Exam-style question
Try this first
Galaxy rotation: Pick the inference from unexpectedly high outer-star speeds. This tests Estimate the age of the Universe from Hubble constant values. in Hubble's law.
- A.Galaxy rotation answer: The rotation evidence suggests unseen mass such as dark matter.
- B.Galaxy rotation distractor: It proves all galaxies are nearby.
- C.Galaxy rotation misconception: It is caused by eyepiece magnification.
- D.Galaxy rotation off-scope: It removes the need for spectra.
Model answer
What a good answer should say
- The correct option is Galaxy rotation answer: The rotation evidence suggests unseen mass such as dark matter.
Explanation
Why this works
It is correct because it applies Hubble's law evidence to Estimate the age of the Universe from Hubble constant values.. The other options are incorrect because they swap in a different astrophysics measurement, telescope property or cosmology idea.
Common mistake
No common mistake is linked to this question yet.