Hubble Space Telescope image of Arp 6, also known as NGC 2537 or the Bear’s Paw Galaxy.

It has a nucleus that is rapidly forming stars, surrounded by a horseshoe-shaped structure, also forming new stars.

Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt
https://www.flickr.com/photos/geckzilla/46842339755