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OpenStudy (anonymous):
Star 2 is 52 light years from Earth and 18 light years from Star 1. If Star 1 explodes as a supernova, in how many years would the explosion be seen from Earth? 18 34 52 70 It had a picture, of Earth, then Star one, and star two.
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OpenStudy (anonymous):
|dw:1341619473999:dw| More info needed
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