Astronomy college course/Kepler/Quiz01/10

< Astronomy college course < Kepler < Quiz01

It would be better if we knew which two rather than just two of them in general. For example the choices could be A. B. C. A&B. B&C. W073cjw (discuss • contribs)


If we are not given the answer, we can't learn from this question. -Xlynn89x

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