Re: Triple AES (3AES) - OT: Universe Accelerating Expansion and RecentCosmological Discoveries
From: AE (nospam_at_hidden.com)
Date: 05/28/03
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Date: Wed, 28 May 2003 10:57:36 +0200
Lassi Hippeläinen wrote:
> AE wrote:
>
>>Phil Carmody wrote:
>>
>>>Red shift is proportional to (relative) velocity. (for v<<c)
>>>I don't think you should be assuming that distance and velocity are
>>>linearly related as a given in this situation.
>>>
>>>Phil
>>
>>Well - exactly that's the point that leaded to the theory of universe
>>starting in a Big Bang:
>>
>>The red shift measured can be explained by relative velocity being
>>proportional to distance.
>>
>>AE
>
>
> Some nitpicking: the _cosmological_ red shift isn't due to movement of
> galaxies; it is the result of the space (as a medium) expanding. The
> wavelength of a photon gets extended by the amount the medium has
> expanded after the photon started its journey.
>
> The red- or blueshifts within a galaxy are ordinary Doppler shifts.
>
> -- Lassi
Yes - that's the current interpretation of things. Indeed this inflation
of space is equivalent to real movement.
The red- or blueshifts within our galaxy are dominated by ordinary
Doppler shifts since the inflation of space over that a short distance
has little effect compared to the ordinary Doppler shift. Of course
inflation of space takes place as well on this scale.
On the other hand the movements within our galaxy are primarily due to
gravity, which is - according to our current theories - as well an
effect of geometry. So the movement of stars within our galaxy is as
well not an effect of "real movement" but of space warp :-)
AE
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