Light travels at a finite speed, meaning that when we observe celestial objects, we are seeing them as they were in the past rather than as they are now; for example, stars visible to the naked eye may have already died or exploded thousands of years ago, and we are only now receiving their final light signals.
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The Sky Is a Graveyard of Light本站添加:
Every star you have ever wished on might already be a corpse.
Light does not arrive instantly. It crawls across space for hundreds, sometimes thousands of years before it touches your eyes.
That bright point above you tonight could have exploded before humans learned to write, and you are only now receiving its final message.
You are literally watching the past burn. [music] The sky is not a window. It is a graveyard of light, >> [music] >> and every night you stare into it without knowing what is already gone.
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