Answer :
Explanation:
The solar nebula hypothesis -
It is the hypothesis , which describes the formation of the solar system from the nebula cloud , which is composed of gas and dusts .
The belief is that , the sun , moon , planets and the asteroids are formed from the nebula , around 4.5 billion years ago .
Nebula - is basically an interstellar cloud of the dust and gases .
The main phenomena for the formation of a celestial boy is the gravity .
The gravity condenses the gas into a region of density .
The denser region began to grow and act as a seed to further build a full fledged planet or any celestial body .