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None of the planets in the Solar system radiate their own light, so they are all as bright (luminous) as each other, which is, not at all.

Any light we see from planets is reflected light that came from the Sun (as opposed to stars who generate their own light).

the planet with the greatest apparent magnitude (that is, how bright the body appears to an observer on the earth looking up at the sky) is Venus.

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16y ago

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