NGC 3521 is a flocculent (patchy-armed) spiral galaxy located in the constellation Leo, approximately 26–40 million light‑years from Earth. It spans about 50,000 light‑years and is viewed nearly face‑on. The galaxy features a soft, “woolly” appearance due to its discontinuous spiral arms, with regions of active star formation spread throughout.
Source: science.nasa.gov
13/01/2011

Gorgeous spiral galaxy NGC 3521 is a mere 35 million light-years distant, toward the constellation Leo. Spanning some 50,000 light-years, its central region is shown in this dramatic image, constructed from data drawn from the Hubble Legacy Archive. The close-up view highlights this galaxy's characteristic multiple, patchy, irregular spiral arms laced with dust and clusters of young, blue stars. In contrast, many other spirals exhibit grand, sweeping arms. A relatively bright galaxy in planet Earth's sky, NGC 3521 is easily visible in small telescopes, but often overlooked by amateur imagers in favor of other Leo spiral galaxies, like M66 and M65.