Historian: Our Sun is our ultimate source of energy. Its health effects all life on Earth. When our Sun belches a bunch of its coronal mass (a coronal mass ejection CME) as we see in the image above, this can cause disturbances in, and even fry, much of our electric infrastructure. So, it is a good idea for us to keep a close watch.
Physicist: STEREO (Solar and Terrestrial Relations Observatory), one of NASA's missions watching our Sun, is celebrating a tenth anniversary by giving us some nice videos which we link to below. We also take this opportunity to link to related NASA sites. There is much to explore via all these links.
STEREO 10th anniversary video [link]
How to read STEREO images [link]
NASA STEREO mission home [link]
NASA Sun home [link]
Science at NASA STEREO home [link]
Science at NASA Sun home [link]
STEREO images in stereo [link]