Yesterday Louis told us of a 17 year cycle for Sun spots. I found out, that sun spot activity is a very active area of research right now. Xavier Dumusque found the closest terrestrial type planet by filtering out other periods in the stars associated with exoplanets. I posted below his 2011 paper on sun-like spots, which among other things allowed him to discover the closest Earth like planet so far, in Alpha Centauri.
If anybody is interested in this project, go ahead.
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