- Mar 17, 2015
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From your link:
Then, they split these stars into two batches: one containing 369 stars that rotate every 20 to 30 days and one with 2,529 stars that scientists haven't been able to calculate a rotation period for. (The sun rotates every 24.5 days, but that spin likely wouldn't be detectable to alien astrophysicists using the same techniques humans have, so both of these groups of stars are important.)
"The researchers then analyzed both these groups of stars to understand their activity levels and how they compare with the sun. Stars with known rotation rates were on average much more active than our sun has been over the past 9,000 years — about five times more active.
About 1/7th of them more active than our sun.
I understand now the problem in clarity there. It's not a really clear wording.
They are saying that when they could measure at all the most key thing of all -- the rotation period -- then for those stars (all the stars of similar mass to the sun and similar composition and for which they could measure the most key thing, the rotation period), in that group our sun stands out as an exception for being unusually quiet (stable).
The group that matters: those stars they know ought to be just like our sun.
But our sun isn't acting like them.
(!)
It's an accurate summary they made (of course) to say:
"We were very surprised that most of the sun-like stars are so much more active than the sun," Alexander Shapiro, a physicist at the Max Planck Institute for Solar System Research in Germany and a co-author on the new research, said in a statement.
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