Question

what is bigbang theory​

Answer 1

See,

In simple language,big bang theory was an explosion which is believed to be reason for the creation of the universe

Answer 2

There was million of galaxies . That time there were black holes , sun , asteriod rock . some asteriod rocks combined and formed planets like earth , moon , Mars ,Jupiter . And then our galaxy started ,which is in milky way now.

Exception - About a billion years after the Big Bang, gravity caused these atoms to gather in huge clouds of gas, forming collections of stars known as galaxies. Gravity is the force that pulls any objects with mass towards one another -- the same force, for example, that causes a ball thrown in the air to fall to the earth.

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