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Our Best Measurements from Earth Indicate That the Star System

Question 77

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Our best measurements from Earth indicate that the star system Alpha Centauri is 4.2 lightyears away.Suppose some of our astronauts traveled there at a speed v = 0.80c.What would the astronauts measure as the distance to Alpha Centauri?


A) 3.1 lightyears
B) 7.0 lightyears
C) 8.8 lightyears
D) 2.5 lightyears
E) ​2.7 lightyears

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