You observe Neptune as it occults a background star when the relative velocity between Neptune and the Earth is 30 km/s,and the star crosses through the middle of the planet and disappears for 27.6 minutes.What is Neptune's diameter?
A) 5 × 104 km
B) 800 km
C) 4,000 km
D) 9 × 103 km
Correct Answer:
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