everything you see is old

Recently I was talking with a professor about the fact that the light we can see from the stars is also a look back in the past. Light travels with approximately 300.000 km/s, for example it takes an average of 8 minutes and 20 seconds for the sunlight to reach earth.

Imagine a pen with a length of 15 cm. How much older is the end facing away from you than the one pointing at you? It is 0.0000000000500346143 seconds older… fascinating… Every image you perceive is also a look in the past.