  Relativistic aberration influences apparent luminosities of objects moving
with relativistic relative velocities. The superluminosity or dimming of
incoming or receding jets ejected from Active Galactic Nuclei is believed to be
the manifestation of the effect. Redshifted cosmological objects, such as
high-z galaxies and supernovae in high-z galaxies, are also subjected to
luminosity dimming due to relativistic aberration, although the correcting
terms encompassing spectral redshift and time dilation are used to scale the
observed magnitudes in the restframe template. The Universe's expansion results
in elongation of distances to the objects from the moment of emission to the
present time related to the z = 0 local space; this elongation is equal to the
apparent increase of the distance from the apparent size to the restframe
distance in the theory of special relativity due to the effect of relativistic
aberration. Contrary to the standard Big Bang model with stationary space, the
effect of relativistic aberration zeroes in the expending space model; if local
spaces and local objects expand together with the Universe, the luminosity
distances to high-redshifted objects appear to be smaller then in the Big Bang
model.
