Exam-style question
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What implication does the existence of quasars have for our understanding of the universe?.
- A.They suggest the universe is static
- B.They indicate the universe is expanding
- C.They prove the universe is finite
- D.They show that galaxies do not evolve
Model answer
What a good answer should say
- They indicate the universe is expanding
Explanation
Why this works
The existence of quasars, particularly their high redshift, implies that the universe is expanding. This observation aligns with Hubble's law, which states that distant galaxies are receding from us.
Consequently, quasars serve as evidence for the dynamic nature of the universe, reinforcing the theory of cosmic expansion.
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