How big is the sun’s atmosphere? In a word: huge. Like Earth, the sun’s atmosphere consists of multiple layers. It has a lower atmosphere, called the chromosphere, and a significantly larger upper atmosphere, called the corona. Although the exact boundaries of these regions are fuzzy, the outer limit of the corona is marked by the place where the sun’s solar wind breaks free. Using NASA’s STEREO spacecraft, scientists have found the extent of the corona is greater than previously thought, stretching some five million miles from the surface. The distance is equivalent to approximately six times the sun's length. Knowing this information will help guide the planning of future sun-observing missions. Watch the video to see solar material streaming from the sun.
Please give credit for this item to: NASA's Goddard Space Flight Center Cover image courtesy of NASA/STEREO Video courtesy of ESA/NASA/SOHO/Alzate Sun images courtesy of ESA/NASA/SOHO
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