Popular Science -
26 Nov 2012 21:00

How do we know the sun is moving into the most active part of its 11-year cycle? For starters, we can plainly see it. Every time the sun lashes out with another beautiful but potentially threatening solar flare or coronal mass ejection, we are reminded that the naturally occurring solar cycle is approaching a “solar maximum†in 2013 and that solar activity is on the ascent. But what does that mean? If you’re having a hard time picturing an active ball of flaming nuclear fusion...
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