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January 31, 2015

January 31, 2015

Posted by **Mary** on Tuesday, February 19, 2008 at 1:24am.

- Science -
**drwls**, Tuesday, February 19, 2008 at 5:28amYou need to make the second star appear 9 times dimmer than it would at 100 l.y. distance. Since the received light is inversely proportional to the distance squared, that means you must triple the distance. That will put it 300 light years away.

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