this post was submitted on 11 Aug 2023
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Explain Like I'm Five | Don't Panic!
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Simply put, it's the distance light travels in a year. We see the sun as it was 8 minutes ago, because the sun is 8 light minutes away from earth.
To answer your other question: Yes, someone more than 65 million light years away from earth would be able to see dinosaurs if they had a telescope powerful enough to see something that far away with that much clarity. Such a telescope does not exist as far as humans on earth are aware.