Geography, 04.04.2020 04:15, queentynaisa
Let's say you want to see if another star goes through a starspot cycle like our Sun goes through a sunspot cycle. To be sure it is cyclic activity, you should watch the star for two cycles. If the other star's cycles last as long as our Sun's sunspot cycle, how long should you study the star?
about 22 years
Answers: 2
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