automodtedtrr2939 t1_ja6tdv9 wrote on February 27, 2023 at 7:08 AM Reply to Eli5: how old is a photon from the sun when it arrives to the earth? by Opposite-Shoulder260 Zero seconds. The closer you get to light speed, the slower you perceive time. Once you hit light speed, time stops for you. A trip to the opposite side of the universe would be an instant to a photon, but billions of years to an outside observer. Permalink 2
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automodtedtrr2939 t1_ja6tdv9 wrote
Reply to Eli5: how old is a photon from the sun when it arrives to the earth? by Opposite-Shoulder260
Zero seconds.
The closer you get to light speed, the slower you perceive time. Once you hit light speed, time stops for you.
A trip to the opposite side of the universe would be an instant to a photon, but billions of years to an outside observer.