How many Moons does Uranus have?

  The layer of the sun below corona is called, 

Which is the smallest planet in Solar System?

How many Moons does Neptune have?

  Olympus Mons is a mountain on which  planet ? 

 Which of these atoms are mainly seen in stars?

Which of these constellation include seven bright stars, known as Vrischika in Indian Astronomy?

  Which constellation has the  image of hunter holding a shield in his left hand and a raised club in the right hand?

 Which is the third largest constellation?

  How many earth's days will Mercury takes to revolve around the sun?