The Earth's Orbit Has a Mean Radius Of $1.5 \times 10 ^ { 8 } \mathrm {~km}$

question 9

Multiple Choice

The earth's orbit has a mean radius of $1.5 \times 10 ^ { 8 } \mathrm {~km}$ . Over a six-month period, the apparent position of a particular star varies by $0.00014 ^ { \circ }$ due to parallax. How many light-years is this star from Earth? (1 ly $= 9.46 \times 10 ^ { 15 } \mathrm {~m}$ )

• A) \(130 \mathrm { ly }\)
• B) \(13 \mathrm { ly }\)
• C) \(0.13 \mathrm { ly }\)
• D) \(1.3 \mathrm { ly }\)

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