Hubble Observes an Askew Galaxy Coaxing Star Formation from its Partner  – NASA Science

Arp 300 consists of two interacting galaxies, UGC 05028 (the smaller face-on spiral galaxy) and UGC 05029 (the larger face-on spiral). Likely due to its gravitational dance with its larger partner, UGC 05028 has an asymmetric, irregular structure, which is not as visible from ground-based telescopes but is quite distinct in this new image from NASA’s Hubble Space Telescope. The bright knot visible to the southeast of the center of UGC 05028 may be the remnant of another small galaxy that is in the process of merging with that galaxy. If this is the case, that remnant will eventually merge with the bar of stars visible in Hubble images of UGC 05028, forming a central bulge similar to that of Arp 300’s larger companion galaxy, UGC 05029.