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Answer:
The unit of measure which should be used to describe the size of the galactic body mentioned in the question is
Astronomical Units.
Explanation:
Trying to measure the size of planets in Kilometers and Miles is futile as the numbers are too enormous.
Astrologists have invented metrics which keep it simple and one Astronomical Unit is equal to 149,597,871 kilometers (92,955 miles).
Cheers
Sign language is your answer i think
I believe the answer is: Predict the outcomes of experiments before they are told the actual results.
By making them predicting the outcome of the experiment, dr. donelian would expose them with the fact that their prediction would often be wrong. After experiencing this, the students would no longer see the experiment as 'documenting the obvious'