Recent observations of the Sculptor Galaxy by NASA's Nuclear Spectroscopic Telescope ARray (NuSTAR), combined with those from NASA's Chandra X-ray Observatory, suggest that the supermassive black hole at the center of NGC 253 has dozed off, or gone inactive, sometime in the past decade. The NuSTAR data also reveals a flaring source of high-energy X-rays, called an ultraluminous X-ray source, or ULX. This object, which appears as a blue spot near the hotter, central region of the galaxy, is either a black hole or a dense, dead star, called a neutron star, feeding off a partner star. The flare is thought to be the result of a change in the object's feeding patterns. The other orange and reddish points are likely additional X-ray-generating pairs of stars located throughout the galaxy. // NASA/JPL-Caltech/JHU/ESO