with how light works and the constant expansion of what we term the “observable universe” why don’t we constantly see new stars appearing in the night sky as the observable part expands and stars/galaxies light reaches us for the first time?
The night sky has stayed relatively the same (accounting for changing postions over time, stella phenom, supernovas etc.) for all of humans written history.
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Inverse-square law.
ELI5: Imagine a ball made of light. There is a certain amount of light on the outer surface of that ball. If the ball grows and gets twice as big, the light spreads out in two directions. Instead of half as much light in a given area, there is one-quarter as much light.
As you get further away, the amount of light you could see drops off very, very quickly. Ten times further away means 1/100th the light. Stars are very bright but very far away. We only see the closest and brightest stars in the night sky.
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