Redshift would define that stars are moving away from us, this freaks me out. Why doesn't anyone say it is the gravity field of our solar system that is expanding over time, and that is what stretches the incommoning lightwaves, causing the redshift effect. A gravity field made up out of emitted gravity particles (8), that move at a constant speed, would expand exponential (x^2) because it originates from a round object (sun), these particles that move away from us cause the Doppler effect. The light shifts happens due to solar gravitation, in the same way that Einstein predicted that starlight is bent by the sun (ref.).
In physics (especially astrophysics), redshift happens when light seen coming from an object is proportionally shifted to appear more red. Here, the term "redder" refers to what happens when visible light is shifted toward the red end of the visible spectrum. More generally, where an observer detects electromagnetic radiation outside the visible spectrum, "redder" amounts to a technical shorthand for "increase in electromagnetic wavelength" — which also implies lower frequency and photon energy in accord with, respectively, the wave and quantum theories of light.
Redshifts are attributable to the Doppler effect, familiar in the changes in the apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles; an observed redshift due to the Doppler effect occurs whenever a light source moves away from an observer.
I have highlighted the part of the Doppler effect, because a similar 'shift' would happen if you make a sound in the direction of a fan, the harder the fan blows towards the origin of the sound, the further away the speaker appears to be. In a similar way; if the gravity field of our solar system expands over time, than the further away other galaxies seem to be.
On the moon, a combination of gravity and super low atmospheric pressure/density that makes astronouts light on their feet. In the same way an expanding gravity field creates a more dense heliosphere, and like someone posted on a forum (ref.):
Everything we measure is governed by the speed of light...Its a mistake to make that a constant ... It works in envoronment..but the speed of light is constant in a vaccuum....As it passes through any mass it will slow. If it is very far away then it will pass through a lot of mass. hence the time it takes to reach us ... This I think but cannot prove "yet" will effect the Dopler effect ... I can prove however that the further any spectrum of light has to travel then the more it will be slowed by mass.
Also have a look at, Pioneer Anomaly :
The Pioneer anomaly or Pioneer effect is the observed deviation from predicted trajectories and velocities of various unmanned spacecraft visiting the outer solar system, most notably Pioneer 10 and Pioneer 11. Both Pioneer spacecraft are escaping from the solar system, and are slowing down under the influence of the Sun's gravity. Upon very close examination, however, they are slowing down slightly more than expected. The effect can be modeled as a slight additional acceleration towards the Sun. The anomaly has no universally accepted explanation. The explanation may be mundane, such as measurement error, thrust from gas leakage or uneven radiation of heat. However, it is also possible that current physical theory does not correctly explain the behaviour of the craft relative to the sun. (http://en.wikipedia.org/wiki/Pioneer_anomaly)
A thought experiment: Imagine yourself having a pair of glasses that are constantly collecting dust, and every morning when you put on your glasses, you say: "Hey, the world is getting darker!". Well it might be the same for those who like to think that the stars are moving away from us.