Eli5. How its possible for the light to travel constantly with out stop slowing down from the most old galaxies?
In: Physics
To disagree with nearly every other answer here.
Light doesn’t travel forever at the same speed, it does in fact slow down.
To support this is I cite the phenomenon known as cosmic background radiation.
That fuzz you can hear on an old TV or radio that isn’t tuned properly is an abundance of radio waves that we can detect.
These radio waves are actually the output from the big bang that had slowed down and lost energy over time. They used to be visible light or other higher energy radiation.
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