Eli5. How its possible for the light to travel constantly with out stop slowing down from the most old galaxies?
In: Physics
Normal light spreads out and its intensity decrease as it covers more distance until it fades away.
It is possible for powerful laser lights. Laser lights have single beam of light ray. So, there is very little spread and decrease in its intensity with increasing distance.
But powerful laser light rays also spread to some extent causing decrease in its intensity until it fades away at largest distance.
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