Question

Name the brightest planet in night sky

Answer 1

Venus is the answer of the question

Answer 2

Venus is so bright because its thick clouds reflect most of the sunlight that reaches it (about 70%) back into space, and because it is the closest planet to Earth.

But I think you want the brightest star then your answer is :-

Sirius, also known as the Dog Star or Sirius A, is the brightest star in Earth's night sky. The name means "glowing" in Greek. 

#ninja