18
practice examMultiple Choice

Practice Exam

Question 18 • Earth and Space Science

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

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

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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