关于这张图
NASA's Solar Dynamics Observatory captured this image of a mid-level solar flare – as seen in the bright flash in the middle –on Dec. 16, 2014 shortly before midnight EST. Read more: <a href="http://1.usa.gov/1BYLxsE" rel="nofollow">1.usa.gov/1BYLxsE</a> Image Credit: NASA/Goddard/SDO <b><a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a></b> <b><a href="http://www.nasa.gov/centers/goddard/home/index.html" rel="nofollow">NASA Goddard Space Flight Center</a></b> enables NASA’s mission through four scientific endeavors: …
