Answer:
The Big Bang theory is what we supposed how our universe began. When it exploded, things started to form like, stars, planets, debris, and floating rocky things in space that we know today, as asteroids.
The Big Bang theory is a theory on how the universe came into existence. The idea is that the universe started from no immaterial things but from a one point, (Basically they are saying the universe started from nothing).
There has been experiments done saying that it will keep growing larger and larger day by day.
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