The moon is the closest heavenly body to the earth and because of its relatively high albedo it reflects a lot of the light falling on it hence it is the brightest object in the night sky. Similar reasons also apply to Venus, which is also a very bright object.
brightest
Blue-white stars are the hottest and brightest stars; Sirius A (and its white dwarf companion Sirius B) is the brightest star in Earth's night sky.
Venus
Jupiter.
I think you're talking about Venus After the Moon, it is the brightest natural object in the night sky.
The brightest object in space, aside from the Sun and Moon, is the star Sirius. Sirius is the brightest star in the night sky and is located in the constellation Canis Major. It appears exceptionally bright due to its proximity to Earth and its high luminosity.
Venus is the brightest natural object in the night sky after the moon. Its thick clouds reflect sunlight very well, making it appear very bright and visible to the naked eye.
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.
Even on Jupiter, or in the vicinity of Jupiter, the sun is still the brightest object in the sky. The brightest planet would be Saturn.
Sirius is the brightest star in the night sky, but the brightest overall is the sun.
The sun appears the brightest in the sky because it is the closest star to Earth, approximately 93 million miles away. Its proximity combined with its luminosity makes it the brightest object in our sky.