One of the most important confirmation of the Big Bang theory was the discovery of the time broadening of the light curve of the far supernovas (supernovas 1A, standard candles, at the distances around Z=1). From straightforward consideration in the complete absence of light scattering it can not be explained in any other way but by Doppler-like effect which in this case called time dilation and seemingly confirming the Big Bang. However, the hypothesis of tired light [1] also allows the light being diffusion-like scattered on travel from supernova thus allowing change in distance traveled and allowing corresponding time broadening of the light curve (the fastest photons goes straight path, later arrived those which due to multiple scattering — diffusion-like in perpendicular direction — first traveled away from direct line, than returned back, possible many times and thus got a big enough increase in distance to generate perceptible — few days- delays at arrival). Problem with this mechanism is that gives smaller time delays compare to time dilation directly observed [1]. The gravitational microlensing may be involved and due to additional change of distance, Shapiro effect and brightening some parts of the image of supernova (3 separate effects) will make the light curves broader and thus explaining the time dilation observed.