14
practice examMultiple Choice

Practice Exam

Question 14 • Physics in the Universe

Which best describes the present-day universe?

Answer
A
opaque, expanding very slowly, stars produce heavy elements
B
opaque, expanding at an accelerated rate, stars produce only hydrogen and helium
C
transparent, expanding at an accelerated rate, stars produce heavy elements
D
transparent, expanding very slowly, stars produce only hydrogen and helium

Explanation

The present-day universe is transparent because light can travel freely through space. Its expansion is accelerating, and stars create elements heavier than hydrogen and helium through nuclear fusion and stellar processes. Therefore, “transparent, expanding at an accelerated rate, stars produce heavy elements” is the best description.

AI-written and checked against the verified answer.

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