Red Is In

Well Double-A prompted me to go with this posts(thoughts of) Double-A
the universe is expanding,at an accelerating rate and you can add that
to these other reasons for the color red. Let me start with a very hot
star our eyes pick up its intensity as blue" and a cool star as "red,but
here is the reality the hot star is radiating more in the red part of
the spectrum than is a cool star that appears red.Hmmm I could almost
end this post with that information. Just about all galaxies are
moving away from us,and that means longer wave lengths and that means
more red photons. Another reason for red is dust. For us to view
another galaxy we must look through the dust of our galaxy. This reddens
the light. Seems to me the composition,and structure of dust
particles must show themselves in the red spectrum(good reasons for
this) Most galaxies are very far from us,and as their recessional
velocity gets greater with increase distance they appear "highly red
shifted" I think I red(not sure) that more luminous
galaxies are redder because they contain more metals. We know that star
formation has slowed down that means more old stars in this spacetime
than new ones Stars redden as they age. Well I( seemed to run out of
thoughts on reddening. So let me leave asking this question. Can the
inverse square law that photons obey result over spacetime more red
photons? Bert

photons?

Certainly,
Or preferably mine.

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A
HREF="http://journals.aol.com/virginiaz/DreamingofLeonardo"http://journal
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photons?

Certainly,
Or preferably mine.

I'll be Graviton
If you wish!

_______
Blog, or dog? Who knows. But if you see my lost pup, please ping me!
A
HREF="http://journals.aol.com/virginiaz/DreamingofLeonardo"http://journal
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Well I'm looking at my red sun glasses,and the reason they are red is
only red light can go through the glass. What if space has this same
feature??? Bert

In ,
G=EMC^2 Glazier typed:
Well I'm looking at my red sun glasses,and the reason they are red is
only red light can go through the glass. What if space has this same
feature??? Bert

You already know this, but a little reminder:
Red shifting is not the same as red filtering.

Hope Moby is well. I played with one of his wild cousins a few years back,
we had fun.

Jo

Hi Jo Just wanted to list the many ways light can go to red. Moby is
doing well. He knows how to keep time,and if I'm late with his Epswich
clams he gets very festy. Likes to be lifted up and down out of the
water(dunked),and won't let go of my fingers. Have to keep his tank
under the air-conditioner for he likes cold water,and hate's the sun.
Bert

(G=EMC^2 Glazier) wrote in message ...
Well I'm looking at my red sun glasses,and the reason they are red is
only red light can go through the glass. What if space has this same
feature??? Bert


That's an interesting thought, but I believe they can tell by the
shifting of spectral lines for elements such as hydrogen in the light
that it has been Doppler shifted and not merely filtered through red
space dust.

Double-A

Double-A wrote:

(G=EMC^2 Glazier) wrote in message ...
Well I'm looking at my red sun glasses,and the reason they are red is
only red light can go through the glass. What if space has this same
feature??? Bert

That's an interesting thought, but I believe they can tell by the
shifting of spectral lines for elements such as hydrogen in the light
that it has been Doppler shifted and not merely filtered through red
space dust.

Certainly, and the Doppler shift of each component could likely be identified.

Suppose we're looking at a star that's receding from us: the bright
emission lines from excited atoms in its atmosphere will appear at
slightly lower frequencies than in a standard spectrum, all of them
by the same amount. Now suppose that the star had gone through an
episode of coughing up red dust -- however unlikely that may be -- in
an expanding cloud whose trailing edge (that we have to look through
to see the star) is actually approaching us. We must be calling the
dust "red" because it absorbs a lot of blue and green light, showing
a spectrum with dark bands in those regions, so we'd only be able to
see the emission lines in the red area, or elsewhere between gaps in
the pattern. But this "reddening" is quite independent of the
red-shift in the bright spectrum. Anyway, assuming that we can
identify the 'signature' of the absorbing material, we'll see the
dark bands at slightly *higher* frequencies than normal. From this we
could deduce that the dust is approaching us while the star is receding.

This may be a rather silly example, but the principle that different
sets of spectral features can show different red- or blue-shifts is
important in the study of close binary systems, stars with turbulent
atmospheres, planetary nebulae (& other kinds), star-systems
containing disks or vortices of gas, and other situations where
various different types of material are in motion.

--
Odysseus

and other situations where
various different types of material are in motion.

Odysseus

Hail, is
This The Red Garter,
Downtown drag scene?
Place de Salad Daze?

_______
Blog, or dog? Who knows. But if you see my lost pup, please ping me!
A
HREF="http://journals.aol.com/virginiaz/DreamingofLeonardo"http://journal
s.aol.com/virginiaz/DreamingofLeonardo/A

Hi Odysseus Not a silly example,but a very nice example(I like it) it
shows good thinking. We know why our sunsets are red,and why the Earth
looks like a blue marble from these thoughts. Bert