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Brightness of an object

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How much dimmer does the sun appear from Neptune than from Earth? The average distance between a planet and the sun equals the semimajor axis of the planet's orbit. I think you need to calculate a ratio, but I'm not sure.

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Brightness of an object, the sun, is discussed.

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Hello and thank you for posting your question to Brainmass.

Brightness of an object (I) is inversely proportional to the square of the distance from that object.

That is:

I = A/(r^2)

Where A is some constant.

Let Ie be the brightness of the sun as seen from earth ...

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