____________ are Kuiper belt objects that are in a 3:2 resonance orbit with the orbit of Neptune
a. Plutinos
b. Charons
c. Protons
d. Lepton
e. Resonons
a
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Two planets travel in circular orbits about a star. The period of planet A is T, while that of planet B is 3T. What is the ratio of the orbital radii, 
A. 0.33 B. 0.19 C. 0.48 D. 0.69
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a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases
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