A good look at the entire sky reveals some interesting irregularities in the Cosmic Microwave Background. For instance, the temperature of the Cosmic Microwave Background is very slightly higher on one half of the sky (toward the constellation Leo) than on the other half (toward Aquarius). This is the result of a Doppler shift. The Microwave Anisotropy Probe is moving around the Sun; the Sun is orbiting the center of our galaxy; our galaxy is falling toward the Andromeda Galaxy; the Local Group (containing both our galaxy and the Andromeda Galaxy) is being pulled toward the Virgo Cluster; the Local Supercluster (containing both the Local Group and the Virgo Cluster) is being tugged toward the Hydra-Centaurus Supercluster. As a net result of all these motions, the Microwave Anisotropy probe is moving in the direction of Leo at a few hundred kilometers per second. The microwaves coming from the direction of Leo are slightly blueshifted to higher temperatures; the microwaves coming from the opposite direction are slightly redshifted to lower temperatures.
Er mogen dan wel geen geprefereerde referentiekaders zijn, maar op die manier zou je toch een soort van 'stilstand' kunnen definieren. Grappig!
: Oh, en hier is de link trouwens nog: http://www-astronomy..._9/notes39.html