Is light eternal? If the oldest light we can see comes from a 13.4 billion-year-old Galaxy, does that imply that light never dies? Does it just bounce around for infinity?
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It is a commonly held scientific belief that light is eternal. The oldest light we can observe is known as the cosmic microwave background radiation, which is thought to have been emitted around 380,000 years after the Big Bang, which occurred around 13.8 billion years ago. This light has been traveling through the universe ever since, and will continue to do so for an infinite amount of time. While light may lose energy through processes such as redshift, it does not "die" in the traditional sense. Instead, it simply continues on its journey through the vast expanse of the universe.

