in the core of the larger spiral structure of ngc 1300, the nucleus shows a "grand-design" spiral structure that is about 3,300 light-years long. only galaxies with large-scale bars appear to have these grand-design inner disks — a spiral within a spiral. models suggest that the gas in a bar can be funneled inwards, and then spiral into the center through the grand-design disk, where it can potentially fuel a central supermassive black hole (smbh). ngc 1300 is not known to have an active nucleus, indicating that its central black hole is not accreting matter. the smbh has a mass of .