Light from the Moon takes about 1.3 seconds to reach us. From the Sun, 8 minutes. From Proxima Centauri, our nearest stellar neighbour, over 4 years. From the Andromeda Galaxy — the farthest object visible to the naked eye — 2.5 million years.
Every time you look at the night sky you are looking backwards in time. The photons hitting your retina left their source before you were born, before civilisation existed, before our species walked the Earth. The universe is not just large — it is incomprehensibly old.
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