Hubble image of Arp 220, also known as IC 4553.
Arp 220 is the aftermath of a collision between two spiral galaxies. The collision set off a burst of star formation, creating star clusters seen as bluish-white bright knots in this image.
This image is part of a collection of 59 images of merging galaxies released to celebrate Hubble's 18th anniversary in 2008.
Credit: NASA, ESA, STScI, A. Evans
Source: https://science.nasa.gov/asset/hubble/hubble-interacting-galaxy-arp-220/