Which theory was propounded by Immanuel Kant and Laplace ?

Millions of stars together form a group is called _____________.

___________ are celestial bodies which produce their own heat and light.

____________ is a unique planet of the solar system.

How many planets are in our solar system?

____________ rotates the fastest.

Large systems of stars in outer space called ___________.

___________ are called shooting stars.

Inner planets are also called as?