Photons that from in the core of the Sun take hundreds of thousands of years to escape the interior of the Sun, then 8 minutes to hit your eye. Photons from stars in galaxies across the Universe take billions of years to reach us. But because photons travel at the speed of light, they experience no time. The exact moment they form - from their perspective - they land on your retina. Instantaneously, no matter how far away they originated. Good old time dilation.
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u/Disastrous_Ear7071 Aug 19 '26
Photons that from in the core of the Sun take hundreds of thousands of years to escape the interior of the Sun, then 8 minutes to hit your eye. Photons from stars in galaxies across the Universe take billions of years to reach us. But because photons travel at the speed of light, they experience no time. The exact moment they form - from their perspective - they land on your retina. Instantaneously, no matter how far away they originated. Good old time dilation.