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The Earth's Orbit Has a Mean Radius of 1

Question 29

Multiple Choice

The Earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How distant is the star, in ly? (1 ly = 9.46 × 1015 m)


A) 0.13 ly
B) 1.3 ly
C) 13 ly
D) 130 ly
E) 1300 ly

Correct Answer:

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