Seyfert's Sextet

Explanation: Known as Seyfert's Sextet , this intriguing group of galaxies lies in the head portion of the split constellation Serpens . The sextet actually contains only four interacting galaxies, though. Near the center of this Hubble Space Telescope picture , the small face-on spiral galaxy lies in the distant background and appears only by chance aligned with the main group. Also, the prominent condensation on the far right is likely not a separate galaxy at all, but a tidal tail of stars flung out by the galaxies' gravitational interactions. About 190 million light-years away, the interacting galaxies are tightly packed into a region around 100,000 light-years across, comparable to the size of our own Milky Way galaxy , making this one of the densest known galaxy groups . Bound by gravity, the close-knit group may coalesce into a single large galaxy over the next few billion years.