Massive Sunspot Rapidly FormingSubmitted by emalvini on Thu, 02/21/2013 - 11:33
Feb 20, 2013 | NASA
A giant sunspot that's at least six times the diameter of Earth has formed on the sun in less than 48 hours, according to NASA. Sunspots form when the sun's magnetic fields rearrange and realign. They tend to be unstable and can lead to solar flares.