_____________ is called Amavasya.

_________ takes the longest time.

The ____________ also move around the sun.

Millions of stars together form a group is called _____________.

Large systems of stars in outer space called ___________.

The ____________ is the largest and the brightest thing in the night sky.

The vast space containing all the celestial bodies is called __________.

___________ are among the most beautiful sights in the solar system.

____________ is a unique planet of the solar system.

Where did life originate first ?