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Scientist say the sun is expected to go into a dimmer, cooler cycle by 2050. What does this mean for planet earth? It’s what scientists have termed a “grand minimum” — a particularly low point in what is otherwise a steady 11-year cycle. Over this cycle, the sun’s tumultuous heart races and rests. At its high point, the nuclear fusion at the sun’s core forces more magnetic loops high into its boiling atmosphere — ejecting more ultraviolet radiation and generating sunspots and flares. When it’s quiet, the sun’s surface goes calm. It ejects less ultraviolet radiation. Now scientists have scoured the skies and history for evidence of an even greater cycle amid these cycles.