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
d
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