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The Hipparcos Satellite Was Able to Measure Parallax for Stars

Question 184

Multiple Choice

The Hipparcos satellite was able to measure parallax for stars out to about 150 pc. This distance includes roughly 2.5 million stars. What is the average number of stars in 1 cubic parsec?


A) 5.1 × 10-3
B) 0.18
C) 5.65
D) 8.84

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