Internet is my friend.
Collect the information from internet about Big-bang theory related with formation of stars and planets and present it in your class.

Explanation

i. It is presumed that, about 15,000 million years ago, the universe came into existence with a single titanic explosion called as Big Bang.
ii. Due ot this all the matter and tremedous energy came into existence.
iii. The fragments of the fire ball expended and cooled to give rise to many celestial bodies.
iv. The majorilty of atoms produced by the BIng Bang were hydrogen, along with helium and traces of lithium. Gaint clouds of these primordial elements later merged through gravity, till they became denser and hotter. In due course of time this resulted information of stars and planets.