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Planets don't produce their own light, it is only reflected light from the Sun. The light from the Sun is exactly the same type of light that comes from all other stars, it is stronger only because the Sun is closer to us.

Brightness is measured in magnitudes, the bright stars are magnitudes 0 and 1 and there are even two stars with a negative magnitude. The dimmest stars visible in perfect conditions are 6th magnitude. The Sun's magnitude is -26.7.

If the distance goes up 10 times, the brightness goes down 100 times, which is exactly 5 magnitudes.

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12y ago

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