7
practice examMultiple Choice

Practice Exam

Question 7 • Physics in the Universe

What would happen if gravity did not pull dust and gas together after the Big Bang?

Answer
A
Stars and galaxies would never form.
B
Heavier elements like carbon and oxygen would form earlier.
C
The cosmic microwave background would disappear.
D
The universe would collapse back into a singularity.

Explanation

Gravity pulls clouds of gas and dust together, allowing them to become dense enough to form stars and galaxies. Without that pull, the material would remain spread out, so stars and galaxies would never form. Heavier elements such as carbon and oxygen are made mainly inside stars, so they would not form earlier.

AI-written and checked against the verified answer.

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