NASA's Solar Dynamics Observatory (SDO) has been studying the Earth-facing side of the sun and its eruptions for the last five years. The SDO, a semi-autonomous spacecraft, was launched into orbit on February 11, 2010. It took an image of the sun nearly once a second and built a mesmerizing record of solar activity.
According to NASA, "The imagery allows the viewer to watch the constant ballet of solar material through the sun's atmosphere, the corona. Five years into its mission, SDO continues to send back tantalizing imagery to incite scientists' curiosity".