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The Sun, A full-disk multiwavelength extreme ultraviolet image of the sun taken by SDO
2010, 30 March
SDO - Solar Dynamics Observatory
False colors trace different gas temperatures. Reds are relatively cool (about 60,000 Kelvin, or 107,540 F); blues and greens are hotter (greater than 1 million Kelvin, or 1,799,540 F).
AIA = Atmospheric Imaging Assembly