Exam-style question
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What is the significance of observing high redshift in quasars?.
- A.It suggests they are ancient objects.
- B.It indicates they are part of our solar system.
- C.It shows they are moving towards us.
- D.It means they are not affected by cosmic expansion.
Model answer
What a good answer should say
- It suggests they are ancient objects.
Explanation
Why this works
The cause of observing high redshift in quasars is their significant distance from Earth, which is a result of the universe's expansion. This mechanism indicates that the light we see from them has traveled for billions of years.
The effect is that we are observing them as they were in the past, leading to the consequence that they are considered ancient objects in the context of cosmic history.
Common mistake
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