Video of the Sun

You can see the Sun rotating with plumes arcing up into the sky.

Just in case you need a reminder, NASA's STEREO mission is a set of twin solar observing spacecraft. One is leading the Earth in our orbit around the Sun, and the other is trailing behind us. Because of their different points in space, they'll be able to create a 3-dimensional view of events on the Sun's surface - just in the same way your eyes give you depth perception. They launched in October, 2006 on board a Delta II rocket.

One of the best uses of this binocular vision will be to trace the path of coronal mass ejections; especially the ones headed towards Earth. With STEREO, astronomers will be able to know right away if a CME is headed our way, and can help power companies and satellite operators prepare for some rough space weather. And they'll be able to give us a better idea of when to head outside and see an aurora.