Proxima Centauri, the closest star to the sun, is at a distance of about a. 4 light-years

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Proxima Centauri, the closest star to the sun, is at a distance of about
a. 4 light-years
b. 400 light-years 

c. 4 million light-years
d. 4 billion light-years

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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