If the Hipparcos satellite measures the parallax motion of a star against the background stars and concludes that the star has a parallax of 0.004 arcsec,how far is the star from Earth?
A) 25 pc, or 81.5 ly
B) 250 pc, or 815 ly
C) 400 pc, or 1300 ly
D) 0.004 pc, or 0.013 ly
Correct Answer:
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