzc)"
> > 2 The horizon problem
> > OUR universe appears to be unfathomably uniform.
> The Universe is closed.
Thats not clear, it may be as well flat and infinite. But even if
it is closed, its radius is much greater than you need for this
explanation of the horizon problem:
> What appears "28 billion light years
> total distance" could easily be only 1 billion light years apart,
> or even be "wrapped around", and be the same structures on both
> sides of us.
> > 3 Ultra-energetic cosmic rays
> > FOR more than a decade, physicists in Japan...
> ...
> > As cosmic-ray particles travel through space,
> > they lose energy in collisions with the low-energy
> > photons that pervade the universe, such as those
> > of the cosmic microwave background radiation.
>
> Why? Are all cosmic rays charged? Light only interacts with
> charged particles, and then only in certain "energy bands".
AFAIR (I have heard about this problem from other sources)
those cosmic rays people talk about are charged.
> > Einstein's special theory of relativity dictates that
> > any cosmic rays reaching Earth from a source
> > outside our galaxy will have suffered so many
> > energy-shedding collisions that their maximum
> > possible energy is 5 × 10^19 electronvolts.
>
> The theory of special relativity says no such thing.
Of course, you have to add something else. In this case, you have
to add theories how these particles in rest (or with speed
reached in particle accelerators) interact with high energy
radiation. Based on this theory you can compute what
happens with high speed travelling particles interacting with
the background radiation.
Moreover, there is a second problem of the same type.
There is also a limit for radiation, but gamma rays that
exceed this limit. In this case we there is a reasonable
hypothesis about the source, which is far away.
Sorry for having lost the source.
Ilja
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