AM 1316-241, otherwise known as ESO 508-45, is the collective name of two interacting galaxies, found approximately 400 million light-years from Earth in the constellation of Hydra. On the left, we have a spiral galaxy, and an elliptical stands on the right—the latter illuminates the foreground galaxy, bringing many subtle details to light. I couldn’t find many details online (and by that, I mean basically nothing), so here’s what NASA has to say about them:
The starlight from the background galaxy is partially obscured by the bands and filaments of dust associated with the foreground spiral galaxy. The Hubble image unravels the fine detail in the patchy clumps of dust confined to the spiral arms of the spiral galaxy. This dust reddens the light from the background just as the intervening dust in the Earth’s atmosphere reddens sunsets here. AM1316-241 is located some 400 million light-years away toward the constellation of Hydra, the Water Snake.
This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on the occasion of its 18th anniversary on 24th April 2008.
[Reference: Hubble Site]
See a larger image here.