the Galaxy theory the Big Bang theory the Steady State theory the Oscillating theory
I gave my students this multiple choice question: Which theory about the origin of the universe states that a densely packed sphere exploded, forming clouds that condensed into galaxies?

Only one answer is correct among these 4 choices:
- the Galaxy theory
- the Big Bang theory
- the Steady State theory
- the Oscillating theory

Could you tell me which one is correct?

the Big Bang theory