... Sun sizzles in high-energy X-rays . ... X-rays stream off the sun in this image showing observations from by NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR, overlaid on a picture taken by NASA's Solar Dynamics Observatory (SDO). ... NASA s Nuclear Spectroscopic Telescope Array, or NuSTAR, has taken its first picture of the Sun, producing the most sensitive solar portrait ever taken in high-energy X-rays. ... Only registered members of Astronomy.com are allowed to comment on this article. ...