** Doppler effect and Cosmology / Red-shift.
=======
The Doppler effect (or the Doppler shift)* an increase (or decrease) in the frequency of sound,
light, or other waves as the source and observer move toward (or away from) each other.
* ** /today's knowledge /
=========
a)* all galaxies ( . . . . etc )* exist in an infinite vacuum.
* *If a tree falls in the vacuum, it doesn't make a sound, none*would hear this.
This is because sound waves can't travel through an '' empty''* vacuum.
b)* in* the vacuum,* photon with constant speed* c* has no wavelength.
Photon travels with constant speed* c** is a pure particle, without wavelength.
This pure particle travels in a straight line until it will meet big gravity-masses.
It means, that
* it* is impossible to use Doppler effect to understand* Cosmology and* Red-shift.
===========================
=======
The Doppler effect (or the Doppler shift)* an increase (or decrease) in the frequency of sound,
light, or other waves as the source and observer move toward (or away from) each other.
* ** /today's knowledge /
=========
a)* all galaxies ( . . . . etc )* exist in an infinite vacuum.
* *If a tree falls in the vacuum, it doesn't make a sound, none*would hear this.
This is because sound waves can't travel through an '' empty''* vacuum.
b)* in* the vacuum,* photon with constant speed* c* has no wavelength.
Photon travels with constant speed* c** is a pure particle, without wavelength.
This pure particle travels in a straight line until it will meet big gravity-masses.
It means, that
* it* is impossible to use Doppler effect to understand* Cosmology and* Red-shift.
===========================