The path in which one object travels around another object in space is called its?

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

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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