The Sun!!

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Sunspots

"Sunspots are caused by the Sun's magnetic field welling up to the photosphere, the Sun's visible "surface". The powerful magnetic fields around sunspots produce active regions on the Sun, which often lead to solar flares"
Cite: http://www.windows2universe.org/sun/atmosphere/sunspots.html

Watch this awesome video of a prominence erupting!

Giant Prominence Erupts - April 16, 2012

watch this video of a solar flare!

NASA | SDO Sees Two Solar Flares