NASA’s NuSTAR (Nuclear Spectroscpic Telescope Array) generally observes at black holes and other distant objects in the solar system. However, this time, the telescope has captured an image of the sun’s high-energy X-ray flashes.
Active Region 2242, an extremely active part of the sun, let out a huge solar flare late on Friday afternoon after days of intense solar storms. This is the most sensitive image ever of the star taken by NASA. Two smaller, but still powerful solar flares from the same spot preceded this one.