Solar cycle primer
Friday, October 28, 2011 - 14:01
in Astronomy & Space
(PhysOrg.com) -- Telescopes spotted the first blemish on the sun in 1611. While the sun had long been thoughtat least in the Western worldto be an unchanging, "perfect" orb, sky-watchers observed black sunspots on the sun's surface that circled around as with the sun's rotation.