A. rotation.
B. revolution.
C. gravitation.
D. orbit.
19. What scientist first proposed that the sun is the center of the solar system?
A. Copernicus
B. Ptolemy
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C. Kepler
D. Brahe
20. The unit light-year is a measure of
A. brightness.
B. distance.
C. time.
D. temperature.
do your own homework kid….
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