I enjoy creating color images from three grayscale images. The post linked here will explain how to create color astronomical images. The colors assigned are not necessarily what the human eye would see, but are used to bring out details. Visit the gallery of previous Astro-Images.
This is the central portion of a larger galaxy. Visible features of note include the spiral shape, the dark tenuous dust lanes in the ring shape, a brightly glowing core due to the emission of many stars, and a central bar crossing the ring shape. Central bars are a common feature in many galaxies as this Google Images result can attest. A much wider view of NGC 1398 is available from Adam Block, Mount Lemmon SkyCenter/University of Arizona.
William Herschel discovered this galaxy in 1834. It lies about 50 million light years away in the constellation Volans. It is commonly known as the Meathook because one of the spiral arms is extended while the other is quite small. This image is from an Astronomy Picture of the Day post on 15 March 2007. Click to embiggen the image and read the APoD description.
I used Hubble images to make this one below. It is zoomed in to the galaxy with the meathook arm extending upward the same as in the APoD image above. At the top edge of the frame is a bright star. In March of 2015, a supernova was discovered just to the right of that glowing star. It does not show in this image.
A series of images was made of the supernova by the Lee Sang Gak Telescope at Siding Spring Observatory in Australia. They were placed into a video sequence to show the rise and fall of the light output of the supernova known as SN 2015F. Between March and June 2015, it rose in brightness, then faded the way of a typical supernova.