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.
mercury
Venus is the brightest and hottest Planet in our solar System.
Venus is the brightest thing in the sky, after the Sun and Moon.
The planet Venus is!
venus
The earth isn't the brightest planet,it is Venus.
The second Brightest planet is Jupiter.
mercury
Venus
Venus is the brightest and hottest Planet in our solar System.
Jupiter is the second brightest planet in the sky after Venus and the fourth brightest object in the sky. The sun and the moon are the brightest objects in the sky, but they are not planets.
Venus is the brightest thing in the sky, after the Sun and Moon.
The planet Venus is!
The planet Venus is!
venus
venus
Jupiter is...