Yesterday NASA marked a historic milestone after releasing images of the Sun’s front and back. These views are the result of observations by NASA’s two Solar TErrestrial Relations Observatory (STEREO) spacecraft. The duo are on diametrically opposite sides of the sun, 180 degrees apart. One is ahead of Earth in its orbit, the other trailing behind. This gives us humankind our first ever global look at the whole sphere of our Sun’s surface and atmosphere. For the first time in history we can see the entire Sun at one time – both the far side and the near side.