Eli5: Why don’t we go blind staring at distant stars in the night sky, unlike staring at our own sun?

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I’m guessing it’s the apparent magnitude? Can you explain like I’m five absolute magnitude vs apparent magnitude, flux and other related concepts in simple terms?

To add further, do we know how far from our own sun would you have to be so that it’s not blinding?

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Anonymous 0 Comments

This isn’t really a question about light, it is a question about geometry.

Stars emit a certain amount of light in every direction. You can model the amount of light as being spread out over the surface of a sphere with a radius of your distance from the star. The surface area of a sphere can be calculated by multiplying 4 times pi times the radius squared.

As the radius increases so does the surface area of the sphere. The same amount of light then is spread out over a larger area, meaning the light in a given area reduces.

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