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NASA's Solar Dynamics Observatory captured this image of an M6.5 class flare at 316 EDT on April 11, 2013. This image shows a combination of light in wavelengths of 131 and 171 Angstroms. The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields. The Sun is classified as a G-type main-sequence star (G2V) based on spectral class and it is informally designated as a yellow dwarf because its visible radiation is most intense in the yellow-green portion of the spectrum, and although it is actually white in color, from the surface of the Earth it may appear yellow because of atmospheric scattering of blue light. A coronal mass ejection (CME) is a massive burst of solar wind and magnetic fields rising above the solar corona or being released into space. Coronal mass ejections are often associated with other forms of solar activity, most notably solar flares, but a causal relationship has not been establi...