Trying to spot differences in the sun

The sun is the focus of a deepening mystery. Solar scientists want to know: Why is the sun so quiet?

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<p><a href="http://www.physorg.com/news165402599.html">Trying to spot differences in the sun</a></p> <p>The sun is the focus of a deepening mystery. Solar scientists want to know: Why is the sun so quiet?</p>